* [patch 01/69] mm/migrate.c: rework migration_entry_wait() to not take a pageref
2022-01-22 6:10 incoming Andrew Morton
@ 2022-01-22 6:10 ` Andrew Morton
2022-01-22 6:10 ` [patch 02/69] sysctl: add a new register_sysctl_init() interface Andrew Morton
` (67 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:10 UTC (permalink / raw)
To: akpm, apopple, david, dhowells, hughd, jgg, jglisse, jhubbard,
linux-mm, mm-commits, rcampbell, torvalds, willy
From: Alistair Popple <apopple@nvidia.com>
Subject: mm/migrate.c: rework migration_entry_wait() to not take a pageref
This fixes the FIXME in migrate_vma_check_page().
Before migrating a page migration code will take a reference and check
there are no unexpected page references, failing the migration if there
are. When a thread faults on a migration entry it will take a temporary
reference to the page to wait for the page to become unlocked signifying
the migration entry has been removed.
This reference is dropped just prior to waiting on the page lock, however
the extra reference can cause migration failures so it is desirable to
avoid taking it.
As migration code already has a reference to the migrating page an extra
reference to wait on PG_locked is unnecessary so long as the reference
can't be dropped whilst setting up the wait.
When faulting on a migration entry the ptl is taken to check the migration
entry. Removing a migration entry also requires the ptl, and migration
code won't drop its page reference until after the migration entry has
been removed. Therefore retaining the ptl of a migration entry is
sufficient to ensure the page has a reference. Reworking
migration_entry_wait() to hold the ptl until the wait setup is complete
means the extra page reference is no longer needed.
[apopple@nvidia.com: v5]
Link: https://lkml.kernel.org/r/20211213033848.1973946-1-apopple@nvidia.com
Link: https://lkml.kernel.org/r/20211118020754.954425-1-apopple@nvidia.com
Signed-off-by: Alistair Popple <apopple@nvidia.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/migrate.h | 2
mm/filemap.c | 91 ++++++++++++++++++++++++++++++++++++++
mm/migrate.c | 38 +--------------
3 files changed, 97 insertions(+), 34 deletions(-)
--- a/include/linux/migrate.h~mm-migratec-rework-migration_entry_wait-to-not-take-a-pageref
+++ a/include/linux/migrate.h
@@ -40,6 +40,8 @@ extern int migrate_huge_page_move_mappin
struct page *newpage, struct page *page);
extern int migrate_page_move_mapping(struct address_space *mapping,
struct page *newpage, struct page *page, int extra_count);
+void migration_entry_wait_on_locked(swp_entry_t entry, pte_t *ptep,
+ spinlock_t *ptl);
void folio_migrate_flags(struct folio *newfolio, struct folio *folio);
void folio_migrate_copy(struct folio *newfolio, struct folio *folio);
int folio_migrate_mapping(struct address_space *mapping,
--- a/mm/filemap.c~mm-migratec-rework-migration_entry_wait-to-not-take-a-pageref
+++ a/mm/filemap.c
@@ -21,6 +21,7 @@
#include <linux/gfp.h>
#include <linux/mm.h>
#include <linux/swap.h>
+#include <linux/swapops.h>
#include <linux/mman.h>
#include <linux/pagemap.h>
#include <linux/file.h>
@@ -41,6 +42,7 @@
#include <linux/psi.h>
#include <linux/ramfs.h>
#include <linux/page_idle.h>
+#include <linux/migrate.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
#include "internal.h"
@@ -1388,6 +1390,95 @@ repeat:
return wait->flags & WQ_FLAG_WOKEN ? 0 : -EINTR;
}
+#ifdef CONFIG_MIGRATION
+/**
+ * migration_entry_wait_on_locked - Wait for a migration entry to be removed
+ * @entry: migration swap entry.
+ * @ptep: mapped pte pointer. Will return with the ptep unmapped. Only required
+ * for pte entries, pass NULL for pmd entries.
+ * @ptl: already locked ptl. This function will drop the lock.
+ *
+ * Wait for a migration entry referencing the given page to be removed. This is
+ * equivalent to put_and_wait_on_page_locked(page, TASK_UNINTERRUPTIBLE) except
+ * this can be called without taking a reference on the page. Instead this
+ * should be called while holding the ptl for the migration entry referencing
+ * the page.
+ *
+ * Returns after unmapping and unlocking the pte/ptl with pte_unmap_unlock().
+ *
+ * This follows the same logic as folio_wait_bit_common() so see the comments
+ * there.
+ */
+void migration_entry_wait_on_locked(swp_entry_t entry, pte_t *ptep,
+ spinlock_t *ptl)
+{
+ struct wait_page_queue wait_page;
+ wait_queue_entry_t *wait = &wait_page.wait;
+ bool thrashing = false;
+ bool delayacct = false;
+ unsigned long pflags;
+ wait_queue_head_t *q;
+ struct folio *folio = page_folio(pfn_swap_entry_to_page(entry));
+
+ q = folio_waitqueue(folio);
+ if (!folio_test_uptodate(folio) && folio_test_workingset(folio)) {
+ if (!folio_test_swapbacked(folio)) {
+ delayacct_thrashing_start();
+ delayacct = true;
+ }
+ psi_memstall_enter(&pflags);
+ thrashing = true;
+ }
+
+ init_wait(wait);
+ wait->func = wake_page_function;
+ wait_page.folio = folio;
+ wait_page.bit_nr = PG_locked;
+ wait->flags = 0;
+
+ spin_lock_irq(&q->lock);
+ folio_set_waiters(folio);
+ if (!folio_trylock_flag(folio, PG_locked, wait))
+ __add_wait_queue_entry_tail(q, wait);
+ spin_unlock_irq(&q->lock);
+
+ /*
+ * If a migration entry exists for the page the migration path must hold
+ * a valid reference to the page, and it must take the ptl to remove the
+ * migration entry. So the page is valid until the ptl is dropped.
+ */
+ if (ptep)
+ pte_unmap_unlock(ptep, ptl);
+ else
+ spin_unlock(ptl);
+
+ for (;;) {
+ unsigned int flags;
+
+ set_current_state(TASK_UNINTERRUPTIBLE);
+
+ /* Loop until we've been woken or interrupted */
+ flags = smp_load_acquire(&wait->flags);
+ if (!(flags & WQ_FLAG_WOKEN)) {
+ if (signal_pending_state(TASK_UNINTERRUPTIBLE, current))
+ break;
+
+ io_schedule();
+ continue;
+ }
+ break;
+ }
+
+ finish_wait(q, wait);
+
+ if (thrashing) {
+ if (delayacct)
+ delayacct_thrashing_end();
+ psi_memstall_leave(&pflags);
+ }
+}
+#endif
+
void folio_wait_bit(struct folio *folio, int bit_nr)
{
folio_wait_bit_common(folio, bit_nr, TASK_UNINTERRUPTIBLE, SHARED);
--- a/mm/migrate.c~mm-migratec-rework-migration_entry_wait-to-not-take-a-pageref
+++ a/mm/migrate.c
@@ -291,7 +291,6 @@ void __migration_entry_wait(struct mm_st
{
pte_t pte;
swp_entry_t entry;
- struct folio *folio;
spin_lock(ptl);
pte = *ptep;
@@ -302,17 +301,7 @@ void __migration_entry_wait(struct mm_st
if (!is_migration_entry(entry))
goto out;
- folio = page_folio(pfn_swap_entry_to_page(entry));
-
- /*
- * Once page cache replacement of page migration started, page_count
- * is zero; but we must not call folio_put_wait_locked() without
- * a ref. Use folio_try_get(), and just fault again if it fails.
- */
- if (!folio_try_get(folio))
- goto out;
- pte_unmap_unlock(ptep, ptl);
- folio_put_wait_locked(folio, TASK_UNINTERRUPTIBLE);
+ migration_entry_wait_on_locked(entry, ptep, ptl);
return;
out:
pte_unmap_unlock(ptep, ptl);
@@ -337,16 +326,11 @@ void migration_entry_wait_huge(struct vm
void pmd_migration_entry_wait(struct mm_struct *mm, pmd_t *pmd)
{
spinlock_t *ptl;
- struct folio *folio;
ptl = pmd_lock(mm, pmd);
if (!is_pmd_migration_entry(*pmd))
goto unlock;
- folio = page_folio(pfn_swap_entry_to_page(pmd_to_swp_entry(*pmd)));
- if (!folio_try_get(folio))
- goto unlock;
- spin_unlock(ptl);
- folio_put_wait_locked(folio, TASK_UNINTERRUPTIBLE);
+ migration_entry_wait_on_locked(pmd_to_swp_entry(*pmd), NULL, ptl);
return;
unlock:
spin_unlock(ptl);
@@ -2431,22 +2415,8 @@ static bool migrate_vma_check_page(struc
return false;
/* Page from ZONE_DEVICE have one extra reference */
- if (is_zone_device_page(page)) {
- /*
- * Private page can never be pin as they have no valid pte and
- * GUP will fail for those. Yet if there is a pending migration
- * a thread might try to wait on the pte migration entry and
- * will bump the page reference count. Sadly there is no way to
- * differentiate a regular pin from migration wait. Hence to
- * avoid 2 racing thread trying to migrate back to CPU to enter
- * infinite loop (one stopping migration because the other is
- * waiting on pte migration entry). We always return true here.
- *
- * FIXME proper solution is to rework migration_entry_wait() so
- * it does not need to take a reference on page.
- */
- return is_device_private_page(page);
- }
+ if (is_zone_device_page(page))
+ extra++;
/* For file back page */
if (page_mapping(page))
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 02/69] sysctl: add a new register_sysctl_init() interface
2022-01-22 6:10 incoming Andrew Morton
2022-01-22 6:10 ` [patch 01/69] mm/migrate.c: rework migration_entry_wait() to not take a pageref Andrew Morton
@ 2022-01-22 6:10 ` Andrew Morton
2022-01-22 6:10 ` [patch 03/69] sysctl: move some boundary constants from sysctl.c to sysctl_vals Andrew Morton
` (66 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:10 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: sysctl: add a new register_sysctl_init() interface
Patch series "sysctl: first set of kernel/sysctl cleanups", v2.
Finally had time to respin the series of the work we had started last year
on cleaning up the kernel/sysct.c kitchen sink. People keeps stuffing
their sysctls in that file and this creates a maintenance burden. So this
effort is aimed at placing sysctls where they actually belong.
I'm going to split patches up into series as there is quite a bit of work.
This first set adds register_sysctl_init() for uses of registerting a
sysctl on the init path, adds const where missing to a few places,
generalizes common values so to be more easy to share, and starts the move
of a few kernel/sysctl.c out where they belong.
The majority of rework on v2 in this first patch set is 0-day fixes. Eric
W. Biederman's feedback is later addressed in subsequent patch sets.
I'll only post the first two patch sets for now. We can address the rest
once the first two patch sets get completely reviewed / Acked.
This patch (of 9):
The kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
Today though folks heavily rely on tables on kernel/sysctl.c so they can
easily just extend this table with their needed sysctls. In order to help
users move their sysctls out we need to provide a helper which can be used
during code initialization.
We special-case the initialization use of register_sysctl() since it *is*
safe to fail, given all that sysctls do is provide a dynamic interface to
query or modify at runtime an existing variable. So the use case of
register_sysctl() on init should *not* stop if the sysctls don't end up
getting registered. It would be counter productive to stop boot if a
simple sysctl registration failed.
Provide a helper for init then, and document the recommended init levels
to use for callers of this routine. We will later use this in subsequent
patches to start slimming down kernel/sysctl.c tables and moving sysctl
registration to the code which actually needs these sysctls.
[mcgrof@kernel.org: major commit log and documentation rephrasing also moved to fs/proc/proc_sysctl.c ]
Link: https://lkml.kernel.org/r/20211123202347.818157-1-mcgrof@kernel.org
Link: https://lkml.kernel.org/r/20211123202347.818157-2-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Paul Turner <pjt@google.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Jan Kara <jack@suse.cz>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/proc/proc_sysctl.c | 33 +++++++++++++++++++++++++++++++++
include/linux/sysctl.h | 3 +++
2 files changed, 36 insertions(+)
--- a/fs/proc/proc_sysctl.c~sysctl-add-a-new-register_sysctl_init-interface
+++ a/fs/proc/proc_sysctl.c
@@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/bpf-cgroup.h>
#include <linux/mount.h>
+#include <linux/kmemleak.h>
#include "internal.h"
static const struct dentry_operations proc_sys_dentry_operations;
@@ -1383,6 +1384,38 @@ struct ctl_table_header *register_sysctl
}
EXPORT_SYMBOL(register_sysctl);
+/**
+ * __register_sysctl_init() - register sysctl table to path
+ * @path: path name for sysctl base
+ * @table: This is the sysctl table that needs to be registered to the path
+ * @table_name: The name of sysctl table, only used for log printing when
+ * registration fails
+ *
+ * The sysctl interface is used by userspace to query or modify at runtime
+ * a predefined value set on a variable. These variables however have default
+ * values pre-set. Code which depends on these variables will always work even
+ * if register_sysctl() fails. If register_sysctl() fails you'd just loose the
+ * ability to query or modify the sysctls dynamically at run time. Chances of
+ * register_sysctl() failing on init are extremely low, and so for both reasons
+ * this function does not return any error as it is used by initialization code.
+ *
+ * Context: Can only be called after your respective sysctl base path has been
+ * registered. So for instance, most base directories are registered early on
+ * init before init levels are processed through proc_sys_init() and
+ * sysctl_init().
+ */
+void __init __register_sysctl_init(const char *path, struct ctl_table *table,
+ const char *table_name)
+{
+ struct ctl_table_header *hdr = register_sysctl(path, table);
+
+ if (unlikely(!hdr)) {
+ pr_err("failed when register_sysctl %s to %s\n", table_name, path);
+ return;
+ }
+ kmemleak_not_leak(hdr);
+}
+
static char *append_path(const char *path, char *pos, const char *name)
{
int namelen;
--- a/include/linux/sysctl.h~sysctl-add-a-new-register_sysctl_init-interface
+++ a/include/linux/sysctl.h
@@ -199,6 +199,9 @@ struct ctl_table_header *register_sysctl
void unregister_sysctl_table(struct ctl_table_header * table);
extern int sysctl_init(void);
+extern void __register_sysctl_init(const char *path, struct ctl_table *table,
+ const char *table_name);
+#define register_sysctl_init(path, table) __register_sysctl_init(path, table, #table)
void do_sysctl_args(void);
extern int pwrsw_enabled;
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 03/69] sysctl: move some boundary constants from sysctl.c to sysctl_vals
2022-01-22 6:10 incoming Andrew Morton
2022-01-22 6:10 ` [patch 01/69] mm/migrate.c: rework migration_entry_wait() to not take a pageref Andrew Morton
2022-01-22 6:10 ` [patch 02/69] sysctl: add a new register_sysctl_init() interface Andrew Morton
@ 2022-01-22 6:10 ` Andrew Morton
2022-01-22 6:11 ` [patch 04/69] hung_task: move hung_task sysctl interface to hung_task.c Andrew Morton
` (65 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:10 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: sysctl: move some boundary constants from sysctl.c to sysctl_vals
sysctl has helpers which let us specify boundary values for a min or max
int value. Since these are used for a boundary check only they don't
change, so move these variables to sysctl_vals to avoid adding duplicate
variables. This will help with our cleanup of kernel/sysctl.c.
[akpm@linux-foundation.org: update it for "mm/pagealloc: sysctl: change watermark_scale_factor max limit to 30%"]
[mcgrof@kernel.org: major rebase]
Link: https://lkml.kernel.org/r/20211123202347.818157-3-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/proc/proc_sysctl.c | 2 -
include/linux/sysctl.h | 13 ++++++++---
kernel/sysctl.c | 45 ++++++++++++++++-----------------------
3 files changed, 30 insertions(+), 30 deletions(-)
--- a/fs/proc/proc_sysctl.c~sysctl-move-some-boundary-constants-from-sysctlc-to-sysctl_vals
+++ a/fs/proc/proc_sysctl.c
@@ -26,7 +26,7 @@ static const struct file_operations proc
static const struct inode_operations proc_sys_dir_operations;
/* shared constants to be used in various sysctls */
-const int sysctl_vals[] = { 0, 1, INT_MAX };
+const int sysctl_vals[] = { -1, 0, 1, 2, 4, 100, 200, 1000, 3000, INT_MAX };
EXPORT_SYMBOL(sysctl_vals);
/* Support for permanently empty directories */
--- a/include/linux/sysctl.h~sysctl-move-some-boundary-constants-from-sysctlc-to-sysctl_vals
+++ a/include/linux/sysctl.h
@@ -38,9 +38,16 @@ struct ctl_table_header;
struct ctl_dir;
/* Keep the same order as in fs/proc/proc_sysctl.c */
-#define SYSCTL_ZERO ((void *)&sysctl_vals[0])
-#define SYSCTL_ONE ((void *)&sysctl_vals[1])
-#define SYSCTL_INT_MAX ((void *)&sysctl_vals[2])
+#define SYSCTL_NEG_ONE ((void *)&sysctl_vals[0])
+#define SYSCTL_ZERO ((void *)&sysctl_vals[1])
+#define SYSCTL_ONE ((void *)&sysctl_vals[2])
+#define SYSCTL_TWO ((void *)&sysctl_vals[3])
+#define SYSCTL_FOUR ((void *)&sysctl_vals[4])
+#define SYSCTL_ONE_HUNDRED ((void *)&sysctl_vals[5])
+#define SYSCTL_TWO_HUNDRED ((void *)&sysctl_vals[6])
+#define SYSCTL_ONE_THOUSAND ((void *)&sysctl_vals[7])
+#define SYSCTL_THREE_THOUSAND ((void *)&sysctl_vals[8])
+#define SYSCTL_INT_MAX ((void *)&sysctl_vals[9])
extern const int sysctl_vals[];
--- a/kernel/sysctl.c~sysctl-move-some-boundary-constants-from-sysctlc-to-sysctl_vals
+++ a/kernel/sysctl.c
@@ -114,16 +114,9 @@
static int sixty = 60;
#endif
-static int __maybe_unused neg_one = -1;
-static int __maybe_unused two = 2;
-static int __maybe_unused four = 4;
static unsigned long zero_ul;
static unsigned long one_ul = 1;
static unsigned long long_max = LONG_MAX;
-static int one_hundred = 100;
-static int two_hundred = 200;
-static int one_thousand = 1000;
-static int three_thousand = 3000;
#ifdef CONFIG_PRINTK
static int ten_thousand = 10000;
#endif
@@ -1964,7 +1957,7 @@ static struct ctl_table kern_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = &neg_one,
+ .extra1 = SYSCTL_NEG_ONE,
.extra2 = SYSCTL_ONE,
},
#endif
@@ -2306,7 +2299,7 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_minmax_sysadmin,
.extra1 = SYSCTL_ZERO,
- .extra2 = &two,
+ .extra2 = SYSCTL_TWO,
},
#endif
{
@@ -2566,7 +2559,7 @@ static struct ctl_table kern_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = &neg_one,
+ .extra1 = SYSCTL_NEG_ONE,
},
#endif
#ifdef CONFIG_RT_MUTEXES
@@ -2628,7 +2621,7 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = perf_cpu_time_max_percent_handler,
.extra1 = SYSCTL_ZERO,
- .extra2 = &one_hundred,
+ .extra2 = SYSCTL_ONE_HUNDRED,
},
{
.procname = "perf_event_max_stack",
@@ -2646,7 +2639,7 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = perf_event_max_stack_handler,
.extra1 = SYSCTL_ZERO,
- .extra2 = &one_thousand,
+ .extra2 = SYSCTL_ONE_THOUSAND,
},
#endif
{
@@ -2677,7 +2670,7 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = bpf_unpriv_handler,
.extra1 = SYSCTL_ZERO,
- .extra2 = &two,
+ .extra2 = SYSCTL_TWO,
},
{
.procname = "bpf_stats_enabled",
@@ -2731,7 +2724,7 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = overcommit_policy_handler,
.extra1 = SYSCTL_ZERO,
- .extra2 = &two,
+ .extra2 = SYSCTL_TWO,
},
{
.procname = "panic_on_oom",
@@ -2740,7 +2733,7 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
- .extra2 = &two,
+ .extra2 = SYSCTL_TWO,
},
{
.procname = "oom_kill_allocating_task",
@@ -2785,7 +2778,7 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = dirty_background_ratio_handler,
.extra1 = SYSCTL_ZERO,
- .extra2 = &one_hundred,
+ .extra2 = SYSCTL_ONE_HUNDRED,
},
{
.procname = "dirty_background_bytes",
@@ -2802,7 +2795,7 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = dirty_ratio_handler,
.extra1 = SYSCTL_ZERO,
- .extra2 = &one_hundred,
+ .extra2 = SYSCTL_ONE_HUNDRED,
},
{
.procname = "dirty_bytes",
@@ -2842,7 +2835,7 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
- .extra2 = &two_hundred,
+ .extra2 = SYSCTL_TWO_HUNDRED,
},
#ifdef CONFIG_HUGETLB_PAGE
{
@@ -2899,7 +2892,7 @@ static struct ctl_table vm_table[] = {
.mode = 0200,
.proc_handler = drop_caches_sysctl_handler,
.extra1 = SYSCTL_ONE,
- .extra2 = &four,
+ .extra2 = SYSCTL_FOUR,
},
#ifdef CONFIG_COMPACTION
{
@@ -2916,7 +2909,7 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = compaction_proactiveness_sysctl_handler,
.extra1 = SYSCTL_ZERO,
- .extra2 = &one_hundred,
+ .extra2 = SYSCTL_ONE_HUNDRED,
},
{
.procname = "extfrag_threshold",
@@ -2961,7 +2954,7 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = watermark_scale_factor_sysctl_handler,
.extra1 = SYSCTL_ONE,
- .extra2 = &three_thousand,
+ .extra2 = SYSCTL_THREE_THOUSAND,
},
{
.procname = "percpu_pagelist_high_fraction",
@@ -3040,7 +3033,7 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
.extra1 = SYSCTL_ZERO,
- .extra2 = &one_hundred,
+ .extra2 = SYSCTL_ONE_HUNDRED,
},
{
.procname = "min_slab_ratio",
@@ -3049,7 +3042,7 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = sysctl_min_slab_ratio_sysctl_handler,
.extra1 = SYSCTL_ZERO,
- .extra2 = &one_hundred,
+ .extra2 = SYSCTL_ONE_HUNDRED,
},
#endif
#ifdef CONFIG_SMP
@@ -3339,7 +3332,7 @@ static struct ctl_table fs_table[] = {
.mode = 0600,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
- .extra2 = &two,
+ .extra2 = SYSCTL_TWO,
},
{
.procname = "protected_regular",
@@ -3348,7 +3341,7 @@ static struct ctl_table fs_table[] = {
.mode = 0600,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
- .extra2 = &two,
+ .extra2 = SYSCTL_TWO,
},
{
.procname = "suid_dumpable",
@@ -3357,7 +3350,7 @@ static struct ctl_table fs_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_minmax_coredump,
.extra1 = SYSCTL_ZERO,
- .extra2 = &two,
+ .extra2 = SYSCTL_TWO,
},
#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
{
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 04/69] hung_task: move hung_task sysctl interface to hung_task.c
2022-01-22 6:10 incoming Andrew Morton
` (2 preceding siblings ...)
2022-01-22 6:10 ` [patch 03/69] sysctl: move some boundary constants from sysctl.c to sysctl_vals Andrew Morton
@ 2022-01-22 6:11 ` Andrew Morton
2022-01-22 6:11 ` [patch 05/69] watchdog: move watchdog sysctl interface to watchdog.c Andrew Morton
` (64 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:11 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: hung_task: move hung_task sysctl interface to hung_task.c
The kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
So move hung_task sysctl interface to hung_task.c and use
register_sysctl() to register the sysctl interface.
[mcgrof@kernel.org: commit log refresh and fixed 2-3 0day reported compile issues]
Link: https://lkml.kernel.org/r/20211123202347.818157-4-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/sched/sysctl.h | 14 -----
kernel/hung_task.c | 81 +++++++++++++++++++++++++++++++--
kernel/sysctl.c | 61 ------------------------
3 files changed, 79 insertions(+), 77 deletions(-)
--- a/include/linux/sched/sysctl.h~hung_task-move-hung_task-sysctl-interface-to-hung_taskc
+++ a/include/linux/sched/sysctl.h
@@ -7,20 +7,8 @@
struct ctl_table;
#ifdef CONFIG_DETECT_HUNG_TASK
-
-#ifdef CONFIG_SMP
-extern unsigned int sysctl_hung_task_all_cpu_backtrace;
-#else
-#define sysctl_hung_task_all_cpu_backtrace 0
-#endif /* CONFIG_SMP */
-
-extern int sysctl_hung_task_check_count;
-extern unsigned int sysctl_hung_task_panic;
+/* used for hung_task and block/ */
extern unsigned long sysctl_hung_task_timeout_secs;
-extern unsigned long sysctl_hung_task_check_interval_secs;
-extern int sysctl_hung_task_warnings;
-int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos);
#else
/* Avoid need for ifdefs elsewhere in the code */
enum { sysctl_hung_task_timeout_secs = 0 };
--- a/kernel/hung_task.c~hung_task-move-hung_task-sysctl-interface-to-hung_taskc
+++ a/kernel/hung_task.c
@@ -63,7 +63,9 @@ static struct task_struct *watchdog_task
* Should we dump all CPUs backtraces in a hung task event?
* Defaults to 0, can be changed via sysctl.
*/
-unsigned int __read_mostly sysctl_hung_task_all_cpu_backtrace;
+static unsigned int __read_mostly sysctl_hung_task_all_cpu_backtrace;
+#else
+#define sysctl_hung_task_all_cpu_backtrace 0
#endif /* CONFIG_SMP */
/*
@@ -222,11 +224,13 @@ static long hung_timeout_jiffies(unsigne
MAX_SCHEDULE_TIMEOUT;
}
+#ifdef CONFIG_SYSCTL
/*
* Process updating of timeout sysctl
*/
-int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
+static int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
+ void __user *buffer,
+ size_t *lenp, loff_t *ppos)
{
int ret;
@@ -241,6 +245,76 @@ int proc_dohung_task_timeout_secs(struct
return ret;
}
+/*
+ * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
+ * and hung_task_check_interval_secs
+ */
+static const unsigned long hung_task_timeout_max = (LONG_MAX / HZ);
+static struct ctl_table hung_task_sysctls[] = {
+#ifdef CONFIG_SMP
+ {
+ .procname = "hung_task_all_cpu_backtrace",
+ .data = &sysctl_hung_task_all_cpu_backtrace,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+#endif /* CONFIG_SMP */
+ {
+ .procname = "hung_task_panic",
+ .data = &sysctl_hung_task_panic,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+ {
+ .procname = "hung_task_check_count",
+ .data = &sysctl_hung_task_check_count,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ },
+ {
+ .procname = "hung_task_timeout_secs",
+ .data = &sysctl_hung_task_timeout_secs,
+ .maxlen = sizeof(unsigned long),
+ .mode = 0644,
+ .proc_handler = proc_dohung_task_timeout_secs,
+ .extra2 = (void *)&hung_task_timeout_max,
+ },
+ {
+ .procname = "hung_task_check_interval_secs",
+ .data = &sysctl_hung_task_check_interval_secs,
+ .maxlen = sizeof(unsigned long),
+ .mode = 0644,
+ .proc_handler = proc_dohung_task_timeout_secs,
+ .extra2 = (void *)&hung_task_timeout_max,
+ },
+ {
+ .procname = "hung_task_warnings",
+ .data = &sysctl_hung_task_warnings,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_NEG_ONE,
+ },
+ {}
+};
+
+static void __init hung_task_sysctl_init(void)
+{
+ register_sysctl_init("kernel", hung_task_sysctls);
+}
+#else
+#define hung_task_sysctl_init() do { } while (0)
+#endif /* CONFIG_SYSCTL */
+
+
static atomic_t reset_hung_task = ATOMIC_INIT(0);
void reset_hung_task_detector(void)
@@ -310,6 +384,7 @@ static int __init hung_task_init(void)
pm_notifier(hungtask_pm_notify, 0);
watchdog_task = kthread_run(watchdog, NULL, "khungtaskd");
+ hung_task_sysctl_init();
return 0;
}
--- a/kernel/sysctl.c~hung_task-move-hung_task-sysctl-interface-to-hung_taskc
+++ a/kernel/sysctl.c
@@ -134,13 +134,6 @@ static int minolduid;
static int ngroups_max = NGROUPS_MAX;
static const int cap_last_cap = CAP_LAST_CAP;
-/*
- * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
- * and hung_task_check_interval_secs
- */
-#ifdef CONFIG_DETECT_HUNG_TASK
-static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
-#endif
#ifdef CONFIG_INOTIFY_USER
#include <linux/inotify.h>
@@ -2508,60 +2501,6 @@ static struct ctl_table kern_table[] = {
.proc_handler = proc_dointvec,
},
#endif
-#ifdef CONFIG_DETECT_HUNG_TASK
-#ifdef CONFIG_SMP
- {
- .procname = "hung_task_all_cpu_backtrace",
- .data = &sysctl_hung_task_all_cpu_backtrace,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
-#endif /* CONFIG_SMP */
- {
- .procname = "hung_task_panic",
- .data = &sysctl_hung_task_panic,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- {
- .procname = "hung_task_check_count",
- .data = &sysctl_hung_task_check_count,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- },
- {
- .procname = "hung_task_timeout_secs",
- .data = &sysctl_hung_task_timeout_secs,
- .maxlen = sizeof(unsigned long),
- .mode = 0644,
- .proc_handler = proc_dohung_task_timeout_secs,
- .extra2 = &hung_task_timeout_max,
- },
- {
- .procname = "hung_task_check_interval_secs",
- .data = &sysctl_hung_task_check_interval_secs,
- .maxlen = sizeof(unsigned long),
- .mode = 0644,
- .proc_handler = proc_dohung_task_timeout_secs,
- .extra2 = &hung_task_timeout_max,
- },
- {
- .procname = "hung_task_warnings",
- .data = &sysctl_hung_task_warnings,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_NEG_ONE,
- },
-#endif
#ifdef CONFIG_RT_MUTEXES
{
.procname = "max_lock_depth",
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 05/69] watchdog: move watchdog sysctl interface to watchdog.c
2022-01-22 6:10 incoming Andrew Morton
` (3 preceding siblings ...)
2022-01-22 6:11 ` [patch 04/69] hung_task: move hung_task sysctl interface to hung_task.c Andrew Morton
@ 2022-01-22 6:11 ` Andrew Morton
2022-01-22 6:11 ` [patch 06/69] sysctl: make ngroups_max const Andrew Morton
` (63 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:11 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: watchdog: move watchdog sysctl interface to watchdog.c
The kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic of proc sysctl.
So, move the watchdog syscl interface to watchdog.c. Use
register_sysctl() to register the sysctl interface to avoid merge
conflicts when different features modify sysctl.c at the same time.
[mcgrof@kernel.org: justify the move on the commit log]
Link: https://lkml.kernel.org/r/20211123202347.818157-5-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
kernel/sysctl.c | 96 -----------------------------------------
kernel/watchdog.c | 101 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 101 insertions(+), 96 deletions(-)
--- a/kernel/sysctl.c~watchdog-move-watchdog-sysctl-interface-to-watchdogc
+++ a/kernel/sysctl.c
@@ -103,16 +103,10 @@
#ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
#include <linux/stackleak.h>
#endif
-#ifdef CONFIG_LOCKUP_DETECTOR
-#include <linux/nmi.h>
-#endif
#if defined(CONFIG_SYSCTL)
/* Constants used for minimum and maximum */
-#ifdef CONFIG_LOCKUP_DETECTOR
-static int sixty = 60;
-#endif
static unsigned long zero_ul;
static unsigned long one_ul = 1;
@@ -2309,96 +2303,6 @@ static struct ctl_table kern_table[] = {
.mode = 0444,
.proc_handler = proc_dointvec,
},
-#if defined(CONFIG_LOCKUP_DETECTOR)
- {
- .procname = "watchdog",
- .data = &watchdog_user_enabled,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_watchdog,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- {
- .procname = "watchdog_thresh",
- .data = &watchdog_thresh,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_watchdog_thresh,
- .extra1 = SYSCTL_ZERO,
- .extra2 = &sixty,
- },
- {
- .procname = "nmi_watchdog",
- .data = &nmi_watchdog_user_enabled,
- .maxlen = sizeof(int),
- .mode = NMI_WATCHDOG_SYSCTL_PERM,
- .proc_handler = proc_nmi_watchdog,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- {
- .procname = "watchdog_cpumask",
- .data = &watchdog_cpumask_bits,
- .maxlen = NR_CPUS,
- .mode = 0644,
- .proc_handler = proc_watchdog_cpumask,
- },
-#ifdef CONFIG_SOFTLOCKUP_DETECTOR
- {
- .procname = "soft_watchdog",
- .data = &soft_watchdog_user_enabled,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_soft_watchdog,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- {
- .procname = "softlockup_panic",
- .data = &softlockup_panic,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
-#ifdef CONFIG_SMP
- {
- .procname = "softlockup_all_cpu_backtrace",
- .data = &sysctl_softlockup_all_cpu_backtrace,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
-#endif /* CONFIG_SMP */
-#endif
-#ifdef CONFIG_HARDLOCKUP_DETECTOR
- {
- .procname = "hardlockup_panic",
- .data = &hardlockup_panic,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
-#ifdef CONFIG_SMP
- {
- .procname = "hardlockup_all_cpu_backtrace",
- .data = &sysctl_hardlockup_all_cpu_backtrace,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
-#endif /* CONFIG_SMP */
-#endif
-#endif
-
#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
{
.procname = "unknown_nmi_panic",
--- a/kernel/watchdog.c~watchdog-move-watchdog-sysctl-interface-to-watchdogc
+++ a/kernel/watchdog.c
@@ -740,6 +740,106 @@ int proc_watchdog_cpumask(struct ctl_tab
mutex_unlock(&watchdog_mutex);
return err;
}
+
+static const int sixty = 60;
+
+static struct ctl_table watchdog_sysctls[] = {
+ {
+ .procname = "watchdog",
+ .data = &watchdog_user_enabled,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_watchdog,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+ {
+ .procname = "watchdog_thresh",
+ .data = &watchdog_thresh,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_watchdog_thresh,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = (void *)&sixty,
+ },
+ {
+ .procname = "nmi_watchdog",
+ .data = &nmi_watchdog_user_enabled,
+ .maxlen = sizeof(int),
+ .mode = NMI_WATCHDOG_SYSCTL_PERM,
+ .proc_handler = proc_nmi_watchdog,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+ {
+ .procname = "watchdog_cpumask",
+ .data = &watchdog_cpumask_bits,
+ .maxlen = NR_CPUS,
+ .mode = 0644,
+ .proc_handler = proc_watchdog_cpumask,
+ },
+#ifdef CONFIG_SOFTLOCKUP_DETECTOR
+ {
+ .procname = "soft_watchdog",
+ .data = &soft_watchdog_user_enabled,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_soft_watchdog,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+ {
+ .procname = "softlockup_panic",
+ .data = &softlockup_panic,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+#ifdef CONFIG_SMP
+ {
+ .procname = "softlockup_all_cpu_backtrace",
+ .data = &sysctl_softlockup_all_cpu_backtrace,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+#endif /* CONFIG_SMP */
+#endif
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
+ {
+ .procname = "hardlockup_panic",
+ .data = &hardlockup_panic,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+#ifdef CONFIG_SMP
+ {
+ .procname = "hardlockup_all_cpu_backtrace",
+ .data = &sysctl_hardlockup_all_cpu_backtrace,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+#endif /* CONFIG_SMP */
+#endif
+ {}
+};
+
+static void __init watchdog_sysctl_init(void)
+{
+ register_sysctl_init("kernel", watchdog_sysctls);
+}
+#else
+#define watchdog_sysctl_init() do { } while (0)
#endif /* CONFIG_SYSCTL */
void __init lockup_detector_init(void)
@@ -753,4 +853,5 @@ void __init lockup_detector_init(void)
if (!watchdog_nmi_probe())
nmi_watchdog_available = true;
lockup_detector_setup();
+ watchdog_sysctl_init();
}
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 06/69] sysctl: make ngroups_max const
2022-01-22 6:10 incoming Andrew Morton
` (4 preceding siblings ...)
2022-01-22 6:11 ` [patch 05/69] watchdog: move watchdog sysctl interface to watchdog.c Andrew Morton
@ 2022-01-22 6:11 ` Andrew Morton
2022-01-22 6:11 ` [patch 07/69] sysctl: use const for typically used max/min proc sysctls Andrew Morton
` (62 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:11 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Stephen Kitt <steve@sk2.org>
Subject: sysctl: make ngroups_max const
ngroups_max is a read-only sysctl entry, reflecting NGROUPS_MAX. Make it
const, in the same way as cap_last_cap.
Link: https://lkml.kernel.org/r/20211123202347.818157-6-mcgrof@kernel.org
Signed-off-by: Stephen Kitt <steve@sk2.org>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Kees Cook <keescook@chromium.org>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
kernel/sysctl.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/kernel/sysctl.c~sysctl-make-ngroups_max-const
+++ a/kernel/sysctl.c
@@ -125,7 +125,7 @@ static unsigned long dirty_bytes_min = 2
static int maxolduid = 65535;
static int minolduid;
-static int ngroups_max = NGROUPS_MAX;
+static const int ngroups_max = NGROUPS_MAX;
static const int cap_last_cap = CAP_LAST_CAP;
@@ -2291,7 +2291,7 @@ static struct ctl_table kern_table[] = {
#endif
{
.procname = "ngroups_max",
- .data = &ngroups_max,
+ .data = (void *)&ngroups_max,
.maxlen = sizeof (int),
.mode = 0444,
.proc_handler = proc_dointvec,
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 07/69] sysctl: use const for typically used max/min proc sysctls
2022-01-22 6:10 incoming Andrew Morton
` (5 preceding siblings ...)
2022-01-22 6:11 ` [patch 06/69] sysctl: make ngroups_max const Andrew Morton
@ 2022-01-22 6:11 ` Andrew Morton
2022-01-22 6:11 ` [patch 08/69] sysctl: use SYSCTL_ZERO to replace some static int zero uses Andrew Morton
` (61 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:11 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: sysctl: use const for typically used max/min proc sysctls
When proc_dointvec_minmax() or proc_doulongvec_minmax() are used we are
using the extra1 and extra2 parameters on the sysctl table only for a min
and max boundary, these extra1 and extra2 arguments are then used for
read-only operations. So make them const to reflect this.
[mcgrof@kernel.org: commit log love]
Link: https://lkml.kernel.org/r/20211123202347.818157-7-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Kees Cook <keescook@chromium.org>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
kernel/sysctl.c | 53 ++++++++++++++++++++++------------------------
1 file changed, 26 insertions(+), 27 deletions(-)
--- a/kernel/sysctl.c~sysctl-use-const-for-typically-used-max-min-proc-sysctls
+++ a/kernel/sysctl.c
@@ -108,27 +108,26 @@
/* Constants used for minimum and maximum */
-static unsigned long zero_ul;
-static unsigned long one_ul = 1;
-static unsigned long long_max = LONG_MAX;
+static const unsigned long zero_ul;
+static const unsigned long one_ul = 1;
+static const unsigned long long_max = LONG_MAX;
#ifdef CONFIG_PRINTK
-static int ten_thousand = 10000;
+static const int ten_thousand = 10000;
#endif
#ifdef CONFIG_PERF_EVENTS
-static int six_hundred_forty_kb = 640 * 1024;
+static const int six_hundred_forty_kb = 640 * 1024;
#endif
/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
-static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
+static const unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
-static int maxolduid = 65535;
-static int minolduid;
+static const int maxolduid = 65535;
+static const int minolduid;
static const int ngroups_max = NGROUPS_MAX;
static const int cap_last_cap = CAP_LAST_CAP;
-
#ifdef CONFIG_INOTIFY_USER
#include <linux/inotify.h>
#endif
@@ -172,8 +171,8 @@ int sysctl_legacy_va_layout;
#endif
#ifdef CONFIG_COMPACTION
-static int min_extfrag_threshold;
-static int max_extfrag_threshold = 1000;
+static const int min_extfrag_threshold;
+static const int max_extfrag_threshold = 1000;
#endif
#endif /* CONFIG_SYSCTL */
@@ -2177,8 +2176,8 @@ static struct ctl_table kern_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = &minolduid,
- .extra2 = &maxolduid,
+ .extra1 = (void *)&minolduid,
+ .extra2 = (void *)&maxolduid,
},
{
.procname = "overflowgid",
@@ -2186,8 +2185,8 @@ static struct ctl_table kern_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = &minolduid,
- .extra2 = &maxolduid,
+ .extra1 = (void *)&minolduid,
+ .extra2 = (void *)&maxolduid,
},
#ifdef CONFIG_S390
{
@@ -2261,7 +2260,7 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
- .extra2 = &ten_thousand,
+ .extra2 = (void *)&ten_thousand,
},
{
.procname = "printk_devkmsg",
@@ -2473,7 +2472,7 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = perf_event_max_stack_handler,
.extra1 = SYSCTL_ZERO,
- .extra2 = &six_hundred_forty_kb,
+ .extra2 = (void *)&six_hundred_forty_kb,
},
{
.procname = "perf_event_max_contexts_per_stack",
@@ -2629,7 +2628,7 @@ static struct ctl_table vm_table[] = {
.maxlen = sizeof(dirty_background_bytes),
.mode = 0644,
.proc_handler = dirty_background_bytes_handler,
- .extra1 = &one_ul,
+ .extra1 = (void *)&one_ul,
},
{
.procname = "dirty_ratio",
@@ -2646,7 +2645,7 @@ static struct ctl_table vm_table[] = {
.maxlen = sizeof(vm_dirty_bytes),
.mode = 0644,
.proc_handler = dirty_bytes_handler,
- .extra1 = &dirty_bytes_min,
+ .extra1 = (void *)&dirty_bytes_min,
},
{
.procname = "dirty_writeback_centisecs",
@@ -2760,8 +2759,8 @@ static struct ctl_table vm_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = &min_extfrag_threshold,
- .extra2 = &max_extfrag_threshold,
+ .extra1 = (void *)&min_extfrag_threshold,
+ .extra2 = (void *)&max_extfrag_threshold,
},
{
.procname = "compact_unevictable_allowed",
@@ -3047,8 +3046,8 @@ static struct ctl_table fs_table[] = {
.maxlen = sizeof(files_stat.max_files),
.mode = 0644,
.proc_handler = proc_doulongvec_minmax,
- .extra1 = &zero_ul,
- .extra2 = &long_max,
+ .extra1 = (void *)&zero_ul,
+ .extra2 = (void *)&long_max,
},
{
.procname = "nr_open",
@@ -3072,8 +3071,8 @@ static struct ctl_table fs_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = &minolduid,
- .extra2 = &maxolduid,
+ .extra1 = (void *)&minolduid,
+ .extra2 = (void *)&maxolduid,
},
{
.procname = "overflowgid",
@@ -3081,8 +3080,8 @@ static struct ctl_table fs_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = &minolduid,
- .extra2 = &maxolduid,
+ .extra1 = (void *)&minolduid,
+ .extra2 = (void *)&maxolduid,
},
#ifdef CONFIG_FILE_LOCKING
{
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 08/69] sysctl: use SYSCTL_ZERO to replace some static int zero uses
2022-01-22 6:10 incoming Andrew Morton
` (6 preceding siblings ...)
2022-01-22 6:11 ` [patch 07/69] sysctl: use const for typically used max/min proc sysctls Andrew Morton
@ 2022-01-22 6:11 ` Andrew Morton
2022-01-22 6:11 ` [patch 09/69] aio: move aio sysctl to aio.c Andrew Morton
` (60 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:11 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: sysctl: use SYSCTL_ZERO to replace some static int zero uses
Use the variable SYSCTL_ZERO to replace some static int boundary variables
with a value of 0 (minolduid, min_extfrag_threshold,
min_wakeup_granularity_ns).
Link: https://lkml.kernel.org/r/20211123202347.818157-8-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Kees Cook <keescook@chromium.org>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
kernel/sysctl.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
--- a/kernel/sysctl.c~sysctl-use-sysctl_zero-to-replace-some-static-int-zero-uses
+++ a/kernel/sysctl.c
@@ -123,7 +123,7 @@ static const unsigned long dirty_bytes_m
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
static const int maxolduid = 65535;
-static const int minolduid;
+/* minolduid is SYSCTL_ZERO */
static const int ngroups_max = NGROUPS_MAX;
static const int cap_last_cap = CAP_LAST_CAP;
@@ -171,7 +171,7 @@ int sysctl_legacy_va_layout;
#endif
#ifdef CONFIG_COMPACTION
-static const int min_extfrag_threshold;
+/* min_extfrag_threshold is SYSCTL_ZERO */;
static const int max_extfrag_threshold = 1000;
#endif
@@ -2176,7 +2176,7 @@ static struct ctl_table kern_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = (void *)&minolduid,
+ .extra1 = SYSCTL_ZERO,
.extra2 = (void *)&maxolduid,
},
{
@@ -2185,7 +2185,7 @@ static struct ctl_table kern_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = (void *)&minolduid,
+ .extra1 = SYSCTL_ZERO,
.extra2 = (void *)&maxolduid,
},
#ifdef CONFIG_S390
@@ -2759,7 +2759,7 @@ static struct ctl_table vm_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = (void *)&min_extfrag_threshold,
+ .extra1 = SYSCTL_ZERO,
.extra2 = (void *)&max_extfrag_threshold,
},
{
@@ -3071,7 +3071,7 @@ static struct ctl_table fs_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = (void *)&minolduid,
+ .extra1 = SYSCTL_ZERO,
.extra2 = (void *)&maxolduid,
},
{
@@ -3080,7 +3080,7 @@ static struct ctl_table fs_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = (void *)&minolduid,
+ .extra1 = SYSCTL_ZERO,
.extra2 = (void *)&maxolduid,
},
#ifdef CONFIG_FILE_LOCKING
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 09/69] aio: move aio sysctl to aio.c
2022-01-22 6:10 incoming Andrew Morton
` (7 preceding siblings ...)
2022-01-22 6:11 ` [patch 08/69] sysctl: use SYSCTL_ZERO to replace some static int zero uses Andrew Morton
@ 2022-01-22 6:11 ` Andrew Morton
2022-01-22 6:11 ` [patch 10/69] dnotify: move dnotify sysctl to dnotify.c Andrew Morton
` (59 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:11 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: aio: move aio sysctl to aio.c
The kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
Move aio sysctl to aio.c and use the new register_sysctl_init() to
register the sysctl interface for aio.
[mcgrof@kernel.org: adjust commit log to justify the move]
Link: https://lkml.kernel.org/r/20211123202347.818157-9-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/aio.c | 31 +++++++++++++++++++++++++++++--
include/linux/aio.h | 4 ----
kernel/sysctl.c | 17 -----------------
3 files changed, 29 insertions(+), 23 deletions(-)
--- a/fs/aio.c~aio-move-aio-sysctl-to-aioc
+++ a/fs/aio.c
@@ -220,9 +220,35 @@ struct aio_kiocb {
/*------ sysctl variables----*/
static DEFINE_SPINLOCK(aio_nr_lock);
-unsigned long aio_nr; /* current system wide number of aio requests */
-unsigned long aio_max_nr = 0x10000; /* system wide maximum number of aio requests */
+static unsigned long aio_nr; /* current system wide number of aio requests */
+static unsigned long aio_max_nr = 0x10000; /* system wide maximum number of aio requests */
/*----end sysctl variables---*/
+#ifdef CONFIG_SYSCTL
+static struct ctl_table aio_sysctls[] = {
+ {
+ .procname = "aio-nr",
+ .data = &aio_nr,
+ .maxlen = sizeof(aio_nr),
+ .mode = 0444,
+ .proc_handler = proc_doulongvec_minmax,
+ },
+ {
+ .procname = "aio-max-nr",
+ .data = &aio_max_nr,
+ .maxlen = sizeof(aio_max_nr),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ },
+ {}
+};
+
+static void __init aio_sysctl_init(void)
+{
+ register_sysctl_init("fs", aio_sysctls);
+}
+#else
+#define aio_sysctl_init() do { } while (0)
+#endif
static struct kmem_cache *kiocb_cachep;
static struct kmem_cache *kioctx_cachep;
@@ -275,6 +301,7 @@ static int __init aio_setup(void)
kiocb_cachep = KMEM_CACHE(aio_kiocb, SLAB_HWCACHE_ALIGN|SLAB_PANIC);
kioctx_cachep = KMEM_CACHE(kioctx,SLAB_HWCACHE_ALIGN|SLAB_PANIC);
+ aio_sysctl_init();
return 0;
}
__initcall(aio_setup);
--- a/include/linux/aio.h~aio-move-aio-sysctl-to-aioc
+++ a/include/linux/aio.h
@@ -20,8 +20,4 @@ static inline void kiocb_set_cancel_fn(s
kiocb_cancel_fn *cancel) { }
#endif /* CONFIG_AIO */
-/* for sysctl: */
-extern unsigned long aio_nr;
-extern unsigned long aio_max_nr;
-
#endif /* __LINUX__AIO_H */
--- a/kernel/sysctl.c~aio-move-aio-sysctl-to-aioc
+++ a/kernel/sysctl.c
@@ -20,7 +20,6 @@
*/
#include <linux/module.h>
-#include <linux/aio.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/slab.h>
@@ -3111,22 +3110,6 @@ static struct ctl_table fs_table[] = {
.proc_handler = proc_dointvec,
},
#endif
-#ifdef CONFIG_AIO
- {
- .procname = "aio-nr",
- .data = &aio_nr,
- .maxlen = sizeof(aio_nr),
- .mode = 0444,
- .proc_handler = proc_doulongvec_minmax,
- },
- {
- .procname = "aio-max-nr",
- .data = &aio_max_nr,
- .maxlen = sizeof(aio_max_nr),
- .mode = 0644,
- .proc_handler = proc_doulongvec_minmax,
- },
-#endif /* CONFIG_AIO */
#ifdef CONFIG_INOTIFY_USER
{
.procname = "inotify",
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 10/69] dnotify: move dnotify sysctl to dnotify.c
2022-01-22 6:10 incoming Andrew Morton
` (8 preceding siblings ...)
2022-01-22 6:11 ` [patch 09/69] aio: move aio sysctl to aio.c Andrew Morton
@ 2022-01-22 6:11 ` Andrew Morton
2022-01-22 6:11 ` [patch 11/69] hpet: simplify subdirectory registration with register_sysctl() Andrew Morton
` (58 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:11 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: dnotify: move dnotify sysctl to dnotify.c
The kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
So move dnotify sysctls to dnotify.c and use the new
register_sysctl_init() to register the sysctl interface.
[mcgrof@kernel.org: adjust the commit log to justify the move]
Link: https://lkml.kernel.org/r/20211123202347.818157-10-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Acked-by: Jan Kara <jack@suse.cz>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/notify/dnotify/dnotify.c | 21 ++++++++++++++++++++-
include/linux/dnotify.h | 1 -
kernel/sysctl.c | 10 ----------
3 files changed, 20 insertions(+), 12 deletions(-)
--- a/fs/notify/dnotify/dnotify.c~dnotify-move-dnotify-sysctl-to-dnotifyc
+++ a/fs/notify/dnotify/dnotify.c
@@ -19,7 +19,25 @@
#include <linux/fdtable.h>
#include <linux/fsnotify_backend.h>
-int dir_notify_enable __read_mostly = 1;
+static int dir_notify_enable __read_mostly = 1;
+#ifdef CONFIG_SYSCTL
+static struct ctl_table dnotify_sysctls[] = {
+ {
+ .procname = "dir-notify-enable",
+ .data = &dir_notify_enable,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {}
+};
+static void __init dnotify_sysctl_init(void)
+{
+ register_sysctl_init("fs", dnotify_sysctls);
+}
+#else
+#define dnotify_sysctl_init() do { } while (0)
+#endif
static struct kmem_cache *dnotify_struct_cache __read_mostly;
static struct kmem_cache *dnotify_mark_cache __read_mostly;
@@ -386,6 +404,7 @@ static int __init dnotify_init(void)
dnotify_group = fsnotify_alloc_group(&dnotify_fsnotify_ops);
if (IS_ERR(dnotify_group))
panic("unable to allocate fsnotify group for dnotify\n");
+ dnotify_sysctl_init();
return 0;
}
--- a/include/linux/dnotify.h~dnotify-move-dnotify-sysctl-to-dnotifyc
+++ a/include/linux/dnotify.h
@@ -29,7 +29,6 @@ struct dnotify_struct {
FS_CREATE | FS_RENAME |\
FS_MOVED_FROM | FS_MOVED_TO)
-extern int dir_notify_enable;
extern void dnotify_flush(struct file *, fl_owner_t);
extern int fcntl_dirnotify(int, struct file *, unsigned long);
--- a/kernel/sysctl.c~dnotify-move-dnotify-sysctl-to-dnotifyc
+++ a/kernel/sysctl.c
@@ -49,7 +49,6 @@
#include <linux/times.h>
#include <linux/limits.h>
#include <linux/dcache.h>
-#include <linux/dnotify.h>
#include <linux/syscalls.h>
#include <linux/vmstat.h>
#include <linux/nfs_fs.h>
@@ -3089,15 +3088,6 @@ static struct ctl_table fs_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
- },
-#endif
-#ifdef CONFIG_DNOTIFY
- {
- .procname = "dir-notify-enable",
- .data = &dir_notify_enable,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
},
#endif
#ifdef CONFIG_MMU
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 11/69] hpet: simplify subdirectory registration with register_sysctl()
2022-01-22 6:10 incoming Andrew Morton
` (9 preceding siblings ...)
2022-01-22 6:11 ` [patch 10/69] dnotify: move dnotify sysctl to dnotify.c Andrew Morton
@ 2022-01-22 6:11 ` Andrew Morton
2022-01-22 6:11 ` [patch 12/69] i915: " Andrew Morton
` (57 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:11 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: hpet: simplify subdirectory registration with register_sysctl()
Patch series "sysctl: second set of kernel/sysctl cleanups", v2.
This is the 2nd set of kernel/sysctl.c cleanups. The diff stat should
reflect how this is a much better way to deal with theses. Fortunately
coccinelle can be used to ensure correctness for most of these and/or
future merge conflicts.
Note that since this is part of a larger effort to cleanup kernel/sysctl.c
I think we have no other option but to go with merging these patches in
either Andrew's tree or keep them staged in a separate tree and send a
merge request later. Otherwise kernel/sysctl.c will end up becoming a
sore spot for the next merge window.
This patch (of 8):
There is no need to user boiler plate code to specify a set of base
directories we're going to stuff sysctls under. Simplify this by using
register_sysctl() and specifying the directory path directly.
// pycocci sysctl-subdir-register-sysctl-simplify.cocci drivers/char/hpet.c
@c1@
expression E1;
identifier subdir, sysctls;
@@
static struct ctl_table subdir[] = {
{
.procname = E1,
.maxlen = 0,
.mode = 0555,
.child = sysctls,
},
{ }
};
@c2@
identifier c1.subdir;
expression E2;
identifier base;
@@
static struct ctl_table base[] = {
{
.procname = E2,
.maxlen = 0,
.mode = 0555,
.child = subdir,
},
{ }
};
@c3@
identifier c2.base;
identifier header;
@@
header = register_sysctl_table(base);
@r1 depends on c1 && c2 && c3@
expression c1.E1;
identifier c1.subdir, c1.sysctls;
@@
-static struct ctl_table subdir[] = {
- {
- .procname = E1,
- .maxlen = 0,
- .mode = 0555,
- .child = sysctls,
- },
- { }
-};
@r2 depends on c1 && c2 && c3@
identifier c1.subdir;
expression c2.E2;
identifier c2.base;
@@
-static struct ctl_table base[] = {
- {
- .procname = E2,
- .maxlen = 0,
- .mode = 0555,
- .child = subdir,
- },
- { }
-};
@initialize:python@
@@
def make_my_fresh_expression(s1, s2):
return '"' + s1.strip('"') + "/" + s2.strip('"') + '"'
@r3 depends on c1 && c2 && c3@
expression c1.E1;
identifier c1.sysctls;
expression c2.E2;
identifier c2.base;
identifier c3.header;
fresh identifier E3 = script:python(E2, E1) { make_my_fresh_expression(E2, E1) };
@@
header =
-register_sysctl_table(base);
+register_sysctl(E3, sysctls);
Generated-by: Coccinelle SmPL
Link: https://lkml.kernel.org/r/20211123202422.819032-1-mcgrof@kernel.org
Link: https://lkml.kernel.org/r/20211123202422.819032-2-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
drivers/char/hpet.c | 22 +---------------------
1 file changed, 1 insertion(+), 21 deletions(-)
--- a/drivers/char/hpet.c~hpet-simplify-subdirectory-registration-with-register_sysctl
+++ a/drivers/char/hpet.c
@@ -746,26 +746,6 @@ static struct ctl_table hpet_table[] = {
{}
};
-static struct ctl_table hpet_root[] = {
- {
- .procname = "hpet",
- .maxlen = 0,
- .mode = 0555,
- .child = hpet_table,
- },
- {}
-};
-
-static struct ctl_table dev_root[] = {
- {
- .procname = "dev",
- .maxlen = 0,
- .mode = 0555,
- .child = hpet_root,
- },
- {}
-};
-
static struct ctl_table_header *sysctl_header;
/*
@@ -1061,7 +1041,7 @@ static int __init hpet_init(void)
if (result < 0)
return -ENODEV;
- sysctl_header = register_sysctl_table(dev_root);
+ sysctl_header = register_sysctl("dev/hpet", hpet_table);
result = acpi_bus_register_driver(&hpet_acpi_driver);
if (result < 0) {
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 12/69] i915: simplify subdirectory registration with register_sysctl()
2022-01-22 6:10 incoming Andrew Morton
` (10 preceding siblings ...)
2022-01-22 6:11 ` [patch 11/69] hpet: simplify subdirectory registration with register_sysctl() Andrew Morton
@ 2022-01-22 6:11 ` Andrew Morton
2022-01-22 6:11 ` [patch 13/69] macintosh/mac_hid.c: " Andrew Morton
` (56 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:11 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: i915: simplify subdirectory registration with register_sysctl()
There is no need to user boiler plate code to specify a set of base
directories we're going to stuff sysctls under. Simplify this by using
register_sysctl() and specifying the directory path directly.
// pycocci sysctl-subdir-register-sysctl-simplify.cocci PATH
@c1@
expression E1;
identifier subdir, sysctls;
@@
static struct ctl_table subdir[] = {
{
.procname = E1,
.maxlen = 0,
.mode = 0555,
.child = sysctls,
},
{ }
};
@c2@
identifier c1.subdir;
expression E2;
identifier base;
@@
static struct ctl_table base[] = {
{
.procname = E2,
.maxlen = 0,
.mode = 0555,
.child = subdir,
},
{ }
};
@c3@
identifier c2.base;
identifier header;
@@
header = register_sysctl_table(base);
@r1 depends on c1 && c2 && c3@
expression c1.E1;
identifier c1.subdir, c1.sysctls;
@@
-static struct ctl_table subdir[] = {
- {
- .procname = E1,
- .maxlen = 0,
- .mode = 0555,
- .child = sysctls,
- },
- { }
-};
@r2 depends on c1 && c2 && c3@
identifier c1.subdir;
expression c2.E2;
identifier c2.base;
@@
-static struct ctl_table base[] = {
- {
- .procname = E2,
- .maxlen = 0,
- .mode = 0555,
- .child = subdir,
- },
- { }
-};
@initialize:python@
@@
def make_my_fresh_expression(s1, s2):
return '"' + s1.strip('"') + "/" + s2.strip('"') + '"'
@r3 depends on c1 && c2 && c3@
expression c1.E1;
identifier c1.sysctls;
expression c2.E2;
identifier c2.base;
identifier c3.header;
fresh identifier E3 = script:python(E2, E1) { make_my_fresh_expression(E2, E1) };
@@
header =
-register_sysctl_table(base);
+register_sysctl(E3, sysctls);
Generated-by: Coccinelle SmPL
Link: https://lkml.kernel.org/r/20211123202422.819032-3-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
drivers/gpu/drm/i915/i915_perf.c | 22 +---------------------
1 file changed, 1 insertion(+), 21 deletions(-)
--- a/drivers/gpu/drm/i915/i915_perf.c~i915-simplify-subdirectory-registration-with-register_sysctl
+++ a/drivers/gpu/drm/i915/i915_perf.c
@@ -4273,26 +4273,6 @@ static struct ctl_table oa_table[] = {
{}
};
-static struct ctl_table i915_root[] = {
- {
- .procname = "i915",
- .maxlen = 0,
- .mode = 0555,
- .child = oa_table,
- },
- {}
-};
-
-static struct ctl_table dev_root[] = {
- {
- .procname = "dev",
- .maxlen = 0,
- .mode = 0555,
- .child = i915_root,
- },
- {}
-};
-
static void oa_init_supported_formats(struct i915_perf *perf)
{
struct drm_i915_private *i915 = perf->i915;
@@ -4488,7 +4468,7 @@ static int destroy_config(int id, void *
int i915_perf_sysctl_register(void)
{
- sysctl_header = register_sysctl_table(dev_root);
+ sysctl_header = register_sysctl("dev/i915", oa_table);
return 0;
}
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 13/69] macintosh/mac_hid.c: simplify subdirectory registration with register_sysctl()
2022-01-22 6:10 incoming Andrew Morton
` (11 preceding siblings ...)
2022-01-22 6:11 ` [patch 12/69] i915: " Andrew Morton
@ 2022-01-22 6:11 ` Andrew Morton
2022-01-22 6:11 ` [patch 14/69] ocfs2: " Andrew Morton
` (55 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:11 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: macintosh/mac_hid.c: simplify subdirectory registration with register_sysctl()
There is no need to user boiler plate code to specify a set of base
directories we're going to stuff sysctls under. Simplify this by using
register_sysctl() and specifying the directory path directly.
// pycocci sysctl-subdir-register-sysctl-simplify.cocci PATH
@c1@
expression E1;
identifier subdir, sysctls;
@@
static struct ctl_table subdir[] = {
{
.procname = E1,
.maxlen = 0,
.mode = 0555,
.child = sysctls,
},
{ }
};
@c2@
identifier c1.subdir;
expression E2;
identifier base;
@@
static struct ctl_table base[] = {
{
.procname = E2,
.maxlen = 0,
.mode = 0555,
.child = subdir,
},
{ }
};
@c3@
identifier c2.base;
identifier header;
@@
header = register_sysctl_table(base);
@r1 depends on c1 && c2 && c3@
expression c1.E1;
identifier c1.subdir, c1.sysctls;
@@
-static struct ctl_table subdir[] = {
- {
- .procname = E1,
- .maxlen = 0,
- .mode = 0555,
- .child = sysctls,
- },
- { }
-};
@r2 depends on c1 && c2 && c3@
identifier c1.subdir;
expression c2.E2;
identifier c2.base;
@@
-static struct ctl_table base[] = {
- {
- .procname = E2,
- .maxlen = 0,
- .mode = 0555,
- .child = subdir,
- },
- { }
-};
@initialize:python@
@@
def make_my_fresh_expression(s1, s2):
return '"' + s1.strip('"') + "/" + s2.strip('"') + '"'
@r3 depends on c1 && c2 && c3@
expression c1.E1;
identifier c1.sysctls;
expression c2.E2;
identifier c2.base;
identifier c3.header;
fresh identifier E3 = script:python(E2, E1) { make_my_fresh_expression(E2, E1) };
@@
header =
-register_sysctl_table(base);
+register_sysctl(E3, sysctls);
Generated-by: Coccinelle SmPL
Link: https://lkml.kernel.org/r/20211123202422.819032-4-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
drivers/macintosh/mac_hid.c | 24 +-----------------------
1 file changed, 1 insertion(+), 23 deletions(-)
--- a/drivers/macintosh/mac_hid.c~macintosh-mac_hidc-simplify-subdirectory-registration-with-register_sysctl
+++ a/drivers/macintosh/mac_hid.c
@@ -239,33 +239,11 @@ static struct ctl_table mac_hid_files[]
{ }
};
-/* dir in /proc/sys/dev */
-static struct ctl_table mac_hid_dir[] = {
- {
- .procname = "mac_hid",
- .maxlen = 0,
- .mode = 0555,
- .child = mac_hid_files,
- },
- { }
-};
-
-/* /proc/sys/dev itself, in case that is not there yet */
-static struct ctl_table mac_hid_root_dir[] = {
- {
- .procname = "dev",
- .maxlen = 0,
- .mode = 0555,
- .child = mac_hid_dir,
- },
- { }
-};
-
static struct ctl_table_header *mac_hid_sysctl_header;
static int __init mac_hid_init(void)
{
- mac_hid_sysctl_header = register_sysctl_table(mac_hid_root_dir);
+ mac_hid_sysctl_header = register_sysctl("dev/mac_hid", mac_hid_files);
if (!mac_hid_sysctl_header)
return -ENOMEM;
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 14/69] ocfs2: simplify subdirectory registration with register_sysctl()
2022-01-22 6:10 incoming Andrew Morton
` (12 preceding siblings ...)
2022-01-22 6:11 ` [patch 13/69] macintosh/mac_hid.c: " Andrew Morton
@ 2022-01-22 6:11 ` Andrew Morton
2022-01-22 6:11 ` [patch 15/69] test_sysctl: " Andrew Morton
` (54 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:11 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: ocfs2: simplify subdirectory registration with register_sysctl()
There is no need to user boiler plate code to specify a set of base
directories we're going to stuff sysctls under. Simplify this by using
register_sysctl() and specifying the directory path directly.
// pycocci sysctl-subdir-register-sysctl-simplify.cocci PATH
@c1@
expression E1;
identifier subdir, sysctls;
@@
static struct ctl_table subdir[] = {
{
.procname = E1,
.maxlen = 0,
.mode = 0555,
.child = sysctls,
},
{ }
};
@c2@
identifier c1.subdir;
expression E2;
identifier base;
@@
static struct ctl_table base[] = {
{
.procname = E2,
.maxlen = 0,
.mode = 0555,
.child = subdir,
},
{ }
};
@c3@
identifier c2.base;
identifier header;
@@
header = register_sysctl_table(base);
@r1 depends on c1 && c2 && c3@
expression c1.E1;
identifier c1.subdir, c1.sysctls;
@@
-static struct ctl_table subdir[] = {
- {
- .procname = E1,
- .maxlen = 0,
- .mode = 0555,
- .child = sysctls,
- },
- { }
-};
@r2 depends on c1 && c2 && c3@
identifier c1.subdir;
expression c2.E2;
identifier c2.base;
@@
-static struct ctl_table base[] = {
- {
- .procname = E2,
- .maxlen = 0,
- .mode = 0555,
- .child = subdir,
- },
- { }
-};
@initialize:python@
@@
def make_my_fresh_expression(s1, s2):
return '"' + s1.strip('"') + "/" + s2.strip('"') + '"'
@r3 depends on c1 && c2 && c3@
expression c1.E1;
identifier c1.sysctls;
expression c2.E2;
identifier c2.base;
identifier c3.header;
fresh identifier E3 = script:python(E2, E1) { make_my_fresh_expression(E2, E1) };
@@
header =
-register_sysctl_table(base);
+register_sysctl(E3, sysctls);
Generated-by: Coccinelle SmPL
Link: https://lkml.kernel.org/r/20211123202422.819032-5-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/ocfs2/stackglue.c | 25 +------------------------
1 file changed, 1 insertion(+), 24 deletions(-)
--- a/fs/ocfs2/stackglue.c~ocfs2-simplify-subdirectory-registration-with-register_sysctl
+++ a/fs/ocfs2/stackglue.c
@@ -672,31 +672,8 @@ static struct ctl_table ocfs2_mod_table[
{ }
};
-static struct ctl_table ocfs2_kern_table[] = {
- {
- .procname = "ocfs2",
- .data = NULL,
- .maxlen = 0,
- .mode = 0555,
- .child = ocfs2_mod_table
- },
- { }
-};
-
-static struct ctl_table ocfs2_root_table[] = {
- {
- .procname = "fs",
- .data = NULL,
- .maxlen = 0,
- .mode = 0555,
- .child = ocfs2_kern_table
- },
- { }
-};
-
static struct ctl_table_header *ocfs2_table_header;
-
/*
* Initialization
*/
@@ -705,7 +682,7 @@ static int __init ocfs2_stack_glue_init(
{
strcpy(cluster_stack_name, OCFS2_STACK_PLUGIN_O2CB);
- ocfs2_table_header = register_sysctl_table(ocfs2_root_table);
+ ocfs2_table_header = register_sysctl("fs/ocfs2", ocfs2_mod_table);
if (!ocfs2_table_header) {
printk(KERN_ERR
"ocfs2 stack glue: unable to register sysctl\n");
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 15/69] test_sysctl: simplify subdirectory registration with register_sysctl()
2022-01-22 6:10 incoming Andrew Morton
` (13 preceding siblings ...)
2022-01-22 6:11 ` [patch 14/69] ocfs2: " Andrew Morton
@ 2022-01-22 6:11 ` Andrew Morton
2022-01-22 6:11 ` [patch 16/69] inotify: " Andrew Morton
` (53 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:11 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: test_sysctl: simplify subdirectory registration with register_sysctl()
There is no need to user boiler plate code to specify a set of base
directories we're going to stuff sysctls under. Simplify this by using
register_sysctl() and specifying the directory path directly.
// pycocci sysctl-subdir-register-sysctl-simplify.cocci lib/test_sysctl.c
@c1@
expression E1;
identifier subdir, sysctls;
@@
static struct ctl_table subdir[] = {
{
.procname = E1,
.maxlen = 0,
.mode = 0555,
.child = sysctls,
},
{ }
};
@c2@
identifier c1.subdir;
expression E2;
identifier base;
@@
static struct ctl_table base[] = {
{
.procname = E2,
.maxlen = 0,
.mode = 0555,
.child = subdir,
},
{ }
};
@c3@
identifier c2.base;
identifier header;
@@
header = register_sysctl_table(base);
@r1 depends on c1 && c2 && c3@
expression c1.E1;
identifier c1.subdir, c1.sysctls;
@@
-static struct ctl_table subdir[] = {
- {
- .procname = E1,
- .maxlen = 0,
- .mode = 0555,
- .child = sysctls,
- },
- { }
-};
@r2 depends on c1 && c2 && c3@
identifier c1.subdir;
expression c2.E2;
identifier c2.base;
@@
-static struct ctl_table base[] = {
- {
- .procname = E2,
- .maxlen = 0,
- .mode = 0555,
- .child = subdir,
- },
- { }
-};
@initialize:python@
@@
def make_my_fresh_expression(s1, s2):
return '"' + s1.strip('"') + "/" + s2.strip('"') + '"'
@r3 depends on c1 && c2 && c3@
expression c1.E1;
identifier c1.sysctls;
expression c2.E2;
identifier c2.base;
identifier c3.header;
fresh identifier E3 = script:python(E2, E1) { make_my_fresh_expression(E2, E1) };
@@
header =
-register_sysctl_table(base);
+register_sysctl(E3, sysctls);
Generated-by: Coccinelle SmPL
Link: https://lkml.kernel.org/r/20211123202422.819032-6-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
lib/test_sysctl.c | 22 +---------------------
1 file changed, 1 insertion(+), 21 deletions(-)
--- a/lib/test_sysctl.c~test_sysctl-simplify-subdirectory-registration-with-register_sysctl
+++ a/lib/test_sysctl.c
@@ -128,26 +128,6 @@ static struct ctl_table test_table[] = {
{ }
};
-static struct ctl_table test_sysctl_table[] = {
- {
- .procname = "test_sysctl",
- .maxlen = 0,
- .mode = 0555,
- .child = test_table,
- },
- { }
-};
-
-static struct ctl_table test_sysctl_root_table[] = {
- {
- .procname = "debug",
- .maxlen = 0,
- .mode = 0555,
- .child = test_sysctl_table,
- },
- { }
-};
-
static struct ctl_table_header *test_sysctl_header;
static int __init test_sysctl_init(void)
@@ -155,7 +135,7 @@ static int __init test_sysctl_init(void)
test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL);
if (!test_data.bitmap_0001)
return -ENOMEM;
- test_sysctl_header = register_sysctl_table(test_sysctl_root_table);
+ test_sysctl_header = register_sysctl("debug/test_sysctl", test_table);
if (!test_sysctl_header) {
kfree(test_data.bitmap_0001);
return -ENOMEM;
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 16/69] inotify: simplify subdirectory registration with register_sysctl()
2022-01-22 6:10 incoming Andrew Morton
` (14 preceding siblings ...)
2022-01-22 6:11 ` [patch 15/69] test_sysctl: " Andrew Morton
@ 2022-01-22 6:11 ` Andrew Morton
2022-01-22 6:12 ` [patch 17/69] cdrom: " Andrew Morton
` (52 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:11 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: inotify: simplify subdirectory registration with register_sysctl()
There is no need to user boiler plate code to specify a set of base
directories we're going to stuff sysctls under. Simplify this by using
register_sysctl() and specifying the directory path directly.
Move inotify_user sysctl to inotify_user.c while at it to remove clutter
from kernel/sysctl.c.
[mcgrof@kernel.org: remember to register fanotify_table]
Link: https://lkml.kernel.org/r/YZ5A6iWLb0h3N3RC@bombadil.infradead.org
[mcgrof@kernel.org: update commit log to reflect new path we decided to take]
Link: https://lkml.kernel.org/r/20211123202422.819032-7-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/notify/fanotify/fanotify_user.c | 10 +++++++++-
fs/notify/inotify/inotify_user.c | 11 ++++++++++-
include/linux/fanotify.h | 2 --
include/linux/inotify.h | 3 ---
kernel/sysctl.c | 21 ---------------------
5 files changed, 19 insertions(+), 28 deletions(-)
--- a/fs/notify/fanotify/fanotify_user.c~inotify-simplify-subdirectory-registration-with-register_sysctl
+++ a/fs/notify/fanotify/fanotify_user.c
@@ -59,7 +59,7 @@ static int fanotify_max_queued_events __
static long ft_zero = 0;
static long ft_int_max = INT_MAX;
-struct ctl_table fanotify_table[] = {
+static struct ctl_table fanotify_table[] = {
{
.procname = "max_user_groups",
.data = &init_user_ns.ucount_max[UCOUNT_FANOTIFY_GROUPS],
@@ -88,6 +88,13 @@ struct ctl_table fanotify_table[] = {
},
{ }
};
+
+static void __init fanotify_sysctls_init(void)
+{
+ register_sysctl("fs/fanotify", fanotify_table);
+}
+#else
+#define fanotify_sysctls_init() do { } while (0)
#endif /* CONFIG_SYSCTL */
/*
@@ -1743,6 +1750,7 @@ static int __init fanotify_user_setup(vo
init_user_ns.ucount_max[UCOUNT_FANOTIFY_GROUPS] =
FANOTIFY_DEFAULT_MAX_GROUPS;
init_user_ns.ucount_max[UCOUNT_FANOTIFY_MARKS] = max_marks;
+ fanotify_sysctls_init();
return 0;
}
--- a/fs/notify/inotify/inotify_user.c~inotify-simplify-subdirectory-registration-with-register_sysctl
+++ a/fs/notify/inotify/inotify_user.c
@@ -58,7 +58,7 @@ struct kmem_cache *inotify_inode_mark_ca
static long it_zero = 0;
static long it_int_max = INT_MAX;
-struct ctl_table inotify_table[] = {
+static struct ctl_table inotify_table[] = {
{
.procname = "max_user_instances",
.data = &init_user_ns.ucount_max[UCOUNT_INOTIFY_INSTANCES],
@@ -87,6 +87,14 @@ struct ctl_table inotify_table[] = {
},
{ }
};
+
+static void __init inotify_sysctls_init(void)
+{
+ register_sysctl("fs/inotify", inotify_table);
+}
+
+#else
+#define inotify_sysctls_init() do { } while (0)
#endif /* CONFIG_SYSCTL */
static inline __u32 inotify_arg_to_mask(struct inode *inode, u32 arg)
@@ -849,6 +857,7 @@ static int __init inotify_user_setup(voi
inotify_max_queued_events = 16384;
init_user_ns.ucount_max[UCOUNT_INOTIFY_INSTANCES] = 128;
init_user_ns.ucount_max[UCOUNT_INOTIFY_WATCHES] = watches_max;
+ inotify_sysctls_init();
return 0;
}
--- a/include/linux/fanotify.h~inotify-simplify-subdirectory-registration-with-register_sysctl
+++ a/include/linux/fanotify.h
@@ -5,8 +5,6 @@
#include <linux/sysctl.h>
#include <uapi/linux/fanotify.h>
-extern struct ctl_table fanotify_table[]; /* for sysctl */
-
#define FAN_GROUP_FLAG(group, flag) \
((group)->fanotify_data.flags & (flag))
--- a/include/linux/inotify.h~inotify-simplify-subdirectory-registration-with-register_sysctl
+++ a/include/linux/inotify.h
@@ -7,11 +7,8 @@
#ifndef _LINUX_INOTIFY_H
#define _LINUX_INOTIFY_H
-#include <linux/sysctl.h>
#include <uapi/linux/inotify.h>
-extern struct ctl_table inotify_table[]; /* for sysctl */
-
#define ALL_INOTIFY_BITS (IN_ACCESS | IN_MODIFY | IN_ATTRIB | IN_CLOSE_WRITE | \
IN_CLOSE_NOWRITE | IN_OPEN | IN_MOVED_FROM | \
IN_MOVED_TO | IN_CREATE | IN_DELETE | \
--- a/kernel/sysctl.c~inotify-simplify-subdirectory-registration-with-register_sysctl
+++ a/kernel/sysctl.c
@@ -126,13 +126,6 @@ static const int maxolduid = 65535;
static const int ngroups_max = NGROUPS_MAX;
static const int cap_last_cap = CAP_LAST_CAP;
-#ifdef CONFIG_INOTIFY_USER
-#include <linux/inotify.h>
-#endif
-#ifdef CONFIG_FANOTIFY
-#include <linux/fanotify.h>
-#endif
-
#ifdef CONFIG_PROC_SYSCTL
/**
@@ -3100,20 +3093,6 @@ static struct ctl_table fs_table[] = {
.proc_handler = proc_dointvec,
},
#endif
-#ifdef CONFIG_INOTIFY_USER
- {
- .procname = "inotify",
- .mode = 0555,
- .child = inotify_table,
- },
-#endif
-#ifdef CONFIG_FANOTIFY
- {
- .procname = "fanotify",
- .mode = 0555,
- .child = fanotify_table,
- },
-#endif
#ifdef CONFIG_EPOLL
{
.procname = "epoll",
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 17/69] cdrom: simplify subdirectory registration with register_sysctl()
2022-01-22 6:10 incoming Andrew Morton
` (15 preceding siblings ...)
2022-01-22 6:11 ` [patch 16/69] inotify: " Andrew Morton
@ 2022-01-22 6:12 ` Andrew Morton
2022-01-22 6:12 ` [patch 18/69] eventpoll: simplify sysctl declaration " Andrew Morton
` (51 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:12 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: cdrom: simplify subdirectory registration with register_sysctl()
There is no need to user boiler plate code to specify a set of base
directories we're going to stuff sysctls under. Simplify this by using
register_sysctl() and specifying the directory path directly.
// pycocci sysctl-subdir-register-sysctl-simplify.cocci PATH
@c1@
expression E1;
identifier subdir, sysctls;
@@
static struct ctl_table subdir[] = {
{
.procname = E1,
.maxlen = 0,
.mode = 0555,
.child = sysctls,
},
{ }
};
@c2@
identifier c1.subdir;
expression E2;
identifier base;
@@
static struct ctl_table base[] = {
{
.procname = E2,
.maxlen = 0,
.mode = 0555,
.child = subdir,
},
{ }
};
@c3@
identifier c2.base;
identifier header;
@@
header = register_sysctl_table(base);
@r1 depends on c1 && c2 && c3@
expression c1.E1;
identifier c1.subdir, c1.sysctls;
@@
-static struct ctl_table subdir[] = {
- {
- .procname = E1,
- .maxlen = 0,
- .mode = 0555,
- .child = sysctls,
- },
- { }
-};
@r2 depends on c1 && c2 && c3@
identifier c1.subdir;
expression c2.E2;
identifier c2.base;
@@
-static struct ctl_table base[] = {
- {
- .procname = E2,
- .maxlen = 0,
- .mode = 0555,
- .child = subdir,
- },
- { }
-};
@initialize:python@
@@
def make_my_fresh_expression(s1, s2):
return '"' + s1.strip('"') + "/" + s2.strip('"') + '"'
@r3 depends on c1 && c2 && c3@
expression c1.E1;
identifier c1.sysctls;
expression c2.E2;
identifier c2.base;
identifier c3.header;
fresh identifier E3 = script:python(E2, E1) { make_my_fresh_expression(E2, E1) };
@@
header =
-register_sysctl_table(base);
+register_sysctl(E3, sysctls);
Generated-by: Coccinelle SmPL
Link: https://lkml.kernel.org/r/20211123202422.819032-8-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
drivers/cdrom/cdrom.c | 23 +----------------------
1 file changed, 1 insertion(+), 22 deletions(-)
--- a/drivers/cdrom/cdrom.c~cdrom-simplify-subdirectory-registration-with-register_sysctl
+++ a/drivers/cdrom/cdrom.c
@@ -3691,27 +3691,6 @@ static struct ctl_table cdrom_table[] =
},
{ }
};
-
-static struct ctl_table cdrom_cdrom_table[] = {
- {
- .procname = "cdrom",
- .maxlen = 0,
- .mode = 0555,
- .child = cdrom_table,
- },
- { }
-};
-
-/* Make sure that /proc/sys/dev is there */
-static struct ctl_table cdrom_root_table[] = {
- {
- .procname = "dev",
- .maxlen = 0,
- .mode = 0555,
- .child = cdrom_cdrom_table,
- },
- { }
-};
static struct ctl_table_header *cdrom_sysctl_header;
static void cdrom_sysctl_register(void)
@@ -3721,7 +3700,7 @@ static void cdrom_sysctl_register(void)
if (!atomic_add_unless(&initialized, 1, 1))
return;
- cdrom_sysctl_header = register_sysctl_table(cdrom_root_table);
+ cdrom_sysctl_header = register_sysctl("dev/cdrom", cdrom_table);
/* set the defaults */
cdrom_sysctl_settings.autoclose = autoclose;
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 18/69] eventpoll: simplify sysctl declaration with register_sysctl()
2022-01-22 6:10 incoming Andrew Morton
` (16 preceding siblings ...)
2022-01-22 6:12 ` [patch 17/69] cdrom: " Andrew Morton
@ 2022-01-22 6:12 ` Andrew Morton
2022-01-22 6:12 ` [patch 19/69] firmware_loader: move firmware sysctl to its own files Andrew Morton
` (50 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:12 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: eventpoll: simplify sysctl declaration with register_sysctl()
The kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
So move the epoll_table sysctl to fs/eventpoll.c and use
register_sysctl().
Link: https://lkml.kernel.org/r/20211123202422.819032-9-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/eventpoll.c | 10 +++++++++-
include/linux/poll.h | 2 --
include/linux/sysctl.h | 1 -
kernel/sysctl.c | 7 -------
4 files changed, 9 insertions(+), 11 deletions(-)
--- a/fs/eventpoll.c~eventpoll-simplify-sysctl-declaration-with-register_sysctl
+++ a/fs/eventpoll.c
@@ -307,7 +307,7 @@ static void unlist_file(struct epitems_h
static long long_zero;
static long long_max = LONG_MAX;
-struct ctl_table epoll_table[] = {
+static struct ctl_table epoll_table[] = {
{
.procname = "max_user_watches",
.data = &max_user_watches,
@@ -319,6 +319,13 @@ struct ctl_table epoll_table[] = {
},
{ }
};
+
+static void __init epoll_sysctls_init(void)
+{
+ register_sysctl("fs/epoll", epoll_table);
+}
+#else
+#define epoll_sysctls_init() do { } while (0)
#endif /* CONFIG_SYSCTL */
static const struct file_operations eventpoll_fops;
@@ -2378,6 +2385,7 @@ static int __init eventpoll_init(void)
/* Allocates slab cache used to allocate "struct eppoll_entry" */
pwq_cache = kmem_cache_create("eventpoll_pwq",
sizeof(struct eppoll_entry), 0, SLAB_PANIC|SLAB_ACCOUNT, NULL);
+ epoll_sysctls_init();
ephead_cache = kmem_cache_create("ep_head",
sizeof(struct epitems_head), 0, SLAB_PANIC|SLAB_ACCOUNT, NULL);
--- a/include/linux/poll.h~eventpoll-simplify-sysctl-declaration-with-register_sysctl
+++ a/include/linux/poll.h
@@ -8,12 +8,10 @@
#include <linux/wait.h>
#include <linux/string.h>
#include <linux/fs.h>
-#include <linux/sysctl.h>
#include <linux/uaccess.h>
#include <uapi/linux/poll.h>
#include <uapi/linux/eventpoll.h>
-extern struct ctl_table epoll_table[]; /* for sysctl */
/* ~832 bytes of stack space used max in sys_select/sys_poll before allocating
additional memory. */
#ifdef __clang__
--- a/include/linux/sysctl.h~eventpoll-simplify-sysctl-declaration-with-register_sysctl
+++ a/include/linux/sysctl.h
@@ -219,7 +219,6 @@ extern int no_unaligned_warning;
extern struct ctl_table sysctl_mount_point[];
extern struct ctl_table random_table[];
extern struct ctl_table firmware_config_table[];
-extern struct ctl_table epoll_table[];
#else /* CONFIG_SYSCTL */
static inline struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
--- a/kernel/sysctl.c~eventpoll-simplify-sysctl-declaration-with-register_sysctl
+++ a/kernel/sysctl.c
@@ -3093,13 +3093,6 @@ static struct ctl_table fs_table[] = {
.proc_handler = proc_dointvec,
},
#endif
-#ifdef CONFIG_EPOLL
- {
- .procname = "epoll",
- .mode = 0555,
- .child = epoll_table,
- },
-#endif
#endif
{
.procname = "protected_symlinks",
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 19/69] firmware_loader: move firmware sysctl to its own files
2022-01-22 6:10 incoming Andrew Morton
` (17 preceding siblings ...)
2022-01-22 6:12 ` [patch 18/69] eventpoll: simplify sysctl declaration " Andrew Morton
@ 2022-01-22 6:12 ` Andrew Morton
2022-01-22 6:12 ` [patch 20/69] random: move the random sysctl declarations to its own file Andrew Morton
` (49 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:12 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sfr, sre, steve, surenb, torvalds, tytso, viro,
wangqing, yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: firmware_loader: move firmware sysctl to its own files
Patch series "sysctl: 3rd set of kernel/sysctl cleanups", v2.
This is the third set of patches to help address cleaning the kitchen
seink in kernel/sysctl.c and to move sysctls away to where they are
actually implemented / used.
This patch (of 8):
kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
So move the firmware configuration sysctl table to the only place where it
is used, and make it clear that if sysctls are disabled this is not used.
[akpm@linux-foundation.org: export register_firmware_config_sysctl and unregister_firmware_config_sysctl to modules]
[akpm@linux-foundation.org: use EXPORT_SYMBOL_NS_GPL instead]
[sfr@canb.auug.org.au: fix that so it compiles]
Link: https://lkml.kernel.org/r/20211201160626.401d828d@canb.auug.org.au
[mcgrof@kernel.org: major commit log update to justify the move]
Link: https://lkml.kernel.org/r/20211124231435.1445213-1-mcgrof@kernel.org
Link: https://lkml.kernel.org/r/20211124231435.1445213-2-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Kees Cook <keescook@chromium.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Qing Wang <wangqing@vivo.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
drivers/base/firmware_loader/fallback.c | 7 +++-
drivers/base/firmware_loader/fallback.h | 11 +++++++
drivers/base/firmware_loader/fallback_table.c | 25 ++++++++++++++--
include/linux/sysctl.h | 1
kernel/sysctl.c | 7 ----
5 files changed, 40 insertions(+), 11 deletions(-)
--- a/drivers/base/firmware_loader/fallback.c~firmware_loader-move-firmware-sysctl-to-its-own-files
+++ a/drivers/base/firmware_loader/fallback.c
@@ -199,11 +199,16 @@ static struct class firmware_class = {
int register_sysfs_loader(void)
{
- return class_register(&firmware_class);
+ int ret = class_register(&firmware_class);
+
+ if (ret != 0)
+ return ret;
+ return register_firmware_config_sysctl();
}
void unregister_sysfs_loader(void)
{
+ unregister_firmware_config_sysctl();
class_unregister(&firmware_class);
}
--- a/drivers/base/firmware_loader/fallback.h~firmware_loader-move-firmware-sysctl-to-its-own-files
+++ a/drivers/base/firmware_loader/fallback.h
@@ -42,6 +42,17 @@ void fw_fallback_set_default_timeout(voi
int register_sysfs_loader(void);
void unregister_sysfs_loader(void);
+#ifdef CONFIG_SYSCTL
+extern int register_firmware_config_sysctl(void);
+extern void unregister_firmware_config_sysctl(void);
+#else
+static inline int register_firmware_config_sysctl(void)
+{
+ return 0;
+}
+static inline void unregister_firmware_config_sysctl(void) { }
+#endif /* CONFIG_SYSCTL */
+
#else /* CONFIG_FW_LOADER_USER_HELPER */
static inline int firmware_fallback_sysfs(struct firmware *fw, const char *name,
struct device *device,
--- a/drivers/base/firmware_loader/fallback_table.c~firmware_loader-move-firmware-sysctl-to-its-own-files
+++ a/drivers/base/firmware_loader/fallback_table.c
@@ -4,6 +4,7 @@
#include <linux/kconfig.h>
#include <linux/list.h>
#include <linux/slab.h>
+#include <linux/export.h>
#include <linux/security.h>
#include <linux/highmem.h>
#include <linux/umh.h>
@@ -24,7 +25,7 @@ struct firmware_fallback_config fw_fallb
EXPORT_SYMBOL_NS_GPL(fw_fallback_config, FIRMWARE_LOADER_PRIVATE);
#ifdef CONFIG_SYSCTL
-struct ctl_table firmware_config_table[] = {
+static struct ctl_table firmware_config_table[] = {
{
.procname = "force_sysfs_fallback",
.data = &fw_fallback_config.force_sysfs_fallback,
@@ -45,4 +46,24 @@ struct ctl_table firmware_config_table[]
},
{ }
};
-#endif
+
+static struct ctl_table_header *firmware_config_sysct_table_header;
+int register_firmware_config_sysctl(void)
+{
+ firmware_config_sysct_table_header =
+ register_sysctl("kernel/firmware_config",
+ firmware_config_table);
+ if (!firmware_config_sysct_table_header)
+ return -ENOMEM;
+ return 0;
+}
+EXPORT_SYMBOL_NS_GPL(register_firmware_config_sysctl, FIRMWARE_LOADER_PRIVATE);
+
+void unregister_firmware_config_sysctl(void)
+{
+ unregister_sysctl_table(firmware_config_sysct_table_header);
+ firmware_config_sysct_table_header = NULL;
+}
+EXPORT_SYMBOL_NS_GPL(unregister_firmware_config_sysctl, FIRMWARE_LOADER_PRIVATE);
+
+#endif /* CONFIG_SYSCTL */
--- a/include/linux/sysctl.h~firmware_loader-move-firmware-sysctl-to-its-own-files
+++ a/include/linux/sysctl.h
@@ -218,7 +218,6 @@ extern int no_unaligned_warning;
extern struct ctl_table sysctl_mount_point[];
extern struct ctl_table random_table[];
-extern struct ctl_table firmware_config_table[];
#else /* CONFIG_SYSCTL */
static inline struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
--- a/kernel/sysctl.c~firmware_loader-move-firmware-sysctl-to-its-own-files
+++ a/kernel/sysctl.c
@@ -2154,13 +2154,6 @@ static struct ctl_table kern_table[] = {
.mode = 0555,
.child = usermodehelper_table,
},
-#ifdef CONFIG_FW_LOADER_USER_HELPER
- {
- .procname = "firmware_config",
- .mode = 0555,
- .child = firmware_config_table,
- },
-#endif
{
.procname = "overflowuid",
.data = &overflowuid,
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 20/69] random: move the random sysctl declarations to its own file
2022-01-22 6:10 incoming Andrew Morton
` (18 preceding siblings ...)
2022-01-22 6:12 ` [patch 19/69] firmware_loader: move firmware sysctl to its own files Andrew Morton
@ 2022-01-22 6:12 ` Andrew Morton
2022-01-22 6:12 ` [patch 21/69] sysctl: add helper to register a sysctl mount point Andrew Morton
` (48 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:12 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: random: move the random sysctl declarations to its own file
kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
So move the random sysctls to their own file and use register_sysctl_init().
[mcgrof@kernel.org: commit log update to justify the move]
Link: https://lkml.kernel.org/r/20211124231435.1445213-3-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Qing Wang <wangqing@vivo.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
drivers/char/random.c | 14 ++++++++++++--
include/linux/sysctl.h | 1 -
kernel/sysctl.c | 5 -----
3 files changed, 12 insertions(+), 8 deletions(-)
--- a/drivers/char/random.c~random-move-the-random-sysctl-declarations-to-its-own-file
+++ a/drivers/char/random.c
@@ -1992,8 +1992,7 @@ static int proc_do_entropy(struct ctl_ta
}
static int sysctl_poolsize = POOL_BITS;
-extern struct ctl_table random_table[];
-struct ctl_table random_table[] = {
+static struct ctl_table random_table[] = {
{
.procname = "poolsize",
.data = &sysctl_poolsize,
@@ -2055,6 +2054,17 @@ struct ctl_table random_table[] = {
#endif
{ }
};
+
+/*
+ * rand_initialize() is called before sysctl_init(),
+ * so we cannot call register_sysctl_init() in rand_initialize()
+ */
+static int __init random_sysctls_init(void)
+{
+ register_sysctl_init("kernel/random", random_table);
+ return 0;
+}
+device_initcall(random_sysctls_init);
#endif /* CONFIG_SYSCTL */
struct batched_entropy {
--- a/include/linux/sysctl.h~random-move-the-random-sysctl-declarations-to-its-own-file
+++ a/include/linux/sysctl.h
@@ -217,7 +217,6 @@ extern int unaligned_dump_stack;
extern int no_unaligned_warning;
extern struct ctl_table sysctl_mount_point[];
-extern struct ctl_table random_table[];
#else /* CONFIG_SYSCTL */
static inline struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
--- a/kernel/sysctl.c~random-move-the-random-sysctl-declarations-to-its-own-file
+++ a/kernel/sysctl.c
@@ -2145,11 +2145,6 @@ static struct ctl_table kern_table[] = {
.proc_handler = sysctl_max_threads,
},
{
- .procname = "random",
- .mode = 0555,
- .child = random_table,
- },
- {
.procname = "usermodehelper",
.mode = 0555,
.child = usermodehelper_table,
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 21/69] sysctl: add helper to register a sysctl mount point
2022-01-22 6:10 incoming Andrew Morton
` (19 preceding siblings ...)
2022-01-22 6:12 ` [patch 20/69] random: move the random sysctl declarations to its own file Andrew Morton
@ 2022-01-22 6:12 ` Andrew Morton
2022-01-22 6:12 ` [patch 22/69] fs: move binfmt_misc sysctl to its own file Andrew Morton
` (47 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:12 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: sysctl: add helper to register a sysctl mount point
The way to create a subdirectory on top of sysctl_mount_point is a bit
obscure, and *why* we do that even so more. Provide a helper which makes
it clear why we do this.
[akpm@linux-foundation.org: export register_sysctl_mount_point() to modules]
Link: https://lkml.kernel.org/r/20211124231435.1445213-4-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Suggested-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Qing Wang <wangqing@vivo.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/proc/proc_sysctl.c | 14 ++++++++++++++
include/linux/sysctl.h | 7 +++++++
2 files changed, 21 insertions(+)
--- a/fs/proc/proc_sysctl.c~sysctl-add-helper-to-register-a-sysctl-mount-point
+++ a/fs/proc/proc_sysctl.c
@@ -35,6 +35,20 @@ struct ctl_table sysctl_mount_point[] =
{ }
};
+/**
+ * register_sysctl_mount_point() - registers a sysctl mount point
+ * @path: path for the mount point
+ *
+ * Used to create a permanently empty directory to serve as mount point.
+ * There are some subtle but important permission checks this allows in the
+ * case of unprivileged mounts.
+ */
+struct ctl_table_header *register_sysctl_mount_point(const char *path)
+{
+ return register_sysctl(path, sysctl_mount_point);
+}
+EXPORT_SYMBOL(register_sysctl_mount_point);
+
static bool is_empty_dir(struct ctl_table_header *head)
{
return head->ctl_table[0].child == sysctl_mount_point;
--- a/include/linux/sysctl.h~sysctl-add-helper-to-register-a-sysctl-mount-point
+++ a/include/linux/sysctl.h
@@ -209,6 +209,8 @@ extern int sysctl_init(void);
extern void __register_sysctl_init(const char *path, struct ctl_table *table,
const char *table_name);
#define register_sysctl_init(path, table) __register_sysctl_init(path, table, #table)
+extern struct ctl_table_header *register_sysctl_mount_point(const char *path);
+
void do_sysctl_args(void);
extern int pwrsw_enabled;
@@ -223,6 +225,11 @@ static inline struct ctl_table_header *r
{
return NULL;
}
+
+static inline struct sysctl_header *register_sysctl_mount_point(const char *path)
+{
+ return NULL;
+}
static inline struct ctl_table_header *register_sysctl_paths(
const struct ctl_path *path, struct ctl_table *table)
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 22/69] fs: move binfmt_misc sysctl to its own file
2022-01-22 6:10 incoming Andrew Morton
` (20 preceding siblings ...)
2022-01-22 6:12 ` [patch 21/69] sysctl: add helper to register a sysctl mount point Andrew Morton
@ 2022-01-22 6:12 ` Andrew Morton
2022-02-07 13:27 ` [PATCH] Fix regression due to "fs: move binfmt_misc sysctl to its own file" Domenico Andreoli
2022-01-22 6:12 ` [patch 23/69] printk: move printk sysctl to printk/sysctl.c Andrew Morton
` (46 subsequent siblings)
68 siblings, 1 reply; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:12 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: fs: move binfmt_misc sysctl to its own file
kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
This moves the binfmt_misc sysctl to its own file to help remove clutter
from kernel/sysctl.c.
Link: https://lkml.kernel.org/r/20211124231435.1445213-5-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Qing Wang <wangqing@vivo.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/binfmt_misc.c | 6 +++++-
kernel/sysctl.c | 7 -------
2 files changed, 5 insertions(+), 8 deletions(-)
--- a/fs/binfmt_misc.c~fs-move-binfmt_misc-sysctl-to-its-own-file
+++ a/fs/binfmt_misc.c
@@ -822,7 +822,11 @@ static int __init init_misc_binfmt(void)
int err = register_filesystem(&bm_fs_type);
if (!err)
insert_binfmt(&misc_format);
- return err;
+ if (!register_sysctl_mount_point("fs/binfmt_misc")) {
+ pr_warn("Failed to create fs/binfmt_misc sysctl mount point");
+ return -ENOMEM;
+ }
+ return 0;
}
static void __exit exit_misc_binfmt(void)
--- a/kernel/sysctl.c~fs-move-binfmt_misc-sysctl-to-its-own-file
+++ a/kernel/sysctl.c
@@ -3127,13 +3127,6 @@ static struct ctl_table fs_table[] = {
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_TWO,
},
-#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
- {
- .procname = "binfmt_misc",
- .mode = 0555,
- .child = sysctl_mount_point,
- },
-#endif
{
.procname = "pipe-max-size",
.data = &pipe_max_size,
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [PATCH] Fix regression due to "fs: move binfmt_misc sysctl to its own file"
2022-01-22 6:12 ` [patch 22/69] fs: move binfmt_misc sysctl to its own file Andrew Morton
@ 2022-02-07 13:27 ` Domenico Andreoli
2022-02-07 21:46 ` Luis Chamberlain
2022-02-08 6:46 ` [PATCH] " Thorsten Leemhuis
0 siblings, 2 replies; 83+ messages in thread
From: Domenico Andreoli @ 2022-02-07 13:27 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
Cc: linux-kernel
Commit 3ba442d5331f did not go unnoticed, binfmt-support stopped to
work on my Debian system since v5.17-rc2 (did not check with -rc1).
The existance of /proc/sys/fs/binfmt_misc is a precondition for
attempting to mount the binfmt_misc fs, which in turn triggers the
autoload of the binfmt_misc module. Without it, no module is loaded
and no binfmt is available at boot.
Building as built-in or manually loading the module and mounting the fs
works fine, it's therefore only a matter of interaction with user-space.
I could try to improve the Debian systemd configuration but I can't
say anything about the other distributions.
In the meanwhile this patch restores a working system right after boot.
Fixes: 3ba442d5331f ("fs: move binfmt_misc sysctl to its own file")
Signed-off-by: Domenico Andreoli <domenico.andreoli@linux.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Qing Wang <wangqing@vivo.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
---
fs/binfmt_misc.c | 6 +-----
kernel/sysctl.c | 13 +++++++++++++
2 files changed, 14 insertions(+), 5 deletions(-)
Index: b/fs/binfmt_misc.c
===================================================================
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -817,20 +817,16 @@ static struct file_system_type bm_fs_typ
};
MODULE_ALIAS_FS("binfmt_misc");
-static struct ctl_table_header *binfmt_misc_header;
-
static int __init init_misc_binfmt(void)
{
int err = register_filesystem(&bm_fs_type);
if (!err)
insert_binfmt(&misc_format);
- binfmt_misc_header = register_sysctl_mount_point("fs/binfmt_misc");
- return 0;
+ return err;
}
static void __exit exit_misc_binfmt(void)
{
- unregister_sysctl_table(binfmt_misc_header);
unregister_binfmt(&misc_format);
unregister_filesystem(&bm_fs_type);
}
Index: b/kernel/sysctl.c
===================================================================
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2806,6 +2806,17 @@ static struct ctl_table vm_table[] = {
{ }
};
+static struct ctl_table fs_table[] = {
+#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
+ {
+ .procname = "binfmt_misc",
+ .mode = 0555,
+ .child = sysctl_mount_point,
+ },
+#endif
+ { }
+};
+
static struct ctl_table debug_table[] = {
#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
{
@@ -2825,6 +2836,7 @@ static struct ctl_table dev_table[] = {
DECLARE_SYSCTL_BASE(kernel, kern_table);
DECLARE_SYSCTL_BASE(vm, vm_table);
+DECLARE_SYSCTL_BASE(fs, fs_table);
DECLARE_SYSCTL_BASE(debug, debug_table);
DECLARE_SYSCTL_BASE(dev, dev_table);
@@ -2832,6 +2844,7 @@ int __init sysctl_init_bases(void)
{
register_sysctl_base(kernel);
register_sysctl_base(vm);
+ register_sysctl_base(fs);
register_sysctl_base(debug);
register_sysctl_base(dev);
^ permalink raw reply [flat|nested] 83+ messages in thread* Re: [PATCH] Fix regression due to "fs: move binfmt_misc sysctl to its own file"
2022-02-07 13:27 ` [PATCH] Fix regression due to "fs: move binfmt_misc sysctl to its own file" Domenico Andreoli
@ 2022-02-07 21:46 ` Luis Chamberlain
2022-02-07 22:53 ` Tong Zhang
2022-02-08 6:46 ` [PATCH] " Thorsten Leemhuis
1 sibling, 1 reply; 83+ messages in thread
From: Luis Chamberlain @ 2022-02-07 21:46 UTC (permalink / raw)
To: Domenico Andreoli, Tong Zhang, Eric W. Biederman
Cc: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, gregkh, jack, jani.nikula, jani.nikula,
jejb, jlbec, john.ogness, joonas.lahtinen, joseph.qi,
julia.lawall, keescook, kernel, linux-mm, mark, martin.petersen,
mm-commits, nixiaoming, penguin-kernel, peterz, phil, pjt,
pmladek, rafael, rodrigo.vivi, rostedt, senozhatsky, sre, steve,
surenb, torvalds, tytso, viro, wangqing, yzaikin, linux-kernel
On Mon, Feb 07, 2022 at 02:27:28PM +0100, Domenico Andreoli wrote:
> Commit 3ba442d5331f did not go unnoticed, binfmt-support stopped to
> work on my Debian system since v5.17-rc2 (did not check with -rc1).
>
> The existance of /proc/sys/fs/binfmt_misc is a precondition for
> attempting to mount the binfmt_misc fs, which in turn triggers the
> autoload of the binfmt_misc module. Without it, no module is loaded
> and no binfmt is available at boot.
>
> Building as built-in or manually loading the module and mounting the fs
> works fine, it's therefore only a matter of interaction with user-space.
>
> I could try to improve the Debian systemd configuration but I can't
> say anything about the other distributions.
>
> In the meanwhile this patch restores a working system right after boot.
>
> Fixes: 3ba442d5331f ("fs: move binfmt_misc sysctl to its own file")
> Signed-off-by: Domenico Andreoli <domenico.andreoli@linux.com>
> Cc: Al Viro <viro@zeniv.linux.org.uk>
> Cc: Amir Goldstein <amir73il@gmail.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Cc: Antti Palosaari <crope@iki.fi>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Benjamin LaHaise <bcrl@kvack.org>
> Cc: Clemens Ladisch <clemens@ladisch.de>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Douglas Gilbert <dgilbert@interlog.com>
> Cc: Eric Biederman <ebiederm@xmission.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Iurii Zaikin <yzaikin@google.com>
> Cc: James E.J. Bottomley <jejb@linux.ibm.com>
> Cc: Jan Kara <jack@suse.cz>
> Cc: Jani Nikula <jani.nikula@intel.com>
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Joel Becker <jlbec@evilplan.org>
> Cc: John Ogness <john.ogness@linutronix.de>
> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
> Cc: Julia Lawall <julia.lawall@inria.fr>
> Cc: Kees Cook <keescook@chromium.org>
> Cc: Lukas Middendorf <kernel@tuxforce.de>
> Cc: Luis Chamberlain <mcgrof@kernel.org>
> Cc: Mark Fasheh <mark@fasheh.com>
> Cc: Martin K. Petersen <martin.petersen@oracle.com>
> Cc: Paul Turner <pjt@google.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Petr Mladek <pmladek@suse.com>
> Cc: Phillip Potter <phil@philpotter.co.uk>
> Cc: Qing Wang <wangqing@vivo.com>
> Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Cc: Sebastian Reichel <sre@kernel.org>
> Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
> Cc: Stephen Kitt <steve@sk2.org>
> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
> Cc: Suren Baghdasaryan <surenb@google.com>
> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
> Cc: "Theodore Ts'o" <tytso@mit.edu>
> Cc: Xiaoming Ni <nixiaoming@huawei.com>
>
> ---
> fs/binfmt_misc.c | 6 +-----
> kernel/sysctl.c | 13 +++++++++++++
> 2 files changed, 14 insertions(+), 5 deletions(-)
>
> Index: b/fs/binfmt_misc.c
> ===================================================================
> --- a/fs/binfmt_misc.c
> +++ b/fs/binfmt_misc.c
> @@ -817,20 +817,16 @@ static struct file_system_type bm_fs_typ
> };
> MODULE_ALIAS_FS("binfmt_misc");
>
> -static struct ctl_table_header *binfmt_misc_header;
> -
> static int __init init_misc_binfmt(void)
> {
> int err = register_filesystem(&bm_fs_type);
> if (!err)
> insert_binfmt(&misc_format);
> - binfmt_misc_header = register_sysctl_mount_point("fs/binfmt_misc");
> - return 0;
> + return err;
> }
OK I think the issue here should have been that declaring this on
fs/binfmt_misc.c creates the chicken and the egg issue, and so we
need to do this on built-in code. Instead of your patch can you try
this instead, it just always creates the sysctl mount always now
so long as proc sysctl is enabled. It does not do the unregistration
as we always want the path present as it used to be before as well.
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index c07f35719ee3..4b8f1b11a7c8 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -817,20 +817,16 @@ static struct file_system_type bm_fs_type = {
};
MODULE_ALIAS_FS("binfmt_misc");
-static struct ctl_table_header *binfmt_misc_header;
-
static int __init init_misc_binfmt(void)
{
int err = register_filesystem(&bm_fs_type);
if (!err)
insert_binfmt(&misc_format);
- binfmt_misc_header = register_sysctl_mount_point("fs/binfmt_misc");
return 0;
}
static void __exit exit_misc_binfmt(void)
{
- unregister_sysctl_table(binfmt_misc_header);
unregister_binfmt(&misc_format);
unregister_filesystem(&bm_fs_type);
}
diff --git a/fs/file_table.c b/fs/file_table.c
index 57edef16dce4..4f4739c9405c 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -119,6 +119,7 @@ static struct ctl_table fs_stat_sysctls[] = {
static int __init init_fs_stat_sysctls(void)
{
register_sysctl_init("fs", fs_stat_sysctls);
+ register_sysctl_mount_point("fs/binfmt_misc");
return 0;
}
fs_initcall(init_fs_stat_sysctls);
^ permalink raw reply related [flat|nested] 83+ messages in thread* Re: [PATCH] Fix regression due to "fs: move binfmt_misc sysctl to its own file"
2022-02-07 21:46 ` Luis Chamberlain
@ 2022-02-07 22:53 ` Tong Zhang
2022-02-08 17:20 ` Luis Chamberlain
0 siblings, 1 reply; 83+ messages in thread
From: Tong Zhang @ 2022-02-07 22:53 UTC (permalink / raw)
To: Luis Chamberlain
Cc: Domenico Andreoli, Eric W. Biederman, David Airlie,
Andrew Morton, amir73il, Andy Shevchenko, Arnd Bergmann, bcrl,
benh, clemens, crope, dgilbert, Greg KH, jack, jani.nikula,
jani.nikula, James E.J. Bottomley, jlbec, john.ogness,
joonas.lahtinen, Joseph Qi, julia.lawall, Kees Cook, kernel,
Linux Memory Management List, mark, Martin K. Petersen,
mm-commits, nixiaoming, penguin-kernel, peterz, phil, pjt,
pmladek, rafael, rodrigo.vivi, rostedt, senozhatsky, sre, steve,
surenb, torvalds, tytso, Al Viro, wangqing, Iurii Zaikin,
open list
On Mon, Feb 7, 2022 at 1:46 PM Luis Chamberlain <mcgrof@kernel.org> wrote:
>
> OK I think the issue here should have been that declaring this on
> fs/binfmt_misc.c creates the chicken and the egg issue, and so we
> need to do this on built-in code. Instead of your patch can you try
> this instead, it just always creates the sysctl mount always now
> so long as proc sysctl is enabled. It does not do the unregistration
> as we always want the path present as it used to be before as well.
>
> diff --git a/fs/file_table.c b/fs/file_table.c
> index 57edef16dce4..4f4739c9405c 100644
> --- a/fs/file_table.c
> +++ b/fs/file_table.c
> @@ -119,6 +119,7 @@ static struct ctl_table fs_stat_sysctls[] = {
> static int __init init_fs_stat_sysctls(void)
> {
> register_sysctl_init("fs", fs_stat_sysctls);
> + register_sysctl_mount_point("fs/binfmt_misc");
> return 0;
> }
> fs_initcall(init_fs_stat_sysctls);
I'm looking at the original code, and it seems that if we don't select
CONFIG_BINFMT_MISC at all,
this file won't be created. This would suggest an IF MACRO around
> + register_sysctl_mount_point("fs/binfmt_misc");
and it should looks like
+#if IS_ENABLED(CONFIG_BINFMT_MISC)
+ register_sysctl_mount_point("fs/binfmt_misc");
+#endif
or if you prefer original style:
#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
- Tong
^ permalink raw reply [flat|nested] 83+ messages in thread* Re: [PATCH] Fix regression due to "fs: move binfmt_misc sysctl to its own file"
2022-02-07 22:53 ` Tong Zhang
@ 2022-02-08 17:20 ` Luis Chamberlain
2022-02-09 7:31 ` Domenico Andreoli
2022-02-09 7:49 ` [PATCH v2] " Domenico Andreoli
0 siblings, 2 replies; 83+ messages in thread
From: Luis Chamberlain @ 2022-02-08 17:20 UTC (permalink / raw)
To: Tong Zhang
Cc: Domenico Andreoli, Eric W. Biederman, David Airlie,
Andrew Morton, amir73il, Andy Shevchenko, Arnd Bergmann, bcrl,
benh, clemens, crope, dgilbert, Greg KH, jack, jani.nikula,
jani.nikula, James E.J. Bottomley, jlbec, john.ogness,
joonas.lahtinen, Joseph Qi, julia.lawall, Kees Cook, kernel,
Linux Memory Management List, mark, Martin K. Petersen,
mm-commits, nixiaoming, penguin-kernel, peterz, phil, pjt,
pmladek, rafael, rodrigo.vivi, rostedt, senozhatsky, sre, steve,
surenb, torvalds, tytso, Al Viro, wangqing, Iurii Zaikin,
open list
On Mon, Feb 07, 2022 at 02:53:21PM -0800, Tong Zhang wrote:
> On Mon, Feb 7, 2022 at 1:46 PM Luis Chamberlain <mcgrof@kernel.org> wrote:
> >
> > OK I think the issue here should have been that declaring this on
> > fs/binfmt_misc.c creates the chicken and the egg issue, and so we
> > need to do this on built-in code. Instead of your patch can you try
> > this instead, it just always creates the sysctl mount always now
> > so long as proc sysctl is enabled. It does not do the unregistration
> > as we always want the path present as it used to be before as well.
> >
> > diff --git a/fs/file_table.c b/fs/file_table.c
> > index 57edef16dce4..4f4739c9405c 100644
> > --- a/fs/file_table.c
> > +++ b/fs/file_table.c
> > @@ -119,6 +119,7 @@ static struct ctl_table fs_stat_sysctls[] = {
> > static int __init init_fs_stat_sysctls(void)
> > {
> > register_sysctl_init("fs", fs_stat_sysctls);
> > + register_sysctl_mount_point("fs/binfmt_misc");
> > return 0;
> > }
> > fs_initcall(init_fs_stat_sysctls);
>
> I'm looking at the original code, and it seems that if we don't select
> CONFIG_BINFMT_MISC at all,
> this file won't be created. This would suggest an IF MACRO around
> > + register_sysctl_mount_point("fs/binfmt_misc");
> and it should looks like
> +#if IS_ENABLED(CONFIG_BINFMT_MISC)
> + register_sysctl_mount_point("fs/binfmt_misc");
> +#endif
> or if you prefer original style:
> #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
Or better yet using IS_ENABLED() to avoid the ifdef cruft:
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index c07f35719ee3..4b8f1b11a7c8 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -817,20 +817,16 @@ static struct file_system_type bm_fs_type = {
};
MODULE_ALIAS_FS("binfmt_misc");
-static struct ctl_table_header *binfmt_misc_header;
-
static int __init init_misc_binfmt(void)
{
int err = register_filesystem(&bm_fs_type);
if (!err)
insert_binfmt(&misc_format);
- binfmt_misc_header = register_sysctl_mount_point("fs/binfmt_misc");
return 0;
}
static void __exit exit_misc_binfmt(void)
{
- unregister_sysctl_table(binfmt_misc_header);
unregister_binfmt(&misc_format);
unregister_filesystem(&bm_fs_type);
}
diff --git a/fs/file_table.c b/fs/file_table.c
index 57edef16dce4..4969021fa676 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -119,6 +119,8 @@ static struct ctl_table fs_stat_sysctls[] = {
static int __init init_fs_stat_sysctls(void)
{
register_sysctl_init("fs", fs_stat_sysctls);
+ if (IS_ENABLED(CONFIG_BINFMT_MISC))
+ register_sysctl_mount_point("fs/binfmt_misc");
return 0;
}
fs_initcall(init_fs_stat_sysctls);
^ permalink raw reply related [flat|nested] 83+ messages in thread* Re: [PATCH] Fix regression due to "fs: move binfmt_misc sysctl to its own file"
2022-02-08 17:20 ` Luis Chamberlain
@ 2022-02-09 7:31 ` Domenico Andreoli
2022-02-09 7:49 ` [PATCH v2] " Domenico Andreoli
1 sibling, 0 replies; 83+ messages in thread
From: Domenico Andreoli @ 2022-02-09 7:31 UTC (permalink / raw)
To: Luis Chamberlain
Cc: Tong Zhang, Eric W. Biederman, David Airlie, Andrew Morton,
amir73il, Andy Shevchenko, Arnd Bergmann, bcrl, benh, clemens,
crope, dgilbert, Greg KH, jack, jani.nikula, jani.nikula,
James E.J. Bottomley, jlbec, john.ogness, joonas.lahtinen,
Joseph Qi, julia.lawall, Kees Cook, kernel,
Linux Memory Management List, mark, Martin K. Petersen,
mm-commits, nixiaoming, penguin-kernel, peterz, phil, pjt,
pmladek, rafael, rodrigo.vivi, rostedt, senozhatsky, sre, steve,
surenb, torvalds, tytso, Al Viro, wangqing, Iurii Zaikin,
open list
On Tue, Feb 08, 2022 at 09:20:42AM -0800, Luis Chamberlain wrote:
> On Mon, Feb 07, 2022 at 02:53:21PM -0800, Tong Zhang wrote:
> > On Mon, Feb 7, 2022 at 1:46 PM Luis Chamberlain <mcgrof@kernel.org> wrote:
> > >
> > > OK I think the issue here should have been that declaring this on
> > > fs/binfmt_misc.c creates the chicken and the egg issue, and so we
> > > need to do this on built-in code. Instead of your patch can you try
> > > this instead, it just always creates the sysctl mount always now
> > > so long as proc sysctl is enabled. It does not do the unregistration
> > > as we always want the path present as it used to be before as well.
> > >
> > > diff --git a/fs/file_table.c b/fs/file_table.c
> > > index 57edef16dce4..4f4739c9405c 100644
> > > --- a/fs/file_table.c
> > > +++ b/fs/file_table.c
> > > @@ -119,6 +119,7 @@ static struct ctl_table fs_stat_sysctls[] = {
> > > static int __init init_fs_stat_sysctls(void)
> > > {
> > > register_sysctl_init("fs", fs_stat_sysctls);
> > > + register_sysctl_mount_point("fs/binfmt_misc");
> > > return 0;
> > > }
> > > fs_initcall(init_fs_stat_sysctls);
> >
> > I'm looking at the original code, and it seems that if we don't select
> > CONFIG_BINFMT_MISC at all,
> > this file won't be created. This would suggest an IF MACRO around
> > > + register_sysctl_mount_point("fs/binfmt_misc");
> > and it should looks like
> > +#if IS_ENABLED(CONFIG_BINFMT_MISC)
> > + register_sysctl_mount_point("fs/binfmt_misc");
> > +#endif
> > or if you prefer original style:
> > #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
>
> Or better yet using IS_ENABLED() to avoid the ifdef cruft:
>
> diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
> index c07f35719ee3..4b8f1b11a7c8 100644
> --- a/fs/binfmt_misc.c
> +++ b/fs/binfmt_misc.c
> @@ -817,20 +817,16 @@ static struct file_system_type bm_fs_type = {
> };
> MODULE_ALIAS_FS("binfmt_misc");
>
> -static struct ctl_table_header *binfmt_misc_header;
> -
> static int __init init_misc_binfmt(void)
> {
> int err = register_filesystem(&bm_fs_type);
> if (!err)
> insert_binfmt(&misc_format);
> - binfmt_misc_header = register_sysctl_mount_point("fs/binfmt_misc");
> return 0;
> }
>
> static void __exit exit_misc_binfmt(void)
> {
> - unregister_sysctl_table(binfmt_misc_header);
> unregister_binfmt(&misc_format);
> unregister_filesystem(&bm_fs_type);
> }
> diff --git a/fs/file_table.c b/fs/file_table.c
> index 57edef16dce4..4969021fa676 100644
> --- a/fs/file_table.c
> +++ b/fs/file_table.c
> @@ -119,6 +119,8 @@ static struct ctl_table fs_stat_sysctls[] = {
> static int __init init_fs_stat_sysctls(void)
> {
> register_sysctl_init("fs", fs_stat_sysctls);
> + if (IS_ENABLED(CONFIG_BINFMT_MISC))
> + register_sysctl_mount_point("fs/binfmt_misc");
> return 0;
> }
> fs_initcall(init_fs_stat_sysctls);
Apologies for the late reply, I was notified the patch is added to the
mm patchset and thought to be late for any update but now I'm not seeing
it anywhere. Maybe it's been dropped?
Forgot of IS_ENABLED(), I would surely use it in the v2.
Not clear what's the benefit in registering the mount point in
fs/file_table.c vs. kernel/sysctl.c. I'd keep it close to where people
was used to find it, unless there is a good reason otherwise.
Could you please elaborate?
Thanks for your review!
Dom
--
rsa4096: 3B10 0CA1 8674 ACBA B4FE FCD2 CE5B CF17 9960 DE13
ed25519: FFB4 0CC3 7F2E 091D F7DA 356E CC79 2832 ED38 CB05
^ permalink raw reply [flat|nested] 83+ messages in thread* [PATCH v2] Fix regression due to "fs: move binfmt_misc sysctl to its own file"
2022-02-08 17:20 ` Luis Chamberlain
2022-02-09 7:31 ` Domenico Andreoli
@ 2022-02-09 7:49 ` Domenico Andreoli
2022-02-09 7:55 ` Tong Zhang
2022-02-13 15:34 ` Ido Schimmel
1 sibling, 2 replies; 83+ messages in thread
From: Domenico Andreoli @ 2022-02-09 7:49 UTC (permalink / raw)
To: Luis Chamberlain
Cc: Tong Zhang, Eric W. Biederman, David Airlie, Andrew Morton,
amir73il, Andy Shevchenko, Arnd Bergmann, bcrl, benh, clemens,
crope, dgilbert, Greg KH, jack, jani.nikula, jani.nikula,
James E.J. Bottomley, jlbec, john.ogness, joonas.lahtinen,
Joseph Qi, julia.lawall, Kees Cook, kernel,
Linux Memory Management List, mark, Martin K. Petersen,
mm-commits, nixiaoming, penguin-kernel, peterz, phil, pjt,
pmladek, rafael, rodrigo.vivi, rostedt, senozhatsky, sre, steve,
surenb, torvalds, tytso, Al Viro, wangqing, Iurii Zaikin,
open list, regressions
Commit 3ba442d5331f did not go unnoticed, binfmt-support stopped to
work on my Debian system since v5.17-rc2 (did not check with -rc1).
The existance of the /proc/sys/fs/binfmt_misc is a precondition for
attempting to mount the binfmt_misc fs, which in turn triggers the
autoload of the binfmt_misc module. Without it, no module is loaded
and no binfmt is available at boot.
Building as built-in or manually loading the module and mounting the fs
works fine, it's therefore only a matter of interaction with user-space.
I could try to improve the Debian systemd configuration but I can't
say anything about the other distributions.
This patch restores a working system right after boot.
v2:
- move creation of fs/binfmt_misc to fs/file_table.c
- use IS_ENABLED() to conditionally create it
Fixes: 3ba442d5331f ("fs: move binfmt_misc sysctl to its own file")
Signed-off-by: Domenico Andreoli <domenico.andreoli@linux.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Qing Wang <wangqing@vivo.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
---
fs/binfmt_misc.c | 6 +-----
fs/file_table.c | 2 ++
2 files changed, 3 insertions(+), 5 deletions(-)
Index: b/fs/binfmt_misc.c
===================================================================
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -817,20 +817,16 @@ static struct file_system_type bm_fs_typ
};
MODULE_ALIAS_FS("binfmt_misc");
-static struct ctl_table_header *binfmt_misc_header;
-
static int __init init_misc_binfmt(void)
{
int err = register_filesystem(&bm_fs_type);
if (!err)
insert_binfmt(&misc_format);
- binfmt_misc_header = register_sysctl_mount_point("fs/binfmt_misc");
- return 0;
+ return err;
}
static void __exit exit_misc_binfmt(void)
{
- unregister_sysctl_table(binfmt_misc_header);
unregister_binfmt(&misc_format);
unregister_filesystem(&bm_fs_type);
}
Index: b/fs/file_table.c
===================================================================
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -119,6 +119,8 @@ static struct ctl_table fs_stat_sysctls[
static int __init init_fs_stat_sysctls(void)
{
register_sysctl_init("fs", fs_stat_sysctls);
+ if (IS_ENABLED(CONFIG_BINFMT_MISC))
+ register_sysctl_mount_point("fs/binfmt_misc");
return 0;
}
fs_initcall(init_fs_stat_sysctls);
^ permalink raw reply [flat|nested] 83+ messages in thread* Re: [PATCH v2] Fix regression due to "fs: move binfmt_misc sysctl to its own file"
2022-02-09 7:49 ` [PATCH v2] " Domenico Andreoli
@ 2022-02-09 7:55 ` Tong Zhang
2022-02-13 15:34 ` Ido Schimmel
1 sibling, 0 replies; 83+ messages in thread
From: Tong Zhang @ 2022-02-09 7:55 UTC (permalink / raw)
To: Domenico Andreoli
Cc: Luis Chamberlain, Eric W. Biederman, David Airlie, Andrew Morton,
amir73il, Andy Shevchenko, Arnd Bergmann, bcrl, benh, clemens,
crope, dgilbert, Greg KH, jack, jani.nikula, jani.nikula,
James E.J. Bottomley, jlbec, john.ogness, joonas.lahtinen,
Joseph Qi, julia.lawall, Kees Cook, kernel,
Linux Memory Management List, Mark Fasheh, Martin K. Petersen,
mm-commits, nixiaoming, penguin-kernel, peterz, Phillip Potter,
Paul Turner, pmladek, rafael, rodrigo.vivi, rostedt, senozhatsky,
sre, steve, Suren Baghdasaryan, torvalds, tytso, Al Viro,
wangqing, Iurii Zaikin, open list, regressions
On Tue, Feb 8, 2022 at 11:49 PM Domenico Andreoli
<domenico.andreoli@linux.com> wrote:
>
> Commit 3ba442d5331f did not go unnoticed, binfmt-support stopped to
> work on my Debian system since v5.17-rc2 (did not check with -rc1).
>
> The existance of the /proc/sys/fs/binfmt_misc is a precondition for
> attempting to mount the binfmt_misc fs, which in turn triggers the
> autoload of the binfmt_misc module. Without it, no module is loaded
> and no binfmt is available at boot.
>
> Building as built-in or manually loading the module and mounting the fs
> works fine, it's therefore only a matter of interaction with user-space.
> I could try to improve the Debian systemd configuration but I can't
> say anything about the other distributions.
>
> This patch restores a working system right after boot.
>
> v2:
> - move creation of fs/binfmt_misc to fs/file_table.c
> - use IS_ENABLED() to conditionally create it
>
> Fixes: 3ba442d5331f ("fs: move binfmt_misc sysctl to its own file")
> Signed-off-by: Domenico Andreoli <domenico.andreoli@linux.com>
> Cc: Al Viro <viro@zeniv.linux.org.uk>
> Cc: Amir Goldstein <amir73il@gmail.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Cc: Antti Palosaari <crope@iki.fi>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Benjamin LaHaise <bcrl@kvack.org>
> Cc: Clemens Ladisch <clemens@ladisch.de>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Douglas Gilbert <dgilbert@interlog.com>
> Cc: Eric Biederman <ebiederm@xmission.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Iurii Zaikin <yzaikin@google.com>
> Cc: James E.J. Bottomley <jejb@linux.ibm.com>
> Cc: Jan Kara <jack@suse.cz>
> Cc: Jani Nikula <jani.nikula@intel.com>
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Joel Becker <jlbec@evilplan.org>
> Cc: John Ogness <john.ogness@linutronix.de>
> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
> Cc: Julia Lawall <julia.lawall@inria.fr>
> Cc: Kees Cook <keescook@chromium.org>
> Cc: Lukas Middendorf <kernel@tuxforce.de>
> Cc: Mark Fasheh <mark@fasheh.com>
> Cc: Martin K. Petersen <martin.petersen@oracle.com>
> Cc: Paul Turner <pjt@google.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Petr Mladek <pmladek@suse.com>
> Cc: Phillip Potter <phil@philpotter.co.uk>
> Cc: Qing Wang <wangqing@vivo.com>
> Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Cc: Sebastian Reichel <sre@kernel.org>
> Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
> Cc: Stephen Kitt <steve@sk2.org>
> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
> Cc: Suren Baghdasaryan <surenb@google.com>
> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
> Cc: "Theodore Ts'o" <tytso@mit.edu>
> Cc: Xiaoming Ni <nixiaoming@huawei.com>
>
> ---
> fs/binfmt_misc.c | 6 +-----
> fs/file_table.c | 2 ++
> 2 files changed, 3 insertions(+), 5 deletions(-)
>
> Index: b/fs/binfmt_misc.c
> ===================================================================
> --- a/fs/binfmt_misc.c
> +++ b/fs/binfmt_misc.c
> @@ -817,20 +817,16 @@ static struct file_system_type bm_fs_typ
> };
> MODULE_ALIAS_FS("binfmt_misc");
>
> -static struct ctl_table_header *binfmt_misc_header;
> -
> static int __init init_misc_binfmt(void)
> {
> int err = register_filesystem(&bm_fs_type);
> if (!err)
> insert_binfmt(&misc_format);
> - binfmt_misc_header = register_sysctl_mount_point("fs/binfmt_misc");
> - return 0;
> + return err;
> }
>
> static void __exit exit_misc_binfmt(void)
> {
> - unregister_sysctl_table(binfmt_misc_header);
> unregister_binfmt(&misc_format);
> unregister_filesystem(&bm_fs_type);
> }
> Index: b/fs/file_table.c
> ===================================================================
> --- a/fs/file_table.c
> +++ b/fs/file_table.c
> @@ -119,6 +119,8 @@ static struct ctl_table fs_stat_sysctls[
> static int __init init_fs_stat_sysctls(void)
> {
> register_sysctl_init("fs", fs_stat_sysctls);
> + if (IS_ENABLED(CONFIG_BINFMT_MISC))
> + register_sysctl_mount_point("fs/binfmt_misc");
> return 0;
> }
> fs_initcall(init_fs_stat_sysctls);
Looks good
Thanks!
Reviewed-by: Tong Zhang <ztong0001@gmail.com>
^ permalink raw reply [flat|nested] 83+ messages in thread* Re: [PATCH v2] Fix regression due to "fs: move binfmt_misc sysctl to its own file"
2022-02-09 7:49 ` [PATCH v2] " Domenico Andreoli
2022-02-09 7:55 ` Tong Zhang
@ 2022-02-13 15:34 ` Ido Schimmel
2022-02-13 21:09 ` Tong Zhang
2022-02-13 21:10 ` Tong Zhang
1 sibling, 2 replies; 83+ messages in thread
From: Ido Schimmel @ 2022-02-13 15:34 UTC (permalink / raw)
To: Domenico Andreoli
Cc: Luis Chamberlain, Tong Zhang, Eric W. Biederman, David Airlie,
Andrew Morton, amir73il, Andy Shevchenko, Arnd Bergmann, bcrl,
benh, clemens, crope, dgilbert, Greg KH, jack, jani.nikula,
jani.nikula, James E.J. Bottomley, jlbec, john.ogness,
joonas.lahtinen, Joseph Qi, julia.lawall, Kees Cook, kernel,
Linux Memory Management List, mark, Martin K. Petersen,
mm-commits, nixiaoming, penguin-kernel, peterz, phil, pjt,
pmladek, rafael, rodrigo.vivi, rostedt, senozhatsky, sre, steve,
surenb, torvalds, tytso, Al Viro, wangqing, Iurii Zaikin,
open list, regressions
On Wed, Feb 09, 2022 at 08:49:20AM +0100, Domenico Andreoli wrote:
> fs/binfmt_misc.c | 6 +-----
> fs/file_table.c | 2 ++
> 2 files changed, 3 insertions(+), 5 deletions(-)
>
> Index: b/fs/binfmt_misc.c
> ===================================================================
> --- a/fs/binfmt_misc.c
> +++ b/fs/binfmt_misc.c
> @@ -817,20 +817,16 @@ static struct file_system_type bm_fs_typ
> };
> MODULE_ALIAS_FS("binfmt_misc");
>
> -static struct ctl_table_header *binfmt_misc_header;
> -
> static int __init init_misc_binfmt(void)
> {
> int err = register_filesystem(&bm_fs_type);
> if (!err)
> insert_binfmt(&misc_format);
> - binfmt_misc_header = register_sysctl_mount_point("fs/binfmt_misc");
> - return 0;
> + return err;
> }
>
> static void __exit exit_misc_binfmt(void)
> {
> - unregister_sysctl_table(binfmt_misc_header);
> unregister_binfmt(&misc_format);
> unregister_filesystem(&bm_fs_type);
> }
> Index: b/fs/file_table.c
> ===================================================================
> --- a/fs/file_table.c
> +++ b/fs/file_table.c
> @@ -119,6 +119,8 @@ static struct ctl_table fs_stat_sysctls[
> static int __init init_fs_stat_sysctls(void)
> {
> register_sysctl_init("fs", fs_stat_sysctls);
> + if (IS_ENABLED(CONFIG_BINFMT_MISC))
> + register_sysctl_mount_point("fs/binfmt_misc");
Hi,
kmemleak complains about this:
# cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff8881045fea88 (size 96):
comm "swapper/0", pid 1, jiffies 4294669355 (age 167.804s)
hex dump (first 32 bytes):
e0 c8 07 88 ff ff ff ff 00 00 00 00 01 00 00 00 ................
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff81d11637>] __register_sysctl_table+0x117/0x1150
[<ffffffff86c3600f>] init_fs_stat_sysctls+0x30/0x33
[<ffffffff81002558>] do_one_initcall+0x108/0x690
[<ffffffff86bca8bd>] kernel_init_freeable+0x45a/0x4de
[<ffffffff83e0757f>] kernel_init+0x1f/0x220
[<ffffffff810048cf>] ret_from_fork+0x1f/0x30
> return 0;
> }
> fs_initcall(init_fs_stat_sysctls);
>
^ permalink raw reply [flat|nested] 83+ messages in thread* Re: [PATCH v2] Fix regression due to "fs: move binfmt_misc sysctl to its own file"
2022-02-13 15:34 ` Ido Schimmel
@ 2022-02-13 21:09 ` Tong Zhang
2022-02-13 21:10 ` Tong Zhang
1 sibling, 0 replies; 83+ messages in thread
From: Tong Zhang @ 2022-02-13 21:09 UTC (permalink / raw)
To: Ido Schimmel
Cc: Domenico Andreoli, Luis Chamberlain, Eric W. Biederman,
David Airlie, Andrew Morton, amir73il, Andy Shevchenko,
Arnd Bergmann, bcrl, benh, clemens, crope, dgilbert, Greg KH,
jack, jani.nikula, jani.nikula, James E.J. Bottomley, jlbec,
john.ogness, joonas.lahtinen, Joseph Qi, julia.lawall, Kees Cook,
kernel, Linux Memory Management List, mark, Martin K. Petersen,
mm-commits, nixiaoming, penguin-kernel, peterz, phil, pjt,
pmladek, rafael, rodrigo.vivi, rostedt, senozhatsky, sre, steve,
surenb, torvalds, tytso, Al Viro, wangqing, Iurii Zaikin,
open list, regressions
[-- Attachment #1: Type: text/plain, Size: 2531 bytes --]
> On Feb 13, 2022, at 7:34 AM, Ido Schimmel <idosch@idosch.org> wrote:
>
> On Wed, Feb 09, 2022 at 08:49:20AM +0100, Domenico Andreoli wrote:
>> fs/binfmt_misc.c | 6 +-----
>> fs/file_table.c | 2 ++
>> 2 files changed, 3 insertions(+), 5 deletions(-)
>>
>> Index: b/fs/binfmt_misc.c
>> ===================================================================
>> --- a/fs/binfmt_misc.c
>> +++ b/fs/binfmt_misc.c
>> @@ -817,20 +817,16 @@ static struct file_system_type bm_fs_typ
>> };
>> MODULE_ALIAS_FS("binfmt_misc");
>>
>> -static struct ctl_table_header *binfmt_misc_header;
>> -
>> static int __init init_misc_binfmt(void)
>> {
>> int err = register_filesystem(&bm_fs_type);
>> if (!err)
>> insert_binfmt(&misc_format);
>> - binfmt_misc_header = register_sysctl_mount_point("fs/binfmt_misc");
>> - return 0;
>> + return err;
>> }
>>
>> static void __exit exit_misc_binfmt(void)
>> {
>> - unregister_sysctl_table(binfmt_misc_header);
>> unregister_binfmt(&misc_format);
>> unregister_filesystem(&bm_fs_type);
>> }
>> Index: b/fs/file_table.c
>> ===================================================================
>> --- a/fs/file_table.c
>> +++ b/fs/file_table.c
>> @@ -119,6 +119,8 @@ static struct ctl_table fs_stat_sysctls[
>> static int __init init_fs_stat_sysctls(void)
>> {
>> register_sysctl_init("fs", fs_stat_sysctls);
>> + if (IS_ENABLED(CONFIG_BINFMT_MISC))
>> + register_sysctl_mount_point("fs/binfmt_misc");
>
> Hi,
>
> kmemleak complains about this:
>
> # cat /sys/kernel/debug/kmemleak
> unreferenced object 0xffff8881045fea88 (size 96):
> comm "swapper/0", pid 1, jiffies 4294669355 (age 167.804s)
> hex dump (first 32 bytes):
> e0 c8 07 88 ff ff ff ff 00 00 00 00 01 00 00 00 ................
> 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<ffffffff81d11637>] __register_sysctl_table+0x117/0x1150
> [<ffffffff86c3600f>] init_fs_stat_sysctls+0x30/0x33
> [<ffffffff81002558>] do_one_initcall+0x108/0x690
> [<ffffffff86bca8bd>] kernel_init_freeable+0x45a/0x4de
> [<ffffffff83e0757f>] kernel_init+0x1f/0x220
> [<ffffffff810048cf>] ret_from_fork+0x1f/0x30
>
>> return 0;
>> }
>> fs_initcall(init_fs_stat_sysctls);
Hi Ido,
Thanks for the report. This is a known issue. The fix is proposed here.
https://lore.kernel.org/all/YgRbEG21AUrLSFKX@bombadil.infradead.org/ <https://lore.kernel.org/all/YgRbEG21AUrLSFKX@bombadil.infradead.org/>
Thanks,
- Tong
[-- Attachment #2: Type: text/html, Size: 18202 bytes --]
^ permalink raw reply [flat|nested] 83+ messages in thread* Re: [PATCH v2] Fix regression due to "fs: move binfmt_misc sysctl to its own file"
2022-02-13 15:34 ` Ido Schimmel
2022-02-13 21:09 ` Tong Zhang
@ 2022-02-13 21:10 ` Tong Zhang
2022-02-14 7:47 ` Ido Schimmel
1 sibling, 1 reply; 83+ messages in thread
From: Tong Zhang @ 2022-02-13 21:10 UTC (permalink / raw)
To: Ido Schimmel
Cc: Domenico Andreoli, Luis Chamberlain, Eric W. Biederman,
David Airlie, Andrew Morton, amir73il, Andy Shevchenko,
Arnd Bergmann, bcrl, benh, clemens, crope, dgilbert, Greg KH,
jack, jani.nikula, Jani Nikula, James E.J. Bottomley, jlbec,
john.ogness, Joonas Lahtinen, Joseph Qi, julia.lawall, Kees Cook,
kernel, Linux Memory Management List, Mark Fasheh,
Martin K. Petersen, mm-commits, nixiaoming, penguin-kernel,
peterz, Phillip Potter, Paul Turner, pmladek, rafael,
Rodrigo Vivi, rostedt, senozhatsky, sre, steve,
Suren Baghdasaryan, Linus Torvalds, tytso, Al Viro, wangqing,
Iurii Zaikin, open list, regressions
On Sun, Feb 13, 2022 at 7:34 AM Ido Schimmel <idosch@idosch.org> wrote:
>
> On Wed, Feb 09, 2022 at 08:49:20AM +0100, Domenico Andreoli wrote:
> > fs/binfmt_misc.c | 6 +-----
> > fs/file_table.c | 2 ++
> > 2 files changed, 3 insertions(+), 5 deletions(-)
> >
> > Index: b/fs/binfmt_misc.c
> > ===================================================================
> > --- a/fs/binfmt_misc.c
> > +++ b/fs/binfmt_misc.c
> > @@ -817,20 +817,16 @@ static struct file_system_type bm_fs_typ
> > };
> > MODULE_ALIAS_FS("binfmt_misc");
> >
> > -static struct ctl_table_header *binfmt_misc_header;
> > -
> > static int __init init_misc_binfmt(void)
> > {
> > int err = register_filesystem(&bm_fs_type);
> > if (!err)
> > insert_binfmt(&misc_format);
> > - binfmt_misc_header = register_sysctl_mount_point("fs/binfmt_misc");
> > - return 0;
> > + return err;
> > }
> >
> > static void __exit exit_misc_binfmt(void)
> > {
> > - unregister_sysctl_table(binfmt_misc_header);
> > unregister_binfmt(&misc_format);
> > unregister_filesystem(&bm_fs_type);
> > }
> > Index: b/fs/file_table.c
> > ===================================================================
> > --- a/fs/file_table.c
> > +++ b/fs/file_table.c
> > @@ -119,6 +119,8 @@ static struct ctl_table fs_stat_sysctls[
> > static int __init init_fs_stat_sysctls(void)
> > {
> > register_sysctl_init("fs", fs_stat_sysctls);
> > + if (IS_ENABLED(CONFIG_BINFMT_MISC))
> > + register_sysctl_mount_point("fs/binfmt_misc");
>
> Hi,
>
> kmemleak complains about this:
>
> # cat /sys/kernel/debug/kmemleak
> unreferenced object 0xffff8881045fea88 (size 96):
> comm "swapper/0", pid 1, jiffies 4294669355 (age 167.804s)
> hex dump (first 32 bytes):
> e0 c8 07 88 ff ff ff ff 00 00 00 00 01 00 00 00 ................
> 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<ffffffff81d11637>] __register_sysctl_table+0x117/0x1150
> [<ffffffff86c3600f>] init_fs_stat_sysctls+0x30/0x33
> [<ffffffff81002558>] do_one_initcall+0x108/0x690
> [<ffffffff86bca8bd>] kernel_init_freeable+0x45a/0x4de
> [<ffffffff83e0757f>] kernel_init+0x1f/0x220
> [<ffffffff810048cf>] ret_from_fork+0x1f/0x30
>
> > return 0;
> > }
> > fs_initcall(init_fs_stat_sysctls);
> >
Hi Ido,
Thanks for the report. This is a known issue. The fix is proposed here.
https://lore.kernel.org/all/YgRbEG21AUrLSFKX@bombadil.infradead.org/
Thanks,
- Tong
^ permalink raw reply [flat|nested] 83+ messages in thread* Re: [PATCH v2] Fix regression due to "fs: move binfmt_misc sysctl to its own file"
2022-02-13 21:10 ` Tong Zhang
@ 2022-02-14 7:47 ` Ido Schimmel
0 siblings, 0 replies; 83+ messages in thread
From: Ido Schimmel @ 2022-02-14 7:47 UTC (permalink / raw)
To: Tong Zhang
Cc: Domenico Andreoli, Luis Chamberlain, Eric W. Biederman,
David Airlie, Andrew Morton, amir73il, Andy Shevchenko,
Arnd Bergmann, bcrl, benh, clemens, crope, dgilbert, Greg KH,
jack, jani.nikula, Jani Nikula, James E.J. Bottomley, jlbec,
john.ogness, Joonas Lahtinen, Joseph Qi, julia.lawall, Kees Cook,
kernel, Linux Memory Management List, Mark Fasheh,
Martin K. Petersen, mm-commits, nixiaoming, penguin-kernel,
peterz, Phillip Potter, Paul Turner, pmladek, rafael,
Rodrigo Vivi, rostedt, senozhatsky, sre, steve,
Suren Baghdasaryan, Linus Torvalds, tytso, Al Viro, wangqing,
Iurii Zaikin, open list, regressions
On Sun, Feb 13, 2022 at 01:10:42PM -0800, Tong Zhang wrote:
> Hi Ido,
> Thanks for the report. This is a known issue. The fix is proposed here.
> https://lore.kernel.org/all/YgRbEG21AUrLSFKX@bombadil.infradead.org/
Great, thanks for letting me know
^ permalink raw reply [flat|nested] 83+ messages in thread
* Re: [PATCH] Fix regression due to "fs: move binfmt_misc sysctl to its own file"
2022-02-07 13:27 ` [PATCH] Fix regression due to "fs: move binfmt_misc sysctl to its own file" Domenico Andreoli
2022-02-07 21:46 ` Luis Chamberlain
@ 2022-02-08 6:46 ` Thorsten Leemhuis
2022-02-10 9:50 ` [PATCH] Fix regression due to "fs: move binfmt_misc sysctl to its own file" #forregzbot Thorsten Leemhuis
1 sibling, 1 reply; 83+ messages in thread
From: Thorsten Leemhuis @ 2022-02-08 6:46 UTC (permalink / raw)
To: Domenico Andreoli, airlied, akpm, amir73il, andriy.shevchenko,
arnd, bcrl, benh, clemens, crope, dgilbert, ebiederm, gregkh,
jack, jani.nikula, jani.nikula, jejb, jlbec, john.ogness,
joonas.lahtinen, joseph.qi, julia.lawall, keescook, kernel,
linux-mm, mark, martin.petersen, mcgrof, mm-commits, nixiaoming,
penguin-kernel, peterz, phil, pjt, pmladek, rafael, rodrigo.vivi,
rostedt, senozhatsky, sre, steve, surenb, torvalds, tytso, viro,
wangqing, yzaikin
Cc: linux-kernel, regressions
[TLDR: I'm adding the regression report below to regzbot, the Linux
kernel regression tracking bot; all text you find below is compiled from
a few templates paragraphs you might have encountered already already
from similar mails.]
Hi, this is your Linux kernel regression tracker speaking.
CCing the regression mailing list, as it should be in the loop for all
regressions, as explained here:
https://www.kernel.org/doc/html/latest/admin-guide/reporting-issues.html
On 07.02.22 14:27, Domenico Andreoli wrote:
> Commit 3ba442d5331f did not go unnoticed, binfmt-support stopped to
> work on my Debian system since v5.17-rc2 (did not check with -rc1).
>
> The existance of /proc/sys/fs/binfmt_misc is a precondition for
> attempting to mount the binfmt_misc fs, which in turn triggers the
> autoload of the binfmt_misc module. Without it, no module is loaded
> and no binfmt is available at boot.
>
> Building as built-in or manually loading the module and mounting the fs
> works fine, it's therefore only a matter of interaction with user-space.
>
> I could try to improve the Debian systemd configuration but I can't
> say anything about the other distributions.
>
> In the meanwhile this patch restores a working system right after boot.
> [...]
To be sure this issue doesn't fall through the cracks unnoticed, I'm
adding it to regzbot, my Linux kernel regression tracking bot:
#regzbot ^introduced 3ba442d5331f
#regzbot title binfmt-support stopped to work
#regzbot ignore-activity
Reminder for developers: when fixing the issue, please add a 'Link:'
tags pointing to the report (the mail quoted above) using
lore.kernel.org/r/, as explained in
'Documentation/process/submitting-patches.rst' and
'Documentation/process/5.Posting.rst'. This allows the bot to connect
the report with any patches posted or committed to fix the issue; this
again allows the bot to show the current status of regressions and
automatically resolve the issue when the fix hits the right tree.
I'm sending this to everyone that got the initial report, to make them
aware of the tracking. I also hope that messages like this motivate
people to directly get at least the regression mailing list and ideally
even regzbot involved when dealing with regressions, as messages like
this wouldn't be needed then.
Don't worry, I'll send further messages wrt to this regression just to
the lists (with a tag in the subject so people can filter them away), if
they are relevant just for regzbot. With a bit of luck no such messages
will be needed anyway.
Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
P.S.: As the Linux kernel's regression tracker I'm getting a lot of
reports on my table. I can only look briefly into most of them and lack
knowledge about most of the areas they concern. I thus unfortunately
will sometimes get things wrong or miss something important. I hope
that's not the case here; if you think it is, don't hesitate to tell me
in a public reply, it's in everyone's interest to set the public record
straight.
--
Additional information about regzbot:
If you want to know more about regzbot, check out its web-interface, the
getting start guide, and the references documentation:
https://linux-regtracking.leemhuis.info/regzbot/
https://gitlab.com/knurd42/regzbot/-/blob/main/docs/getting_started.md
https://gitlab.com/knurd42/regzbot/-/blob/main/docs/reference.md
The last two documents will explain how you can interact with regzbot
yourself if your want to.
Hint for reporters: when reporting a regression it's in your interest to
CC the regression list and tell regzbot about the issue, as that ensures
the regression makes it onto the radar of the Linux kernel's regression
tracker -- that's in your interest, as it ensures your report won't fall
through the cracks unnoticed.
Hint for developers: you normally don't need to care about regzbot once
it's involved. Fix the issue as you normally would, just remember to
include 'Link:' tag in the patch descriptions pointing to all reports
about the issue. This has been expected from developers even before
regzbot showed up for reasons explained in
'Documentation/process/submitting-patches.rst' and
'Documentation/process/5.Posting.rst'.
^ permalink raw reply [flat|nested] 83+ messages in thread
* Re: [PATCH] Fix regression due to "fs: move binfmt_misc sysctl to its own file" #forregzbot
2022-02-08 6:46 ` [PATCH] " Thorsten Leemhuis
@ 2022-02-10 9:50 ` Thorsten Leemhuis
0 siblings, 0 replies; 83+ messages in thread
From: Thorsten Leemhuis @ 2022-02-10 9:50 UTC (permalink / raw)
To: regressions, Domenico Andreoli
For the record:
Sadly the fix for below regression didn't link to the report, as
explained by 'Documentation/process/submitting-patches.rst' and
'Documentation/process/5.Posting.rst'. So I have to tell regzbot about
the fix manually:
#regzbot fixed-by: b42bc9a3c5115c
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=master&id=b42bc9a3c5115c3102a4923776bbeed3b191f2db
Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
P.S.: As the Linux kernel's regression tracker I'm getting a lot of
reports on my table. I can only look briefly into most of them and lack
knowledge about most of the areas they concern. I thus unfortunately
will sometimes get things wrong or miss something important. I hope
that's not the case here; if you think it is, don't hesitate to tell me
in a public reply, it's in everyone's interest to set the public record
straight.
TWIMC: this mail is primarily send for documentation purposes and for
regzbot, my Linux kernel regression tracking bot. These mails usually
contain '#forregzbot' in the subject, to make them easy to spot and filter.
On 08.02.22 07:46, Thorsten Leemhuis wrote:
>
> [TLDR: I'm adding the regression report below to regzbot, the Linux
> kernel regression tracking bot; all text you find below is compiled from
> a few templates paragraphs you might have encountered already already
> from similar mails.]
>
> Hi, this is your Linux kernel regression tracker speaking.
>
> CCing the regression mailing list, as it should be in the loop for all
> regressions, as explained here:
> https://www.kernel.org/doc/html/latest/admin-guide/reporting-issues.html
>
> On 07.02.22 14:27, Domenico Andreoli wrote:
>> Commit 3ba442d5331f did not go unnoticed, binfmt-support stopped to
>> work on my Debian system since v5.17-rc2 (did not check with -rc1).
>>
>> The existance of /proc/sys/fs/binfmt_misc is a precondition for
>> attempting to mount the binfmt_misc fs, which in turn triggers the
>> autoload of the binfmt_misc module. Without it, no module is loaded
>> and no binfmt is available at boot.
>>
>> Building as built-in or manually loading the module and mounting the fs
>> works fine, it's therefore only a matter of interaction with user-space.
>>
>> I could try to improve the Debian systemd configuration but I can't
>> say anything about the other distributions.
>>
>> In the meanwhile this patch restores a working system right after boot.
>> [...]
>
> To be sure this issue doesn't fall through the cracks unnoticed, I'm
> adding it to regzbot, my Linux kernel regression tracking bot:
>
> #regzbot ^introduced 3ba442d5331f
> #regzbot title binfmt-support stopped to work
> #regzbot ignore-activity
>
> Reminder for developers: when fixing the issue, please add a 'Link:'
> tags pointing to the report (the mail quoted above) using
> lore.kernel.org/r/, as explained in
> 'Documentation/process/submitting-patches.rst' and
> 'Documentation/process/5.Posting.rst'. This allows the bot to connect
> the report with any patches posted or committed to fix the issue; this
> again allows the bot to show the current status of regressions and
> automatically resolve the issue when the fix hits the right tree.
>
> I'm sending this to everyone that got the initial report, to make them
> aware of the tracking. I also hope that messages like this motivate
> people to directly get at least the regression mailing list and ideally
> even regzbot involved when dealing with regressions, as messages like
> this wouldn't be needed then.
>
> Don't worry, I'll send further messages wrt to this regression just to
> the lists (with a tag in the subject so people can filter them away), if
> they are relevant just for regzbot. With a bit of luck no such messages
> will be needed anyway.
>
> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
>
> P.S.: As the Linux kernel's regression tracker I'm getting a lot of
> reports on my table. I can only look briefly into most of them and lack
> knowledge about most of the areas they concern. I thus unfortunately
> will sometimes get things wrong or miss something important. I hope
> that's not the case here; if you think it is, don't hesitate to tell me
> in a public reply, it's in everyone's interest to set the public record
> straight.
>
^ permalink raw reply [flat|nested] 83+ messages in thread
* [patch 23/69] printk: move printk sysctl to printk/sysctl.c
2022-01-22 6:10 incoming Andrew Morton
` (21 preceding siblings ...)
2022-01-22 6:12 ` [patch 22/69] fs: move binfmt_misc sysctl to its own file Andrew Morton
@ 2022-01-22 6:12 ` Andrew Morton
2022-01-22 6:12 ` [patch 24/69] scsi/sg: move sg-big-buff sysctl to scsi/sg.c Andrew Morton
` (45 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:12 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: printk: move printk sysctl to printk/sysctl.c
kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
So move printk sysctl from kernel/sysctl.c to kernel/printk/sysctl.c. Use
register_sysctl() to register the sysctl interface.
[mcgrof@kernel.org: fixed compile issues when PRINTK is not set, commit log update]
Link: https://lkml.kernel.org/r/20211124231435.1445213-6-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Qing Wang <wangqing@vivo.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
kernel/printk/Makefile | 5 +-
kernel/printk/internal.h | 6 ++
kernel/printk/printk.c | 1
kernel/printk/sysctl.c | 85 +++++++++++++++++++++++++++++++++++++
kernel/sysctl.c | 68 -----------------------------
5 files changed, 96 insertions(+), 69 deletions(-)
--- a/kernel/printk/internal.h~printk-move-printk-sysctl-to-printk-sysctlc
+++ a/kernel/printk/internal.h
@@ -4,6 +4,12 @@
*/
#include <linux/percpu.h>
+#if defined(CONFIG_PRINTK) && defined(CONFIG_SYSCTL)
+void __init printk_sysctl_init(void);
+#else
+#define printk_sysctl_init() do { } while (0)
+#endif
+
#ifdef CONFIG_PRINTK
/* Flags for a single printk record. */
--- a/kernel/printk/Makefile~printk-move-printk-sysctl-to-printk-sysctlc
+++ a/kernel/printk/Makefile
@@ -2,5 +2,8 @@
obj-y = printk.o
obj-$(CONFIG_PRINTK) += printk_safe.o
obj-$(CONFIG_A11Y_BRAILLE_CONSOLE) += braille.o
-obj-$(CONFIG_PRINTK) += printk_ringbuffer.o
obj-$(CONFIG_PRINTK_INDEX) += index.o
+
+obj-$(CONFIG_PRINTK) += printk_support.o
+printk_support-y := printk_ringbuffer.o
+printk_support-$(CONFIG_SYSCTL) += sysctl.o
--- a/kernel/printk/printk.c~printk-move-printk-sysctl-to-printk-sysctlc
+++ a/kernel/printk/printk.c
@@ -3211,6 +3211,7 @@ static int __init printk_late_init(void)
ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "printk:online",
console_cpu_notify, NULL);
WARN_ON(ret < 0);
+ printk_sysctl_init();
return 0;
}
late_initcall(printk_late_init);
--- /dev/null
+++ a/kernel/printk/sysctl.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * sysctl.c: General linux system control interface
+ */
+
+#include <linux/sysctl.h>
+#include <linux/printk.h>
+#include <linux/capability.h>
+#include <linux/ratelimit.h>
+#include "internal.h"
+
+static const int ten_thousand = 10000;
+
+static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ if (write && !capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+}
+
+static struct ctl_table printk_sysctls[] = {
+ {
+ .procname = "printk",
+ .data = &console_loglevel,
+ .maxlen = 4*sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "printk_ratelimit",
+ .data = &printk_ratelimit_state.interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "printk_ratelimit_burst",
+ .data = &printk_ratelimit_state.burst,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "printk_delay",
+ .data = &printk_delay_msec,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = (void *)&ten_thousand,
+ },
+ {
+ .procname = "printk_devkmsg",
+ .data = devkmsg_log_str,
+ .maxlen = DEVKMSG_STR_MAX_SIZE,
+ .mode = 0644,
+ .proc_handler = devkmsg_sysctl_set_loglvl,
+ },
+ {
+ .procname = "dmesg_restrict",
+ .data = &dmesg_restrict,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax_sysadmin,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+ {
+ .procname = "kptr_restrict",
+ .data = &kptr_restrict,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax_sysadmin,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_TWO,
+ },
+ {}
+};
+
+void __init printk_sysctl_init(void)
+{
+ register_sysctl_init("kernel", printk_sysctls);
+}
--- a/kernel/sysctl.c~printk-move-printk-sysctl-to-printk-sysctlc
+++ a/kernel/sysctl.c
@@ -908,17 +908,6 @@ static int proc_taint(struct ctl_table *
return err;
}
-#ifdef CONFIG_PRINTK
-static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
-{
- if (write && !capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
-}
-#endif
-
/**
* struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
* @min: pointer to minimum allowable value
@@ -2210,63 +2199,6 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = proc_doulongvec_minmax,
},
-#if defined CONFIG_PRINTK
- {
- .procname = "printk",
- .data = &console_loglevel,
- .maxlen = 4*sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "printk_ratelimit",
- .data = &printk_ratelimit_state.interval,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- {
- .procname = "printk_ratelimit_burst",
- .data = &printk_ratelimit_state.burst,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "printk_delay",
- .data = &printk_delay_msec,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = (void *)&ten_thousand,
- },
- {
- .procname = "printk_devkmsg",
- .data = devkmsg_log_str,
- .maxlen = DEVKMSG_STR_MAX_SIZE,
- .mode = 0644,
- .proc_handler = devkmsg_sysctl_set_loglvl,
- },
- {
- .procname = "dmesg_restrict",
- .data = &dmesg_restrict,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax_sysadmin,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- {
- .procname = "kptr_restrict",
- .data = &kptr_restrict,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax_sysadmin,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_TWO,
- },
-#endif
{
.procname = "ngroups_max",
.data = (void *)&ngroups_max,
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 24/69] scsi/sg: move sg-big-buff sysctl to scsi/sg.c
2022-01-22 6:10 incoming Andrew Morton
` (22 preceding siblings ...)
2022-01-22 6:12 ` [patch 23/69] printk: move printk sysctl to printk/sysctl.c Andrew Morton
@ 2022-01-22 6:12 ` Andrew Morton
2022-01-22 6:12 ` [patch 25/69] stackleak: move stack_erasing sysctl to stackleak.c Andrew Morton
` (44 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:12 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: scsi/sg: move sg-big-buff sysctl to scsi/sg.c
kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
So move the sg-big-buff sysctl from kernel/sysctl.c to drivers/scsi/sg.c
and use register_sysctl() to register the sysctl interface.
[mcgrof@kernel.org: commit log update]
Link: https://lkml.kernel.org/r/20211124231435.1445213-7-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Qing Wang <wangqing@vivo.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
drivers/scsi/sg.c | 35 ++++++++++++++++++++++++++++++++++-
include/scsi/sg.h | 4 ----
kernel/sysctl.c | 12 ------------
3 files changed, 34 insertions(+), 17 deletions(-)
--- a/drivers/scsi/sg.c~scsi-sg-move-sg-big-buff-sysctl-to-scsi-sgc
+++ a/drivers/scsi/sg.c
@@ -77,7 +77,7 @@ static int sg_proc_init(void);
#define SG_DEFAULT_TIMEOUT mult_frac(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
-int sg_big_buff = SG_DEF_RESERVED_SIZE;
+static int sg_big_buff = SG_DEF_RESERVED_SIZE;
/* N.B. This variable is readable and writeable via
/proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
of this size (or less if there is not enough memory) will be reserved
@@ -1634,6 +1634,37 @@ MODULE_PARM_DESC(scatter_elem_sz, "scatt
MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
+#ifdef CONFIG_SYSCTL
+#include <linux/sysctl.h>
+
+static struct ctl_table sg_sysctls[] = {
+ {
+ .procname = "sg-big-buff",
+ .data = &sg_big_buff,
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = proc_dointvec,
+ },
+ {}
+};
+
+static struct ctl_table_header *hdr;
+static void register_sg_sysctls(void)
+{
+ if (!hdr)
+ hdr = register_sysctl("kernel", sg_sysctls);
+}
+
+static void unregister_sg_sysctls(void)
+{
+ if (hdr)
+ unregister_sysctl_table(hdr);
+}
+#else
+#define register_sg_sysctls() do { } while (0)
+#define unregister_sg_sysctls() do { } while (0)
+#endif /* CONFIG_SYSCTL */
+
static int __init
init_sg(void)
{
@@ -1666,6 +1697,7 @@ init_sg(void)
return 0;
}
class_destroy(sg_sysfs_class);
+ register_sg_sysctls();
err_out:
unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
return rc;
@@ -1674,6 +1706,7 @@ err_out:
static void __exit
exit_sg(void)
{
+ unregister_sg_sysctls();
#ifdef CONFIG_SCSI_PROC_FS
remove_proc_subtree("scsi/sg", NULL);
#endif /* CONFIG_SCSI_PROC_FS */
--- a/include/scsi/sg.h~scsi-sg-move-sg-big-buff-sysctl-to-scsi-sgc
+++ a/include/scsi/sg.h
@@ -29,10 +29,6 @@
* For utility and test programs see: http://sg.danny.cz/sg/sg3_utils.html
*/
-#ifdef __KERNEL__
-extern int sg_big_buff; /* for sysctl */
-#endif
-
typedef struct sg_iovec /* same structure as used by readv() Linux system */
{ /* call. It defines one scatter-gather element. */
--- a/kernel/sysctl.c~scsi-sg-move-sg-big-buff-sysctl-to-scsi-sgc
+++ a/kernel/sysctl.c
@@ -95,9 +95,6 @@
#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
#include <linux/lockdep.h>
#endif
-#ifdef CONFIG_CHR_DEV_SG
-#include <scsi/sg.h>
-#endif
#ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
#include <linux/stackleak.h>
#endif
@@ -2090,15 +2087,6 @@ static struct ctl_table kern_table[] = {
.proc_handler = proc_dostring,
},
#endif
-#ifdef CONFIG_CHR_DEV_SG
- {
- .procname = "sg-big-buff",
- .data = &sg_big_buff,
- .maxlen = sizeof (int),
- .mode = 0444,
- .proc_handler = proc_dointvec,
- },
-#endif
#ifdef CONFIG_BSD_PROCESS_ACCT
{
.procname = "acct",
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 25/69] stackleak: move stack_erasing sysctl to stackleak.c
2022-01-22 6:10 incoming Andrew Morton
` (23 preceding siblings ...)
2022-01-22 6:12 ` [patch 24/69] scsi/sg: move sg-big-buff sysctl to scsi/sg.c Andrew Morton
@ 2022-01-22 6:12 ` Andrew Morton
2022-01-22 6:12 ` [patch 26/69] sysctl: share unsigned long const values Andrew Morton
` (43 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:12 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: stackleak: move stack_erasing sysctl to stackleak.c
kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
So move the stack_erasing sysctl from kernel/sysctl.c to
kernel/stackleak.c and use register_sysctl() to register the sysctl
interface.
[mcgrof@kernel.org: commit log update]
Link: https://lkml.kernel.org/r/20211124231435.1445213-8-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Qing Wang <wangqing@vivo.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/stackleak.h | 5 -----
kernel/stackleak.c | 26 ++++++++++++++++++++++++--
kernel/sysctl.c | 14 --------------
3 files changed, 24 insertions(+), 21 deletions(-)
--- a/include/linux/stackleak.h~stackleak-move-stack_erasing-sysctl-to-stackleakc
+++ a/include/linux/stackleak.h
@@ -23,11 +23,6 @@ static inline void stackleak_task_init(s
# endif
}
-#ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
-int stack_erasing_sysctl(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos);
-#endif
-
#else /* !CONFIG_GCC_PLUGIN_STACKLEAK */
static inline void stackleak_task_init(struct task_struct *t) { }
#endif
--- a/kernel/stackleak.c~stackleak-move-stack_erasing-sysctl-to-stackleakc
+++ a/kernel/stackleak.c
@@ -16,11 +16,13 @@
#ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
#include <linux/jump_label.h>
#include <linux/sysctl.h>
+#include <linux/init.h>
static DEFINE_STATIC_KEY_FALSE(stack_erasing_bypass);
-int stack_erasing_sysctl(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
+#ifdef CONFIG_SYSCTL
+static int stack_erasing_sysctl(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
{
int ret = 0;
int state = !static_branch_unlikely(&stack_erasing_bypass);
@@ -42,6 +44,26 @@ int stack_erasing_sysctl(struct ctl_tabl
state ? "enabled" : "disabled");
return ret;
}
+static struct ctl_table stackleak_sysctls[] = {
+ {
+ .procname = "stack_erasing",
+ .data = NULL,
+ .maxlen = sizeof(int),
+ .mode = 0600,
+ .proc_handler = stack_erasing_sysctl,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+ {}
+};
+
+static int __init stackleak_sysctls_init(void)
+{
+ register_sysctl_init("kernel", stackleak_sysctls);
+ return 0;
+}
+late_initcall(stackleak_sysctls_init);
+#endif /* CONFIG_SYSCTL */
#define skip_erasing() static_branch_unlikely(&stack_erasing_bypass)
#else
--- a/kernel/sysctl.c~stackleak-move-stack_erasing-sysctl-to-stackleakc
+++ a/kernel/sysctl.c
@@ -95,9 +95,6 @@
#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
#include <linux/lockdep.h>
#endif
-#ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
-#include <linux/stackleak.h>
-#endif
#if defined(CONFIG_SYSCTL)
@@ -2443,17 +2440,6 @@ static struct ctl_table kern_table[] = {
.extra2 = SYSCTL_INT_MAX,
},
#endif
-#ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
- {
- .procname = "stack_erasing",
- .data = NULL,
- .maxlen = sizeof(int),
- .mode = 0600,
- .proc_handler = stack_erasing_sysctl,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
-#endif
{ }
};
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 26/69] sysctl: share unsigned long const values
2022-01-22 6:10 incoming Andrew Morton
` (24 preceding siblings ...)
2022-01-22 6:12 ` [patch 25/69] stackleak: move stack_erasing sysctl to stackleak.c Andrew Morton
@ 2022-01-22 6:12 ` Andrew Morton
2022-01-22 6:12 ` [patch 27/69] fs: move inode sysctls to its own file Andrew Morton
` (42 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:12 UTC (permalink / raw)
To: airlied, akpm, amir73il, andriy.shevchenko, arnd, bcrl, benh,
clemens, crope, dgilbert, ebiederm, gregkh, jack, jani.nikula,
jani.nikula, jejb, jlbec, john.ogness, joonas.lahtinen,
joseph.qi, julia.lawall, keescook, kernel, linux-mm, mark,
martin.petersen, mcgrof, mm-commits, nixiaoming, penguin-kernel,
peterz, phil, pjt, pmladek, rafael, rodrigo.vivi, rostedt,
senozhatsky, sre, steve, surenb, torvalds, tytso, viro, wangqing,
yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: sysctl: share unsigned long const values
Provide a way to share unsigned long values. This will allow others to
not have to re-invent these values.
Link: https://lkml.kernel.org/r/20211124231435.1445213-9-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: James E.J. Bottomley <jejb@linux.ibm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Qing Wang <wangqing@vivo.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/proc/proc_sysctl.c | 3 +++
include/linux/sysctl.h | 6 ++++++
kernel/sysctl.c | 9 +++------
3 files changed, 12 insertions(+), 6 deletions(-)
--- a/fs/proc/proc_sysctl.c~sysctl-share-unsigned-long-const-values
+++ a/fs/proc/proc_sysctl.c
@@ -29,6 +29,9 @@ static const struct inode_operations pro
const int sysctl_vals[] = { -1, 0, 1, 2, 4, 100, 200, 1000, 3000, INT_MAX };
EXPORT_SYMBOL(sysctl_vals);
+const unsigned long sysctl_long_vals[] = { 0, 1, LONG_MAX };
+EXPORT_SYMBOL_GPL(sysctl_long_vals);
+
/* Support for permanently empty directories */
struct ctl_table sysctl_mount_point[] = {
--- a/include/linux/sysctl.h~sysctl-share-unsigned-long-const-values
+++ a/include/linux/sysctl.h
@@ -51,6 +51,12 @@ struct ctl_dir;
extern const int sysctl_vals[];
+#define SYSCTL_LONG_ZERO ((void *)&sysctl_long_vals[0])
+#define SYSCTL_LONG_ONE ((void *)&sysctl_long_vals[1])
+#define SYSCTL_LONG_MAX ((void *)&sysctl_long_vals[2])
+
+extern const unsigned long sysctl_long_vals[];
+
typedef int proc_handler(struct ctl_table *ctl, int write, void *buffer,
size_t *lenp, loff_t *ppos);
--- a/kernel/sysctl.c~sysctl-share-unsigned-long-const-values
+++ a/kernel/sysctl.c
@@ -100,9 +100,6 @@
/* Constants used for minimum and maximum */
-static const unsigned long zero_ul;
-static const unsigned long one_ul = 1;
-static const unsigned long long_max = LONG_MAX;
#ifdef CONFIG_PRINTK
static const int ten_thousand = 10000;
#endif
@@ -2513,7 +2510,7 @@ static struct ctl_table vm_table[] = {
.maxlen = sizeof(dirty_background_bytes),
.mode = 0644,
.proc_handler = dirty_background_bytes_handler,
- .extra1 = (void *)&one_ul,
+ .extra1 = SYSCTL_LONG_ONE,
},
{
.procname = "dirty_ratio",
@@ -2931,8 +2928,8 @@ static struct ctl_table fs_table[] = {
.maxlen = sizeof(files_stat.max_files),
.mode = 0644,
.proc_handler = proc_doulongvec_minmax,
- .extra1 = (void *)&zero_ul,
- .extra2 = (void *)&long_max,
+ .extra1 = SYSCTL_LONG_ZERO,
+ .extra2 = SYSCTL_LONG_MAX,
},
{
.procname = "nr_open",
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 27/69] fs: move inode sysctls to its own file
2022-01-22 6:10 incoming Andrew Morton
` (25 preceding siblings ...)
2022-01-22 6:12 ` [patch 26/69] sysctl: share unsigned long const values Andrew Morton
@ 2022-01-22 6:12 ` Andrew Morton
2022-01-22 6:12 ` [patch 28/69] fs: move fs stat sysctls to file_table.c Andrew Morton
` (41 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:12 UTC (permalink / raw)
To: akpm, andriy.shevchenko, arnd, bfields, crope, ebiederm, jlayton,
keescook, kernel, linux-mm, mcgrof, mm-commits, nixiaoming,
steve, torvalds, viro, yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: fs: move inode sysctls to its own file
Patch series "sysctl: 4th set of kernel/sysctl cleanups".
This is slimming down the fs uses of kernel/sysctl.c to the point that the
next step is to just get rid of the fs base directory for it and move that
elsehwere, so that next patch series starts dealing with that to demo how
we can end up cleaning up a full base directory from kernel/sysctl.c, one
at a time.
This patch (of 9):
kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
So move the inode sysctls to its own file. Since we are no longer using
this outside of fs/ remove the extern declaration of its respective proc
helper.
We use early_initcall() as it is the earliest we can use.
[arnd@arndb.de: avoid unused-variable warning]
Link: https://lkml.kernel.org/r/20211203190123.874239-1-arnd@kernel.org
Link: https://lkml.kernel.org/r/20211129205548.605569-1-mcgrof@kernel.org
Link: https://lkml.kernel.org/r/20211129205548.605569-2-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Kees Cook <keescook@chromium.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/inode.c | 39 ++++++++++++++++++++++++++++++++-------
include/linux/fs.h | 3 ---
kernel/sysctl.c | 14 --------------
3 files changed, 32 insertions(+), 24 deletions(-)
--- a/fs/inode.c~fs-move-inode-sysctls-to-its-own-file
+++ a/fs/inode.c
@@ -67,11 +67,6 @@ const struct address_space_operations em
};
EXPORT_SYMBOL(empty_aops);
-/*
- * Statistics gathering..
- */
-struct inodes_stat_t inodes_stat;
-
static DEFINE_PER_CPU(unsigned long, nr_inodes);
static DEFINE_PER_CPU(unsigned long, nr_unused);
@@ -106,13 +101,43 @@ long get_nr_dirty_inodes(void)
* Handle nr_inode sysctl
*/
#ifdef CONFIG_SYSCTL
-int proc_nr_inodes(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
+/*
+ * Statistics gathering..
+ */
+static struct inodes_stat_t inodes_stat;
+
+static int proc_nr_inodes(struct ctl_table *table, int write, void *buffer,
+ size_t *lenp, loff_t *ppos)
{
inodes_stat.nr_inodes = get_nr_inodes();
inodes_stat.nr_unused = get_nr_inodes_unused();
return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
}
+
+static struct ctl_table inodes_sysctls[] = {
+ {
+ .procname = "inode-nr",
+ .data = &inodes_stat,
+ .maxlen = 2*sizeof(long),
+ .mode = 0444,
+ .proc_handler = proc_nr_inodes,
+ },
+ {
+ .procname = "inode-state",
+ .data = &inodes_stat,
+ .maxlen = 7*sizeof(long),
+ .mode = 0444,
+ .proc_handler = proc_nr_inodes,
+ },
+ { }
+};
+
+static int __init init_fs_inode_sysctls(void)
+{
+ register_sysctl_init("fs", inodes_sysctls);
+ return 0;
+}
+early_initcall(init_fs_inode_sysctls);
#endif
static int no_open(struct inode *inode, struct file *file)
--- a/include/linux/fs.h~fs-move-inode-sysctls-to-its-own-file
+++ a/include/linux/fs.h
@@ -82,7 +82,6 @@ extern void __init files_maxfiles_init(v
extern struct files_stat_struct files_stat;
extern unsigned long get_max_files(void);
extern unsigned int sysctl_nr_open;
-extern struct inodes_stat_t inodes_stat;
extern int leases_enable, lease_break_time;
extern int sysctl_protected_symlinks;
extern int sysctl_protected_hardlinks;
@@ -3537,8 +3536,6 @@ int proc_nr_files(struct ctl_table *tabl
void *buffer, size_t *lenp, loff_t *ppos);
int proc_nr_dentry(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
-int proc_nr_inodes(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos);
int __init list_bdev_fs_names(char *buf, size_t size);
#define __FMODE_EXEC ((__force int) FMODE_EXEC)
--- a/kernel/sysctl.c~fs-move-inode-sysctls-to-its-own-file
+++ a/kernel/sysctl.c
@@ -2902,20 +2902,6 @@ static struct ctl_table vm_table[] = {
static struct ctl_table fs_table[] = {
{
- .procname = "inode-nr",
- .data = &inodes_stat,
- .maxlen = 2*sizeof(long),
- .mode = 0444,
- .proc_handler = proc_nr_inodes,
- },
- {
- .procname = "inode-state",
- .data = &inodes_stat,
- .maxlen = 7*sizeof(long),
- .mode = 0444,
- .proc_handler = proc_nr_inodes,
- },
- {
.procname = "file-nr",
.data = &files_stat,
.maxlen = sizeof(files_stat),
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 28/69] fs: move fs stat sysctls to file_table.c
2022-01-22 6:10 incoming Andrew Morton
` (26 preceding siblings ...)
2022-01-22 6:12 ` [patch 27/69] fs: move inode sysctls to its own file Andrew Morton
@ 2022-01-22 6:12 ` Andrew Morton
2022-01-22 6:12 ` [patch 29/69] fs: move dcache sysctls to its own file Andrew Morton
` (40 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:12 UTC (permalink / raw)
To: akpm, andriy.shevchenko, bfields, crope, ebiederm, jlayton,
keescook, kernel, linux-mm, mcgrof, mm-commits, nixiaoming,
steve, torvalds, viro, yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: fs: move fs stat sysctls to file_table.c
kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
We can create the sysctl dynamically on early init for fs stat to help
with this clutter. This dusts off the fs stat syctls knobs and puts them
into where they are declared.
Link: https://lkml.kernel.org/r/20211129205548.605569-3-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/file_table.c | 47 +++++++++++++++++++++++++++++++++++--------
include/linux/fs.h | 3 --
kernel/sysctl.c | 25 ----------------------
3 files changed, 39 insertions(+), 36 deletions(-)
--- a/fs/file_table.c~fs-move-fs-stat-sysctls-to-file_tablec
+++ a/fs/file_table.c
@@ -33,7 +33,7 @@
#include "internal.h"
/* sysctl tunables... */
-struct files_stat_struct files_stat = {
+static struct files_stat_struct files_stat = {
.max_files = NR_FILE
};
@@ -75,22 +75,53 @@ unsigned long get_max_files(void)
}
EXPORT_SYMBOL_GPL(get_max_files);
+#if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
+
/*
* Handle nr_files sysctl
*/
-#if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
-int proc_nr_files(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
+static int proc_nr_files(struct ctl_table *table, int write, void *buffer,
+ size_t *lenp, loff_t *ppos)
{
files_stat.nr_files = get_nr_files();
return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
}
-#else
-int proc_nr_files(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
+
+static struct ctl_table fs_stat_sysctls[] = {
+ {
+ .procname = "file-nr",
+ .data = &files_stat,
+ .maxlen = sizeof(files_stat),
+ .mode = 0444,
+ .proc_handler = proc_nr_files,
+ },
+ {
+ .procname = "file-max",
+ .data = &files_stat.max_files,
+ .maxlen = sizeof(files_stat.max_files),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ .extra1 = SYSCTL_LONG_ZERO,
+ .extra2 = SYSCTL_LONG_MAX,
+ },
+ {
+ .procname = "nr_open",
+ .data = &sysctl_nr_open,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &sysctl_nr_open_min,
+ .extra2 = &sysctl_nr_open_max,
+ },
+ { }
+};
+
+static int __init init_fs_stat_sysctls(void)
{
- return -ENOSYS;
+ register_sysctl_init("fs", fs_stat_sysctls);
+ return 0;
}
+fs_initcall(init_fs_stat_sysctls);
#endif
static struct file *__alloc_file(int flags, const struct cred *cred)
--- a/include/linux/fs.h~fs-move-fs-stat-sysctls-to-file_tablec
+++ a/include/linux/fs.h
@@ -79,7 +79,6 @@ extern void __init inode_init_early(void
extern void __init files_init(void);
extern void __init files_maxfiles_init(void);
-extern struct files_stat_struct files_stat;
extern unsigned long get_max_files(void);
extern unsigned int sysctl_nr_open;
extern int leases_enable, lease_break_time;
@@ -3532,8 +3531,6 @@ ssize_t simple_attr_write(struct file *f
size_t len, loff_t *ppos);
struct ctl_table;
-int proc_nr_files(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos);
int proc_nr_dentry(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
int __init list_bdev_fs_names(char *buf, size_t size);
--- a/kernel/sysctl.c~fs-move-fs-stat-sysctls-to-file_tablec
+++ a/kernel/sysctl.c
@@ -2902,31 +2902,6 @@ static struct ctl_table vm_table[] = {
static struct ctl_table fs_table[] = {
{
- .procname = "file-nr",
- .data = &files_stat,
- .maxlen = sizeof(files_stat),
- .mode = 0444,
- .proc_handler = proc_nr_files,
- },
- {
- .procname = "file-max",
- .data = &files_stat.max_files,
- .maxlen = sizeof(files_stat.max_files),
- .mode = 0644,
- .proc_handler = proc_doulongvec_minmax,
- .extra1 = SYSCTL_LONG_ZERO,
- .extra2 = SYSCTL_LONG_MAX,
- },
- {
- .procname = "nr_open",
- .data = &sysctl_nr_open,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = &sysctl_nr_open_min,
- .extra2 = &sysctl_nr_open_max,
- },
- {
.procname = "dentry-state",
.data = &dentry_stat,
.maxlen = 6*sizeof(long),
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 29/69] fs: move dcache sysctls to its own file
2022-01-22 6:10 incoming Andrew Morton
` (27 preceding siblings ...)
2022-01-22 6:12 ` [patch 28/69] fs: move fs stat sysctls to file_table.c Andrew Morton
@ 2022-01-22 6:12 ` Andrew Morton
2022-01-22 6:13 ` [patch 30/69] sysctl: move maxolduid as a sysctl specific const Andrew Morton
` (39 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:12 UTC (permalink / raw)
To: akpm, andriy.shevchenko, arnd, bfields, crope, ebiederm, jlayton,
keescook, kernel, linux-mm, mcgrof, mm-commits, nixiaoming,
steve, torvalds, viro, yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: fs: move dcache sysctls to its own file
kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
So move the dcache sysctl clutter out of kernel/sysctl.c. This is a small
one-off entry, perhaps later we can simplify this representation, but for
now we use the helpers we have. We won't know how we can simplify this
further untl we're fully done with the cleanup.
[arnd@arndb.de: avoid unused-function warning]
Link: https://lkml.kernel.org/r/20211203190123.874239-2-arnd@kernel.org
Link: https://lkml.kernel.org/r/20211129205548.605569-4-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/dcache.c | 37 +++++++++++++++++++++++++++++++------
include/linux/dcache.h | 10 ----------
include/linux/fs.h | 2 --
kernel/sysctl.c | 7 -------
4 files changed, 31 insertions(+), 25 deletions(-)
--- a/fs/dcache.c~fs-move-dcache-sysctls-to-its-own-file
+++ a/fs/dcache.c
@@ -115,10 +115,13 @@ static inline struct hlist_bl_head *in_l
return in_lookup_hashtable + hash_32(hash, IN_LOOKUP_SHIFT);
}
-
-/* Statistics gathering. */
-struct dentry_stat_t dentry_stat = {
- .age_limit = 45,
+struct dentry_stat_t {
+ long nr_dentry;
+ long nr_unused;
+ long age_limit; /* age in seconds */
+ long want_pages; /* pages requested by system */
+ long nr_negative; /* # of unused negative dentries */
+ long dummy; /* Reserved for future use */
};
static DEFINE_PER_CPU(long, nr_dentry);
@@ -126,6 +129,10 @@ static DEFINE_PER_CPU(long, nr_dentry_un
static DEFINE_PER_CPU(long, nr_dentry_negative);
#if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
+/* Statistics gathering. */
+static struct dentry_stat_t dentry_stat = {
+ .age_limit = 45,
+};
/*
* Here we resort to our own counters instead of using generic per-cpu counters
@@ -167,14 +174,32 @@ static long get_nr_dentry_negative(void)
return sum < 0 ? 0 : sum;
}
-int proc_nr_dentry(struct ctl_table *table, int write, void *buffer,
- size_t *lenp, loff_t *ppos)
+static int proc_nr_dentry(struct ctl_table *table, int write, void *buffer,
+ size_t *lenp, loff_t *ppos)
{
dentry_stat.nr_dentry = get_nr_dentry();
dentry_stat.nr_unused = get_nr_dentry_unused();
dentry_stat.nr_negative = get_nr_dentry_negative();
return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
}
+
+static struct ctl_table fs_dcache_sysctls[] = {
+ {
+ .procname = "dentry-state",
+ .data = &dentry_stat,
+ .maxlen = 6*sizeof(long),
+ .mode = 0444,
+ .proc_handler = proc_nr_dentry,
+ },
+ { }
+};
+
+static int __init init_fs_dcache_sysctls(void)
+{
+ register_sysctl_init("fs", fs_dcache_sysctls);
+ return 0;
+}
+fs_initcall(init_fs_dcache_sysctls);
#endif
/*
--- a/include/linux/dcache.h~fs-move-dcache-sysctls-to-its-own-file
+++ a/include/linux/dcache.h
@@ -61,16 +61,6 @@ extern const struct qstr empty_name;
extern const struct qstr slash_name;
extern const struct qstr dotdot_name;
-struct dentry_stat_t {
- long nr_dentry;
- long nr_unused;
- long age_limit; /* age in seconds */
- long want_pages; /* pages requested by system */
- long nr_negative; /* # of unused negative dentries */
- long dummy; /* Reserved for future use */
-};
-extern struct dentry_stat_t dentry_stat;
-
/*
* Try to keep struct dentry aligned on 64 byte cachelines (this will
* give reasonable cacheline footprint with larger lines without the
--- a/include/linux/fs.h~fs-move-dcache-sysctls-to-its-own-file
+++ a/include/linux/fs.h
@@ -3531,8 +3531,6 @@ ssize_t simple_attr_write(struct file *f
size_t len, loff_t *ppos);
struct ctl_table;
-int proc_nr_dentry(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos);
int __init list_bdev_fs_names(char *buf, size_t size);
#define __FMODE_EXEC ((__force int) FMODE_EXEC)
--- a/kernel/sysctl.c~fs-move-dcache-sysctls-to-its-own-file
+++ a/kernel/sysctl.c
@@ -2902,13 +2902,6 @@ static struct ctl_table vm_table[] = {
static struct ctl_table fs_table[] = {
{
- .procname = "dentry-state",
- .data = &dentry_stat,
- .maxlen = 6*sizeof(long),
- .mode = 0444,
- .proc_handler = proc_nr_dentry,
- },
- {
.procname = "overflowuid",
.data = &fs_overflowuid,
.maxlen = sizeof(int),
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 30/69] sysctl: move maxolduid as a sysctl specific const
2022-01-22 6:10 incoming Andrew Morton
` (28 preceding siblings ...)
2022-01-22 6:12 ` [patch 29/69] fs: move dcache sysctls to its own file Andrew Morton
@ 2022-01-22 6:13 ` Andrew Morton
2022-01-22 6:13 ` [patch 31/69] fs: move shared sysctls to fs/sysctls.c Andrew Morton
` (38 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:13 UTC (permalink / raw)
To: akpm, andriy.shevchenko, bfields, crope, ebiederm, jlayton,
keescook, kernel, linux-mm, mcgrof, mic, mm-commits, nixiaoming,
steve, torvalds, viro, yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: sysctl: move maxolduid as a sysctl specific const
The maxolduid value is only shared for sysctl purposes for use on a max
range. Just stuff this into our shared const array.
[akpm@linux-foundation.org: fix sysctl_vals[], per Mickaël]
Link: https://lkml.kernel.org/r/20211129205548.605569-5-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/proc/proc_sysctl.c | 2 +-
include/linux/sysctl.h | 3 +++
kernel/sysctl.c | 12 ++++--------
3 files changed, 8 insertions(+), 9 deletions(-)
--- a/fs/proc/proc_sysctl.c~sysctl-move-maxolduid-as-a-sysctl-specific-const
+++ a/fs/proc/proc_sysctl.c
@@ -26,7 +26,7 @@ static const struct file_operations proc
static const struct inode_operations proc_sys_dir_operations;
/* shared constants to be used in various sysctls */
-const int sysctl_vals[] = { -1, 0, 1, 2, 4, 100, 200, 1000, 3000, INT_MAX };
+const int sysctl_vals[] = { -1, 0, 1, 2, 4, 100, 200, 1000, 3000, INT_MAX, 65535 };
EXPORT_SYMBOL(sysctl_vals);
const unsigned long sysctl_long_vals[] = { 0, 1, LONG_MAX };
--- a/include/linux/sysctl.h~sysctl-move-maxolduid-as-a-sysctl-specific-const
+++ a/include/linux/sysctl.h
@@ -49,6 +49,9 @@ struct ctl_dir;
#define SYSCTL_THREE_THOUSAND ((void *)&sysctl_vals[8])
#define SYSCTL_INT_MAX ((void *)&sysctl_vals[9])
+/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
+#define SYSCTL_MAXOLDUID ((void *)&sysctl_vals[10])
+
extern const int sysctl_vals[];
#define SYSCTL_LONG_ZERO ((void *)&sysctl_long_vals[0])
--- a/kernel/sysctl.c~sysctl-move-maxolduid-as-a-sysctl-specific-const
+++ a/kernel/sysctl.c
@@ -110,10 +110,6 @@ static const int six_hundred_forty_kb =
/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
static const unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
-/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
-static const int maxolduid = 65535;
-/* minolduid is SYSCTL_ZERO */
-
static const int ngroups_max = NGROUPS_MAX;
static const int cap_last_cap = CAP_LAST_CAP;
@@ -2127,7 +2123,7 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
- .extra2 = (void *)&maxolduid,
+ .extra2 = SYSCTL_MAXOLDUID,
},
{
.procname = "overflowgid",
@@ -2136,7 +2132,7 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
- .extra2 = (void *)&maxolduid,
+ .extra2 = SYSCTL_MAXOLDUID,
},
#ifdef CONFIG_S390
{
@@ -2908,7 +2904,7 @@ static struct ctl_table fs_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
- .extra2 = (void *)&maxolduid,
+ .extra2 = SYSCTL_MAXOLDUID,
},
{
.procname = "overflowgid",
@@ -2917,7 +2913,7 @@ static struct ctl_table fs_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
- .extra2 = (void *)&maxolduid,
+ .extra2 = SYSCTL_MAXOLDUID,
},
#ifdef CONFIG_FILE_LOCKING
{
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 31/69] fs: move shared sysctls to fs/sysctls.c
2022-01-22 6:10 incoming Andrew Morton
` (29 preceding siblings ...)
2022-01-22 6:13 ` [patch 30/69] sysctl: move maxolduid as a sysctl specific const Andrew Morton
@ 2022-01-22 6:13 ` Andrew Morton
2022-01-22 6:13 ` [patch 32/69] fs: move locking sysctls where they are used Andrew Morton
` (37 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:13 UTC (permalink / raw)
To: akpm, andriy.shevchenko, bfields, crope, ebiederm, jlayton,
keescook, kernel, linux-mm, mcgrof, mm-commits, nixiaoming,
steve, torvalds, viro, yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: fs: move shared sysctls to fs/sysctls.c
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
So move sysctls which are shared between filesystems into a common file
outside of kernel/sysctl.c.
Link: https://lkml.kernel.org/r/20211129205548.605569-6-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/Makefile | 1 +
fs/sysctls.c | 38 ++++++++++++++++++++++++++++++++++++++
kernel/sysctl.c | 18 ------------------
3 files changed, 39 insertions(+), 18 deletions(-)
--- a/fs/Makefile~fs-move-shared-sysctls-to-fs-sysctlsc
+++ a/fs/Makefile
@@ -28,6 +28,7 @@ obj-y += notify/
obj-$(CONFIG_EPOLL) += eventpoll.o
obj-y += anon_inodes.o
obj-$(CONFIG_SIGNALFD) += signalfd.o
+obj-$(CONFIG_SYSCTL) += sysctls.o
obj-$(CONFIG_TIMERFD) += timerfd.o
obj-$(CONFIG_EVENTFD) += eventfd.o
obj-$(CONFIG_USERFAULTFD) += userfaultfd.o
--- /dev/null
+++ a/fs/sysctls.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * /proc/sys/fs shared sysctls
+ *
+ * These sysctls are shared between different filesystems.
+ */
+#include <linux/init.h>
+#include <linux/sysctl.h>
+
+static struct ctl_table fs_shared_sysctls[] = {
+ {
+ .procname = "overflowuid",
+ .data = &fs_overflowuid,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_MAXOLDUID,
+ },
+ {
+ .procname = "overflowgid",
+ .data = &fs_overflowgid,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_MAXOLDUID,
+ },
+ { }
+};
+
+static int __init init_fs_shared_sysctls(void)
+{
+ register_sysctl_init("fs", fs_shared_sysctls);
+ return 0;
+}
+
+early_initcall(init_fs_shared_sysctls);
--- a/kernel/sysctl.c~fs-move-shared-sysctls-to-fs-sysctlsc
+++ a/kernel/sysctl.c
@@ -2897,24 +2897,6 @@ static struct ctl_table vm_table[] = {
};
static struct ctl_table fs_table[] = {
- {
- .procname = "overflowuid",
- .data = &fs_overflowuid,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_MAXOLDUID,
- },
- {
- .procname = "overflowgid",
- .data = &fs_overflowgid,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_MAXOLDUID,
- },
#ifdef CONFIG_FILE_LOCKING
{
.procname = "leases-enable",
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 32/69] fs: move locking sysctls where they are used
2022-01-22 6:10 incoming Andrew Morton
` (30 preceding siblings ...)
2022-01-22 6:13 ` [patch 31/69] fs: move shared sysctls to fs/sysctls.c Andrew Morton
@ 2022-01-22 6:13 ` Andrew Morton
2022-01-22 6:13 ` [patch 33/69] fs: move namei sysctls to its own file Andrew Morton
` (36 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:13 UTC (permalink / raw)
To: akpm, andriy.shevchenko, bfields, crope, ebiederm, jlayton,
keescook, kernel, linux-mm, mcgrof, mm-commits, nixiaoming,
steve, torvalds, viro, yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: fs: move locking sysctls where they are used
kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
The locking fs sysctls are only used on fs/locks.c, so move them there.
Link: https://lkml.kernel.org/r/20211129205548.605569-7-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/locks.c | 34 ++++++++++++++++++++++++++++++++--
include/linux/fs.h | 4 ----
kernel/sysctl.c | 20 --------------------
3 files changed, 32 insertions(+), 26 deletions(-)
--- a/fs/locks.c~fs-move-locking-sysctls-where-they-are-used
+++ a/fs/locks.c
@@ -62,6 +62,7 @@
#include <linux/pid_namespace.h>
#include <linux/hashtable.h>
#include <linux/percpu.h>
+#include <linux/sysctl.h>
#define CREATE_TRACE_POINTS
#include <trace/events/filelock.h>
@@ -88,8 +89,37 @@ static int target_leasetype(struct file_
return fl->fl_type;
}
-int leases_enable = 1;
-int lease_break_time = 45;
+static int leases_enable = 1;
+static int lease_break_time = 45;
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table locks_sysctls[] = {
+ {
+ .procname = "leases-enable",
+ .data = &leases_enable,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#ifdef CONFIG_MMU
+ {
+ .procname = "lease-break-time",
+ .data = &lease_break_time,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif /* CONFIG_MMU */
+ {}
+};
+
+static int __init init_fs_locks_sysctls(void)
+{
+ register_sysctl_init("fs", locks_sysctls);
+ return 0;
+}
+early_initcall(init_fs_locks_sysctls);
+#endif /* CONFIG_SYSCTL */
/*
* The global file_lock_list is only used for displaying /proc/locks, so we
--- a/include/linux/fs.h~fs-move-locking-sysctls-where-they-are-used
+++ a/include/linux/fs.h
@@ -82,10 +82,6 @@ extern void __init files_maxfiles_init(v
extern unsigned long get_max_files(void);
extern unsigned int sysctl_nr_open;
extern int leases_enable, lease_break_time;
-extern int sysctl_protected_symlinks;
-extern int sysctl_protected_hardlinks;
-extern int sysctl_protected_fifos;
-extern int sysctl_protected_regular;
typedef __kernel_rwf_t rwf_t;
--- a/kernel/sysctl.c~fs-move-locking-sysctls-where-they-are-used
+++ a/kernel/sysctl.c
@@ -2897,26 +2897,6 @@ static struct ctl_table vm_table[] = {
};
static struct ctl_table fs_table[] = {
-#ifdef CONFIG_FILE_LOCKING
- {
- .procname = "leases-enable",
- .data = &leases_enable,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
-#endif
-#ifdef CONFIG_MMU
-#ifdef CONFIG_FILE_LOCKING
- {
- .procname = "lease-break-time",
- .data = &lease_break_time,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
-#endif
-#endif
{
.procname = "protected_symlinks",
.data = &sysctl_protected_symlinks,
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 33/69] fs: move namei sysctls to its own file
2022-01-22 6:10 incoming Andrew Morton
` (31 preceding siblings ...)
2022-01-22 6:13 ` [patch 32/69] fs: move locking sysctls where they are used Andrew Morton
@ 2022-01-22 6:13 ` Andrew Morton
2022-01-22 6:13 ` [patch 34/69] fs: move fs/exec.c sysctls into " Andrew Morton
` (35 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:13 UTC (permalink / raw)
To: akpm, andriy.shevchenko, bfields, crope, ebiederm, jlayton,
keescook, kernel, linux-mm, mcgrof, mm-commits, nixiaoming,
steve, torvalds, viro, yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: fs: move namei sysctls to its own file
kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
So move namei's own sysctl knobs to its own file.
Other than the move we also avoid initializing two static variables to 0
as this is not needed:
* sysctl_protected_symlinks
* sysctl_protected_hardlinks
Link: https://lkml.kernel.org/r/20211129205548.605569-8-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/namei.c | 58 ++++++++++++++++++++++++++++++++++++++++---
include/linux/fs.h | 1
kernel/sysctl.c | 36 --------------------------
3 files changed, 54 insertions(+), 41 deletions(-)
--- a/fs/namei.c~fs-move-namei-sysctls-to-its-own-file
+++ a/fs/namei.c
@@ -1020,10 +1020,60 @@ static inline void put_link(struct namei
path_put(&last->link);
}
-int sysctl_protected_symlinks __read_mostly = 0;
-int sysctl_protected_hardlinks __read_mostly = 0;
-int sysctl_protected_fifos __read_mostly;
-int sysctl_protected_regular __read_mostly;
+static int sysctl_protected_symlinks __read_mostly;
+static int sysctl_protected_hardlinks __read_mostly;
+static int sysctl_protected_fifos __read_mostly;
+static int sysctl_protected_regular __read_mostly;
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table namei_sysctls[] = {
+ {
+ .procname = "protected_symlinks",
+ .data = &sysctl_protected_symlinks,
+ .maxlen = sizeof(int),
+ .mode = 0600,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+ {
+ .procname = "protected_hardlinks",
+ .data = &sysctl_protected_hardlinks,
+ .maxlen = sizeof(int),
+ .mode = 0600,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+ {
+ .procname = "protected_fifos",
+ .data = &sysctl_protected_fifos,
+ .maxlen = sizeof(int),
+ .mode = 0600,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_TWO,
+ },
+ {
+ .procname = "protected_regular",
+ .data = &sysctl_protected_regular,
+ .maxlen = sizeof(int),
+ .mode = 0600,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_TWO,
+ },
+ { }
+};
+
+static int __init init_fs_namei_sysctls(void)
+{
+ register_sysctl_init("fs", namei_sysctls);
+ return 0;
+}
+fs_initcall(init_fs_namei_sysctls);
+
+#endif /* CONFIG_SYSCTL */
/**
* may_follow_link - Check symlink following for unsafe situations
--- a/include/linux/fs.h~fs-move-namei-sysctls-to-its-own-file
+++ a/include/linux/fs.h
@@ -81,7 +81,6 @@ extern void __init files_maxfiles_init(v
extern unsigned long get_max_files(void);
extern unsigned int sysctl_nr_open;
-extern int leases_enable, lease_break_time;
typedef __kernel_rwf_t rwf_t;
--- a/kernel/sysctl.c~fs-move-namei-sysctls-to-its-own-file
+++ a/kernel/sysctl.c
@@ -2898,42 +2898,6 @@ static struct ctl_table vm_table[] = {
static struct ctl_table fs_table[] = {
{
- .procname = "protected_symlinks",
- .data = &sysctl_protected_symlinks,
- .maxlen = sizeof(int),
- .mode = 0600,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- {
- .procname = "protected_hardlinks",
- .data = &sysctl_protected_hardlinks,
- .maxlen = sizeof(int),
- .mode = 0600,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- {
- .procname = "protected_fifos",
- .data = &sysctl_protected_fifos,
- .maxlen = sizeof(int),
- .mode = 0600,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_TWO,
- },
- {
- .procname = "protected_regular",
- .data = &sysctl_protected_regular,
- .maxlen = sizeof(int),
- .mode = 0600,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_TWO,
- },
- {
.procname = "suid_dumpable",
.data = &suid_dumpable,
.maxlen = sizeof(int),
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 34/69] fs: move fs/exec.c sysctls into its own file
2022-01-22 6:10 incoming Andrew Morton
` (32 preceding siblings ...)
2022-01-22 6:13 ` [patch 33/69] fs: move namei sysctls to its own file Andrew Morton
@ 2022-01-22 6:13 ` Andrew Morton
2022-01-22 6:13 ` [patch 35/69] fs: move pipe sysctls to is " Andrew Morton
` (34 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:13 UTC (permalink / raw)
To: akpm, andriy.shevchenko, bfields, crope, ebiederm, jlayton,
keescook, kernel, linux-mm, mcgrof, mm-commits, nixiaoming,
steve, torvalds, viro, yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: fs: move fs/exec.c sysctls into its own file
kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
So move the fs/exec.c respective sysctls to its own file.
Since checkpatch complains about style issues with the old code, this move
also fixes a few of those minor style issues:
* Use pr_warn() instead of prink(WARNING
* New empty lines are wanted at the beginning of routines
Link: https://lkml.kernel.org/r/20211129205548.605569-9-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/exec.c | 90 ++++++++++++++++++++++++++++++++++++++++++++++
kernel/sysctl.c | 66 ---------------------------------
2 files changed, 90 insertions(+), 66 deletions(-)
--- a/fs/exec.c~fs-move-fs-execc-sysctls-into-its-own-file
+++ a/fs/exec.c
@@ -65,6 +65,7 @@
#include <linux/vmalloc.h>
#include <linux/io_uring.h>
#include <linux/syscall_user_dispatch.h>
+#include <linux/coredump.h>
#include <linux/uaccess.h>
#include <asm/mmu_context.h>
@@ -2099,3 +2100,92 @@ COMPAT_SYSCALL_DEFINE5(execveat, int, fd
argv, envp, flags);
}
#endif
+
+#ifdef CONFIG_SYSCTL
+
+static void validate_coredump_safety(void)
+{
+#ifdef CONFIG_COREDUMP
+ if (suid_dumpable == SUID_DUMP_ROOT &&
+ core_pattern[0] != '/' && core_pattern[0] != '|') {
+ pr_warn(
+"Unsafe core_pattern used with fs.suid_dumpable=2.\n"
+"Pipe handler or fully qualified core dump path required.\n"
+"Set kernel.core_pattern before fs.suid_dumpable.\n"
+ );
+ }
+#endif
+}
+
+static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+
+ if (!error)
+ validate_coredump_safety();
+ return error;
+}
+
+static struct ctl_table fs_exec_sysctls[] = {
+ {
+ .procname = "suid_dumpable",
+ .data = &suid_dumpable,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax_coredump,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_TWO,
+ },
+ { }
+};
+
+#ifdef CONFIG_COREDUMP
+
+static int proc_dostring_coredump(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ int error = proc_dostring(table, write, buffer, lenp, ppos);
+
+ if (!error)
+ validate_coredump_safety();
+ return error;
+}
+
+static struct ctl_table kernel_exec_sysctls[] = {
+ {
+ .procname = "core_uses_pid",
+ .data = &core_uses_pid,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "core_pattern",
+ .data = core_pattern,
+ .maxlen = CORENAME_MAX_SIZE,
+ .mode = 0644,
+ .proc_handler = proc_dostring_coredump,
+ },
+ {
+ .procname = "core_pipe_limit",
+ .data = &core_pipe_limit,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ { }
+};
+#endif
+
+static int __init init_fs_exec_sysctls(void)
+{
+ register_sysctl_init("fs", fs_exec_sysctls);
+#ifdef CONFIG_COREDUMP
+ register_sysctl_init("kernel", kernel_exec_sysctls);
+#endif
+ return 0;
+}
+
+fs_initcall(init_fs_exec_sysctls);
+#endif /* CONFIG_SYSCTL */
--- a/kernel/sysctl.c~fs-move-fs-execc-sysctls-into-its-own-file
+++ a/kernel/sysctl.c
@@ -1117,40 +1117,6 @@ static int proc_dopipe_max_size(struct c
do_proc_dopipe_max_size_conv, NULL);
}
-static void validate_coredump_safety(void)
-{
-#ifdef CONFIG_COREDUMP
- if (suid_dumpable == SUID_DUMP_ROOT &&
- core_pattern[0] != '/' && core_pattern[0] != '|') {
- printk(KERN_WARNING
-"Unsafe core_pattern used with fs.suid_dumpable=2.\n"
-"Pipe handler or fully qualified core dump path required.\n"
-"Set kernel.core_pattern before fs.suid_dumpable.\n"
- );
- }
-#endif
-}
-
-static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
-{
- int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
- if (!error)
- validate_coredump_safety();
- return error;
-}
-
-#ifdef CONFIG_COREDUMP
-static int proc_dostring_coredump(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
-{
- int error = proc_dostring(table, write, buffer, lenp, ppos);
- if (!error)
- validate_coredump_safety();
- return error;
-}
-#endif
-
#ifdef CONFIG_MAGIC_SYSRQ
static int sysrq_sysctl_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
@@ -1874,29 +1840,6 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec,
},
-#ifdef CONFIG_COREDUMP
- {
- .procname = "core_uses_pid",
- .data = &core_uses_pid,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "core_pattern",
- .data = core_pattern,
- .maxlen = CORENAME_MAX_SIZE,
- .mode = 0644,
- .proc_handler = proc_dostring_coredump,
- },
- {
- .procname = "core_pipe_limit",
- .data = &core_pipe_limit,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
-#endif
#ifdef CONFIG_PROC_SYSCTL
{
.procname = "tainted",
@@ -2898,15 +2841,6 @@ static struct ctl_table vm_table[] = {
static struct ctl_table fs_table[] = {
{
- .procname = "suid_dumpable",
- .data = &suid_dumpable,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax_coredump,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_TWO,
- },
- {
.procname = "pipe-max-size",
.data = &pipe_max_size,
.maxlen = sizeof(pipe_max_size),
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 35/69] fs: move pipe sysctls to is own file
2022-01-22 6:10 incoming Andrew Morton
` (33 preceding siblings ...)
2022-01-22 6:13 ` [patch 34/69] fs: move fs/exec.c sysctls into " Andrew Morton
@ 2022-01-22 6:13 ` Andrew Morton
2022-01-22 6:13 ` [patch 36/69] sysctl: add and use base directory declarer and registration helper Andrew Morton
` (33 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:13 UTC (permalink / raw)
To: akpm, andriy.shevchenko, bfields, crope, ebiederm, jlayton,
keescook, kernel, linux-mm, mcgrof, mm-commits, nixiaoming,
steve, torvalds, viro, yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: fs: move pipe sysctls to is own file
kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
So move the pipe sysctls to its own file.
Link: https://lkml.kernel.org/r/20211129205548.605569-10-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/pipe.c | 64 ++++++++++++++++++++++++++++++++++--
include/linux/pipe_fs_i.h | 4 --
include/linux/sysctl.h | 6 +++
kernel/sysctl.c | 61 +++-------------------------------
4 files changed, 73 insertions(+), 62 deletions(-)
--- a/fs/pipe.c~fs-move-pipe-sysctls-to-is-own-file
+++ a/fs/pipe.c
@@ -25,6 +25,7 @@
#include <linux/fcntl.h>
#include <linux/memcontrol.h>
#include <linux/watch_queue.h>
+#include <linux/sysctl.h>
#include <linux/uaccess.h>
#include <asm/ioctls.h>
@@ -50,13 +51,13 @@
* The max size that a non-root user is allowed to grow the pipe. Can
* be set by root in /proc/sys/fs/pipe-max-size
*/
-unsigned int pipe_max_size = 1048576;
+static unsigned int pipe_max_size = 1048576;
/* Maximum allocatable pages per user. Hard limit is unset by default, soft
* matches default values.
*/
-unsigned long pipe_user_pages_hard;
-unsigned long pipe_user_pages_soft = PIPE_DEF_BUFFERS * INR_OPEN_CUR;
+static unsigned long pipe_user_pages_hard;
+static unsigned long pipe_user_pages_soft = PIPE_DEF_BUFFERS * INR_OPEN_CUR;
/*
* We use head and tail indices that aren't masked off, except at the point of
@@ -1428,6 +1429,60 @@ static struct file_system_type pipe_fs_t
.kill_sb = kill_anon_super,
};
+#ifdef CONFIG_SYSCTL
+static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
+ unsigned int *valp,
+ int write, void *data)
+{
+ if (write) {
+ unsigned int val;
+
+ val = round_pipe_size(*lvalp);
+ if (val == 0)
+ return -EINVAL;
+
+ *valp = val;
+ } else {
+ unsigned int val = *valp;
+ *lvalp = (unsigned long) val;
+ }
+
+ return 0;
+}
+
+static int proc_dopipe_max_size(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ return do_proc_douintvec(table, write, buffer, lenp, ppos,
+ do_proc_dopipe_max_size_conv, NULL);
+}
+
+static struct ctl_table fs_pipe_sysctls[] = {
+ {
+ .procname = "pipe-max-size",
+ .data = &pipe_max_size,
+ .maxlen = sizeof(pipe_max_size),
+ .mode = 0644,
+ .proc_handler = proc_dopipe_max_size,
+ },
+ {
+ .procname = "pipe-user-pages-hard",
+ .data = &pipe_user_pages_hard,
+ .maxlen = sizeof(pipe_user_pages_hard),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ },
+ {
+ .procname = "pipe-user-pages-soft",
+ .data = &pipe_user_pages_soft,
+ .maxlen = sizeof(pipe_user_pages_soft),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ },
+ { }
+};
+#endif
+
static int __init init_pipe_fs(void)
{
int err = register_filesystem(&pipe_fs_type);
@@ -1439,6 +1494,9 @@ static int __init init_pipe_fs(void)
unregister_filesystem(&pipe_fs_type);
}
}
+#ifdef CONFIG_SYSCTL
+ register_sysctl_init("fs", fs_pipe_sysctls);
+#endif
return err;
}
--- a/include/linux/pipe_fs_i.h~fs-move-pipe-sysctls-to-is-own-file
+++ a/include/linux/pipe_fs_i.h
@@ -238,10 +238,6 @@ void pipe_lock(struct pipe_inode_info *)
void pipe_unlock(struct pipe_inode_info *);
void pipe_double_lock(struct pipe_inode_info *, struct pipe_inode_info *);
-extern unsigned int pipe_max_size;
-extern unsigned long pipe_user_pages_hard;
-extern unsigned long pipe_user_pages_soft;
-
/* Wait for a pipe to be readable/writable while dropping the pipe lock */
void pipe_wait_readable(struct pipe_inode_info *);
void pipe_wait_writable(struct pipe_inode_info *);
--- a/include/linux/sysctl.h~fs-move-pipe-sysctls-to-is-own-file
+++ a/include/linux/sysctl.h
@@ -221,6 +221,12 @@ extern void __register_sysctl_init(const
extern struct ctl_table_header *register_sysctl_mount_point(const char *path);
void do_sysctl_args(void);
+int do_proc_douintvec(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos,
+ int (*conv)(unsigned long *lvalp,
+ unsigned int *valp,
+ int write, void *data),
+ void *data);
extern int pwrsw_enabled;
extern int unaligned_enabled;
--- a/kernel/sysctl.c~fs-move-pipe-sysctls-to-is-own-file
+++ a/kernel/sysctl.c
@@ -57,7 +57,6 @@
#include <linux/ftrace.h>
#include <linux/perf_event.h>
#include <linux/kprobes.h>
-#include <linux/pipe_fs_i.h>
#include <linux/oom.h>
#include <linux/kmod.h>
#include <linux/capability.h>
@@ -761,12 +760,12 @@ static int __do_proc_douintvec(void *tbl
return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
}
-static int do_proc_douintvec(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos,
- int (*conv)(unsigned long *lvalp,
- unsigned int *valp,
- int write, void *data),
- void *data)
+int do_proc_douintvec(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos,
+ int (*conv)(unsigned long *lvalp,
+ unsigned int *valp,
+ int write, void *data),
+ void *data)
{
return __do_proc_douintvec(table->data, table, write,
buffer, lenp, ppos, conv, data);
@@ -1090,33 +1089,6 @@ int proc_dou8vec_minmax(struct ctl_table
}
EXPORT_SYMBOL_GPL(proc_dou8vec_minmax);
-static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
- unsigned int *valp,
- int write, void *data)
-{
- if (write) {
- unsigned int val;
-
- val = round_pipe_size(*lvalp);
- if (val == 0)
- return -EINVAL;
-
- *valp = val;
- } else {
- unsigned int val = *valp;
- *lvalp = (unsigned long) val;
- }
-
- return 0;
-}
-
-static int proc_dopipe_max_size(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
-{
- return do_proc_douintvec(table, write, buffer, lenp, ppos,
- do_proc_dopipe_max_size_conv, NULL);
-}
-
#ifdef CONFIG_MAGIC_SYSRQ
static int sysrq_sysctl_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
@@ -2841,27 +2813,6 @@ static struct ctl_table vm_table[] = {
static struct ctl_table fs_table[] = {
{
- .procname = "pipe-max-size",
- .data = &pipe_max_size,
- .maxlen = sizeof(pipe_max_size),
- .mode = 0644,
- .proc_handler = proc_dopipe_max_size,
- },
- {
- .procname = "pipe-user-pages-hard",
- .data = &pipe_user_pages_hard,
- .maxlen = sizeof(pipe_user_pages_hard),
- .mode = 0644,
- .proc_handler = proc_doulongvec_minmax,
- },
- {
- .procname = "pipe-user-pages-soft",
- .data = &pipe_user_pages_soft,
- .maxlen = sizeof(pipe_user_pages_soft),
- .mode = 0644,
- .proc_handler = proc_doulongvec_minmax,
- },
- {
.procname = "mount-max",
.data = &sysctl_mount_max,
.maxlen = sizeof(unsigned int),
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 36/69] sysctl: add and use base directory declarer and registration helper
2022-01-22 6:10 incoming Andrew Morton
` (34 preceding siblings ...)
2022-01-22 6:13 ` [patch 35/69] fs: move pipe sysctls to is " Andrew Morton
@ 2022-01-22 6:13 ` Andrew Morton
2022-01-22 6:13 ` [patch 37/69] fs: move namespace sysctls and declare fs base directory Andrew Morton
` (32 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:13 UTC (permalink / raw)
To: akpm, anil.s.keshavamurthy, christian.brauner, crope, davem,
ebiederm, ebiggers, keescook, kernel, linux-mm, mcgrof, mhiramat,
mm-commits, naveen.n.rao, nixiaoming, steve, torvalds, viro,
yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: sysctl: add and use base directory declarer and registration helper
Patch series "sysctl: add and use base directory declarer and registration helper".
In this patch series we start addressing base directories, and so we start
with the "fs" sysctls. The end goal is we end up completely moving all
"fs" sysctl knobs out from kernel/sysctl.
This patch (of 6):
Add a set of helpers which can be used to declare and register base
directory sysctls on their own. We do this so we can later move each of
the base sysctl directories like "fs", "kernel", etc, to their own
respective files instead of shoving the declarations and registrations all
on kernel/sysctl.c. The lazy approach has caught up and with this, we
just end up extending the list of base directories / sysctls on one file
and this makes maintenance difficult due to merge conflicts from many
developers.
The declarations are used first by kernel/sysctl.c for registration its
own base which over time we'll try to clean up. It will be used in the
next patch to demonstrate how to cleanly deal with base sysctl
directories.
[mcgrof@kernel.org: null-terminate the ctl_table arrays]
Link: https://lkml.kernel.org/r/YafJY3rXDYnjK/gs@bombadil.infradead.org
Link: https://lkml.kernel.org/r/20211129211943.640266-1-mcgrof@kernel.org
Link: https://lkml.kernel.org/r/20211129211943.640266-2-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Kees Cook <keescook@chromium.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/proc/proc_sysctl.c | 9 ++++++++
include/linux/sysctl.h | 24 ++++++++++++++++++++++
kernel/sysctl.c | 41 +++++++++------------------------------
3 files changed, 43 insertions(+), 31 deletions(-)
--- a/fs/proc/proc_sysctl.c~sysctl-add-and-use-base-directory-declarer-and-registration-helper
+++ a/fs/proc/proc_sysctl.c
@@ -1646,6 +1646,15 @@ struct ctl_table_header *register_sysctl
}
EXPORT_SYMBOL(register_sysctl_table);
+int __register_sysctl_base(struct ctl_table *base_table)
+{
+ struct ctl_table_header *hdr;
+
+ hdr = register_sysctl_table(base_table);
+ kmemleak_not_leak(hdr);
+ return 0;
+}
+
static void put_links(struct ctl_table_header *header)
{
struct ctl_table_set *root_set = &sysctl_table_root.default_set;
--- a/include/linux/sysctl.h~sysctl-add-and-use-base-directory-declarer-and-registration-helper
+++ a/include/linux/sysctl.h
@@ -194,6 +194,20 @@ struct ctl_path {
#ifdef CONFIG_SYSCTL
+#define DECLARE_SYSCTL_BASE(_name, _table) \
+static struct ctl_table _name##_base_table[] = { \
+ { \
+ .procname = #_name, \
+ .mode = 0555, \
+ .child = _table, \
+ }, \
+ { }, \
+}
+
+extern int __register_sysctl_base(struct ctl_table *base_table);
+
+#define register_sysctl_base(_name) __register_sysctl_base(_name##_base_table)
+
void proc_sys_poll_notify(struct ctl_table_poll *poll);
extern void setup_sysctl_set(struct ctl_table_set *p,
@@ -236,6 +250,16 @@ extern int no_unaligned_warning;
extern struct ctl_table sysctl_mount_point[];
#else /* CONFIG_SYSCTL */
+
+#define DECLARE_SYSCTL_BASE(_name, _table)
+
+static inline int __register_sysctl_base(struct ctl_table *base_table)
+{
+ return 0;
+}
+
+#define register_sysctl_base(table) __register_sysctl_base(table)
+
static inline struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
{
return NULL;
--- a/kernel/sysctl.c~sysctl-add-and-use-base-directory-declarer-and-registration-helper
+++ a/kernel/sysctl.c
@@ -2851,41 +2851,20 @@ static struct ctl_table dev_table[] = {
{ }
};
-static struct ctl_table sysctl_base_table[] = {
- {
- .procname = "kernel",
- .mode = 0555,
- .child = kern_table,
- },
- {
- .procname = "vm",
- .mode = 0555,
- .child = vm_table,
- },
- {
- .procname = "fs",
- .mode = 0555,
- .child = fs_table,
- },
- {
- .procname = "debug",
- .mode = 0555,
- .child = debug_table,
- },
- {
- .procname = "dev",
- .mode = 0555,
- .child = dev_table,
- },
- { }
-};
+DECLARE_SYSCTL_BASE(kernel, kern_table);
+DECLARE_SYSCTL_BASE(vm, vm_table);
+DECLARE_SYSCTL_BASE(fs, fs_table);
+DECLARE_SYSCTL_BASE(debug, debug_table);
+DECLARE_SYSCTL_BASE(dev, dev_table);
int __init sysctl_init(void)
{
- struct ctl_table_header *hdr;
+ register_sysctl_base(kernel);
+ register_sysctl_base(vm);
+ register_sysctl_base(fs);
+ register_sysctl_base(debug);
+ register_sysctl_base(dev);
- hdr = register_sysctl_table(sysctl_base_table);
- kmemleak_not_leak(hdr);
return 0;
}
#endif /* CONFIG_SYSCTL */
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 37/69] fs: move namespace sysctls and declare fs base directory
2022-01-22 6:10 incoming Andrew Morton
` (35 preceding siblings ...)
2022-01-22 6:13 ` [patch 36/69] sysctl: add and use base directory declarer and registration helper Andrew Morton
@ 2022-01-22 6:13 ` Andrew Morton
2022-01-22 6:13 ` [patch 38/69] kernel/sysctl.c: rename sysctl_init() to sysctl_init_bases() Andrew Morton
` (31 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:13 UTC (permalink / raw)
To: akpm, anil.s.keshavamurthy, christian.brauner, crope, davem,
ebiederm, ebiggers, keescook, kernel, linux-mm, mcgrof, mhiramat,
mm-commits, naveen.n.rao, nixiaoming, steve, torvalds, viro,
yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: fs: move namespace sysctls and declare fs base directory
This moves the namespace sysctls to its own file as part of the
kernel/sysctl.c spring cleaning
Since we have now removed all sysctls for "fs", we now have to declare it
on the filesystem code, we do that using the new helper, which reduces
boiler plate code.
We rename init_fs_shared_sysctls() to init_fs_sysctls() to reflect that
now fs/sysctls.c is taking on the burden of being the first to register
the base directory as well.
Lastly, since init code will load in the order in which we link it we have
to move the sysctl code to be linked in early, so that its early init
routine runs prior to other fs code. This way, other filesystem code can
register their own sysctls using the helpers after this:
* register_sysctl_init()
* register_sysctl()
Link: https://lkml.kernel.org/r/20211129211943.640266-3-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/Makefile | 3 ++-
fs/namespace.c | 24 +++++++++++++++++++++++-
fs/sysctls.c | 9 +++++----
include/linux/mount.h | 3 ---
kernel/sysctl.c | 14 --------------
5 files changed, 30 insertions(+), 23 deletions(-)
--- a/fs/Makefile~fs-move-namespace-sysctls-and-declare-fs-base-directory
+++ a/fs/Makefile
@@ -6,6 +6,8 @@
# Rewritten to use lists instead of if-statements.
#
+obj-$(CONFIG_SYSCTL) += sysctls.o
+
obj-y := open.o read_write.o file_table.o super.o \
char_dev.o stat.o exec.o pipe.o namei.o fcntl.o \
ioctl.o readdir.o select.o dcache.o inode.o \
@@ -28,7 +30,6 @@ obj-y += notify/
obj-$(CONFIG_EPOLL) += eventpoll.o
obj-y += anon_inodes.o
obj-$(CONFIG_SIGNALFD) += signalfd.o
-obj-$(CONFIG_SYSCTL) += sysctls.o
obj-$(CONFIG_TIMERFD) += timerfd.o
obj-$(CONFIG_EVENTFD) += eventfd.o
obj-$(CONFIG_USERFAULTFD) += userfaultfd.o
--- a/fs/namespace.c~fs-move-namespace-sysctls-and-declare-fs-base-directory
+++ a/fs/namespace.c
@@ -37,7 +37,7 @@
#include "internal.h"
/* Maximum number of mounts in a mount namespace */
-unsigned int sysctl_mount_max __read_mostly = 100000;
+static unsigned int sysctl_mount_max __read_mostly = 100000;
static unsigned int m_hash_mask __read_mostly;
static unsigned int m_hash_shift __read_mostly;
@@ -4620,3 +4620,25 @@ const struct proc_ns_operations mntns_op
.install = mntns_install,
.owner = mntns_owner,
};
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table fs_namespace_sysctls[] = {
+ {
+ .procname = "mount-max",
+ .data = &sysctl_mount_max,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ONE,
+ },
+ { }
+};
+
+static int __init init_fs_namespace_sysctls(void)
+{
+ register_sysctl_init("fs", fs_namespace_sysctls);
+ return 0;
+}
+fs_initcall(init_fs_namespace_sysctls);
+
+#endif /* CONFIG_SYSCTL */
--- a/fs/sysctls.c~fs-move-namespace-sysctls-and-declare-fs-base-directory
+++ a/fs/sysctls.c
@@ -29,10 +29,11 @@ static struct ctl_table fs_shared_sysctl
{ }
};
-static int __init init_fs_shared_sysctls(void)
+DECLARE_SYSCTL_BASE(fs, fs_shared_sysctls);
+
+static int __init init_fs_sysctls(void)
{
- register_sysctl_init("fs", fs_shared_sysctls);
- return 0;
+ return register_sysctl_base(fs);
}
-early_initcall(init_fs_shared_sysctls);
+early_initcall(init_fs_sysctls);
--- a/include/linux/mount.h~fs-move-namespace-sysctls-and-declare-fs-base-directory
+++ a/include/linux/mount.h
@@ -113,9 +113,6 @@ extern void mnt_set_expiry(struct vfsmou
extern void mark_mounts_for_expiry(struct list_head *mounts);
extern dev_t name_to_dev_t(const char *name);
-
-extern unsigned int sysctl_mount_max;
-
extern bool path_is_mountpoint(const struct path *path);
extern void kern_unmount_array(struct vfsmount *mnt[], unsigned int num);
--- a/kernel/sysctl.c~fs-move-namespace-sysctls-and-declare-fs-base-directory
+++ a/kernel/sysctl.c
@@ -2811,18 +2811,6 @@ static struct ctl_table vm_table[] = {
{ }
};
-static struct ctl_table fs_table[] = {
- {
- .procname = "mount-max",
- .data = &sysctl_mount_max,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ONE,
- },
- { }
-};
-
static struct ctl_table debug_table[] = {
#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
{
@@ -2853,7 +2841,6 @@ static struct ctl_table dev_table[] = {
DECLARE_SYSCTL_BASE(kernel, kern_table);
DECLARE_SYSCTL_BASE(vm, vm_table);
-DECLARE_SYSCTL_BASE(fs, fs_table);
DECLARE_SYSCTL_BASE(debug, debug_table);
DECLARE_SYSCTL_BASE(dev, dev_table);
@@ -2861,7 +2848,6 @@ int __init sysctl_init(void)
{
register_sysctl_base(kernel);
register_sysctl_base(vm);
- register_sysctl_base(fs);
register_sysctl_base(debug);
register_sysctl_base(dev);
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 38/69] kernel/sysctl.c: rename sysctl_init() to sysctl_init_bases()
2022-01-22 6:10 incoming Andrew Morton
` (36 preceding siblings ...)
2022-01-22 6:13 ` [patch 37/69] fs: move namespace sysctls and declare fs base directory Andrew Morton
@ 2022-01-22 6:13 ` Andrew Morton
2022-01-22 6:13 ` [patch 39/69] printk: fix build warning when CONFIG_PRINTK=n Andrew Morton
` (30 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:13 UTC (permalink / raw)
To: akpm, anil.s.keshavamurthy, christian.brauner, crope, davem,
ebiederm, ebiggers, keescook, kernel, linux-mm, mcgrof, mhiramat,
mm-commits, naveen.n.rao, nixiaoming, steve, torvalds, viro,
yzaikin
From: Luis Chamberlain <mcgrof@kernel.org>
Subject: kernel/sysctl.c: rename sysctl_init() to sysctl_init_bases()
Rename sysctl_init() to sysctl_init_bases() so to reflect exactly what
this is doing.
Link: https://lkml.kernel.org/r/20211129211943.640266-4-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
arch/arm/mm/alignment.c | 2 +-
arch/sh/mm/alignment.c | 2 +-
fs/proc/proc_sysctl.c | 4 ++--
include/linux/sysctl.h | 2 +-
kernel/sysctl.c | 2 +-
5 files changed, 6 insertions(+), 6 deletions(-)
--- a/arch/arm/mm/alignment.c~kernel-sysctlc-rename-sysctl_init-to-sysctl_init_bases
+++ a/arch/arm/mm/alignment.c
@@ -1005,7 +1005,7 @@ static int __init noalign_setup(char *__
__setup("noalign", noalign_setup);
/*
- * This needs to be done after sysctl_init, otherwise sys/ will be
+ * This needs to be done after sysctl_init_bases(), otherwise sys/ will be
* overwritten. Actually, this shouldn't be in sys/ at all since
* it isn't a sysctl, and it doesn't contain sysctl information.
* We now locate it in /proc/cpu/alignment instead.
--- a/arch/sh/mm/alignment.c~kernel-sysctlc-rename-sysctl_init-to-sysctl_init_bases
+++ a/arch/sh/mm/alignment.c
@@ -161,7 +161,7 @@ static const struct proc_ops alignment_p
};
/*
- * This needs to be done after sysctl_init, otherwise sys/ will be
+ * This needs to be done after sysctl_init_bases(), otherwise sys/ will be
* overwritten. Actually, this shouldn't be in sys/ at all since
* it isn't a sysctl, and it doesn't contain sysctl information.
* We now locate it in /proc/cpu/alignment instead.
--- a/fs/proc/proc_sysctl.c~kernel-sysctlc-rename-sysctl_init-to-sysctl_init_bases
+++ a/fs/proc/proc_sysctl.c
@@ -1419,7 +1419,7 @@ EXPORT_SYMBOL(register_sysctl);
* Context: Can only be called after your respective sysctl base path has been
* registered. So for instance, most base directories are registered early on
* init before init levels are processed through proc_sys_init() and
- * sysctl_init().
+ * sysctl_init_bases().
*/
void __init __register_sysctl_init(const char *path, struct ctl_table *table,
const char *table_name)
@@ -1768,7 +1768,7 @@ int __init proc_sys_init(void)
proc_sys_root->proc_dir_ops = &proc_sys_dir_file_operations;
proc_sys_root->nlink = 0;
- return sysctl_init();
+ return sysctl_init_bases();
}
struct sysctl_alias {
--- a/include/linux/sysctl.h~kernel-sysctlc-rename-sysctl_init-to-sysctl_init_bases
+++ a/include/linux/sysctl.h
@@ -228,7 +228,7 @@ struct ctl_table_header *register_sysctl
void unregister_sysctl_table(struct ctl_table_header * table);
-extern int sysctl_init(void);
+extern int sysctl_init_bases(void);
extern void __register_sysctl_init(const char *path, struct ctl_table *table,
const char *table_name);
#define register_sysctl_init(path, table) __register_sysctl_init(path, table, #table)
--- a/kernel/sysctl.c~kernel-sysctlc-rename-sysctl_init-to-sysctl_init_bases
+++ a/kernel/sysctl.c
@@ -2844,7 +2844,7 @@ DECLARE_SYSCTL_BASE(vm, vm_table);
DECLARE_SYSCTL_BASE(debug, debug_table);
DECLARE_SYSCTL_BASE(dev, dev_table);
-int __init sysctl_init(void)
+int __init sysctl_init_bases(void)
{
register_sysctl_base(kernel);
register_sysctl_base(vm);
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 39/69] printk: fix build warning when CONFIG_PRINTK=n
2022-01-22 6:10 incoming Andrew Morton
` (37 preceding siblings ...)
2022-01-22 6:13 ` [patch 38/69] kernel/sysctl.c: rename sysctl_init() to sysctl_init_bases() Andrew Morton
@ 2022-01-22 6:13 ` Andrew Morton
2022-01-22 6:13 ` [patch 40/69] fs/coredump: move coredump sysctls into its own file Andrew Morton
` (29 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:13 UTC (permalink / raw)
To: akpm, anil.s.keshavamurthy, christian.brauner, crope, davem,
ebiederm, ebiggers, keescook, kernel, linux-mm, mcgrof, mhiramat,
mm-commits, naveen.n.rao, nixiaoming, steve, torvalds, viro,
yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: printk: fix build warning when CONFIG_PRINTK=n
build warning when CONFIG_PRINTK=n
kernel/printk/printk.c:175:5: warning: no previous prototype for
'devkmsg_sysctl_set_loglvl' [-Wmissing-prototypes]
devkmsg_sysctl_set_loglvl() is only used in sysctl.c when CONFIG_PRINTK=y,
but it participates in the build when CONFIG_PRINTK=n. So add compile
dependency CONFIG_PRINTK=y && CONFIG_SYSCTL=y to fix the build warning.
Link: https://lkml.kernel.org/r/20211129211943.640266-5-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Cc: Stephen Kitt <steve@sk2.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/printk.h | 4 ----
kernel/printk/internal.h | 2 ++
kernel/printk/printk.c | 3 ++-
3 files changed, 4 insertions(+), 5 deletions(-)
--- a/include/linux/printk.h~printk-fix-build-warning-when-config_printk=n
+++ a/include/linux/printk.h
@@ -183,10 +183,6 @@ extern bool printk_timed_ratelimit(unsig
extern int printk_delay_msec;
extern int dmesg_restrict;
-extern int
-devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write, void *buf,
- size_t *lenp, loff_t *ppos);
-
extern void wake_up_klogd(void);
char *log_buf_addr_get(void);
--- a/kernel/printk/internal.h~printk-fix-build-warning-when-config_printk=n
+++ a/kernel/printk/internal.h
@@ -6,6 +6,8 @@
#if defined(CONFIG_PRINTK) && defined(CONFIG_SYSCTL)
void __init printk_sysctl_init(void);
+int devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos);
#else
#define printk_sysctl_init() do { } while (0)
#endif
--- a/kernel/printk/printk.c~printk-fix-build-warning-when-config_printk=n
+++ a/kernel/printk/printk.c
@@ -171,7 +171,7 @@ static int __init control_devkmsg(char *
__setup("printk.devkmsg=", control_devkmsg);
char devkmsg_log_str[DEVKMSG_STR_MAX_SIZE] = "ratelimit";
-
+#if defined(CONFIG_PRINTK) && defined(CONFIG_SYSCTL)
int devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
@@ -210,6 +210,7 @@ int devkmsg_sysctl_set_loglvl(struct ctl
return 0;
}
+#endif /* CONFIG_PRINTK && CONFIG_SYSCTL */
/* Number of registered extended console drivers. */
static int nr_ext_console_drivers;
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 40/69] fs/coredump: move coredump sysctls into its own file
2022-01-22 6:10 incoming Andrew Morton
` (38 preceding siblings ...)
2022-01-22 6:13 ` [patch 39/69] printk: fix build warning when CONFIG_PRINTK=n Andrew Morton
@ 2022-01-22 6:13 ` Andrew Morton
2022-01-22 6:13 ` [patch 41/69] kprobe: move sysctl_kprobes_optimization to kprobes.c Andrew Morton
` (28 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:13 UTC (permalink / raw)
To: akpm, anil.s.keshavamurthy, christian.brauner, crope, davem,
ebiederm, ebiggers, keescook, kernel, linux-mm, mcgrof, mhiramat,
mm-commits, naveen.n.rao, nixiaoming, steve, torvalds, viro,
yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: fs/coredump: move coredump sysctls into its own file
This moves the fs/coredump.c respective sysctls to its own file.
Link: https://lkml.kernel.org/r/20211129211943.640266-6-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Cc: Stephen Kitt <steve@sk2.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/coredump.c | 66 ++++++++++++++++++++++++++++++++++---
fs/exec.c | 55 ------------------------------
include/linux/coredump.h | 10 +++--
kernel/sysctl.c | 2 -
4 files changed, 67 insertions(+), 66 deletions(-)
--- a/fs/coredump.c~fs-coredump-move-coredump-sysctls-into-its-own-file
+++ a/fs/coredump.c
@@ -41,6 +41,7 @@
#include <linux/fs.h>
#include <linux/path.h>
#include <linux/timekeeping.h>
+#include <linux/sysctl.h>
#include <linux/uaccess.h>
#include <asm/mmu_context.h>
@@ -52,9 +53,9 @@
#include <trace/events/sched.h>
-int core_uses_pid;
-unsigned int core_pipe_limit;
-char core_pattern[CORENAME_MAX_SIZE] = "core";
+static int core_uses_pid;
+static unsigned int core_pipe_limit;
+static char core_pattern[CORENAME_MAX_SIZE] = "core";
static int core_name_size = CORENAME_MAX_SIZE;
struct core_name {
@@ -62,8 +63,6 @@ struct core_name {
int used, size;
};
-/* The maximal length of core_pattern is also specified in sysctl.c */
-
static int expand_corename(struct core_name *cn, int size)
{
char *corename = krealloc(cn->corename, size, GFP_KERNEL);
@@ -893,6 +892,63 @@ int dump_align(struct coredump_params *c
}
EXPORT_SYMBOL(dump_align);
+#ifdef CONFIG_SYSCTL
+
+void validate_coredump_safety(void)
+{
+ if (suid_dumpable == SUID_DUMP_ROOT &&
+ core_pattern[0] != '/' && core_pattern[0] != '|') {
+ pr_warn(
+"Unsafe core_pattern used with fs.suid_dumpable=2.\n"
+"Pipe handler or fully qualified core dump path required.\n"
+"Set kernel.core_pattern before fs.suid_dumpable.\n"
+ );
+ }
+}
+
+static int proc_dostring_coredump(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ int error = proc_dostring(table, write, buffer, lenp, ppos);
+
+ if (!error)
+ validate_coredump_safety();
+ return error;
+}
+
+static struct ctl_table coredump_sysctls[] = {
+ {
+ .procname = "core_uses_pid",
+ .data = &core_uses_pid,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "core_pattern",
+ .data = core_pattern,
+ .maxlen = CORENAME_MAX_SIZE,
+ .mode = 0644,
+ .proc_handler = proc_dostring_coredump,
+ },
+ {
+ .procname = "core_pipe_limit",
+ .data = &core_pipe_limit,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ { }
+};
+
+static int __init init_fs_coredump_sysctls(void)
+{
+ register_sysctl_init("kernel", coredump_sysctls);
+ return 0;
+}
+fs_initcall(init_fs_coredump_sysctls);
+#endif /* CONFIG_SYSCTL */
+
/*
* The purpose of always_dump_vma() is to make sure that special kernel mappings
* that are useful for post-mortem analysis are included in every core dump.
--- a/fs/exec.c~fs-coredump-move-coredump-sysctls-into-its-own-file
+++ a/fs/exec.c
@@ -2103,20 +2103,6 @@ COMPAT_SYSCALL_DEFINE5(execveat, int, fd
#ifdef CONFIG_SYSCTL
-static void validate_coredump_safety(void)
-{
-#ifdef CONFIG_COREDUMP
- if (suid_dumpable == SUID_DUMP_ROOT &&
- core_pattern[0] != '/' && core_pattern[0] != '|') {
- pr_warn(
-"Unsafe core_pattern used with fs.suid_dumpable=2.\n"
-"Pipe handler or fully qualified core dump path required.\n"
-"Set kernel.core_pattern before fs.suid_dumpable.\n"
- );
- }
-#endif
-}
-
static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
@@ -2140,50 +2126,9 @@ static struct ctl_table fs_exec_sysctls[
{ }
};
-#ifdef CONFIG_COREDUMP
-
-static int proc_dostring_coredump(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
-{
- int error = proc_dostring(table, write, buffer, lenp, ppos);
-
- if (!error)
- validate_coredump_safety();
- return error;
-}
-
-static struct ctl_table kernel_exec_sysctls[] = {
- {
- .procname = "core_uses_pid",
- .data = &core_uses_pid,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "core_pattern",
- .data = core_pattern,
- .maxlen = CORENAME_MAX_SIZE,
- .mode = 0644,
- .proc_handler = proc_dostring_coredump,
- },
- {
- .procname = "core_pipe_limit",
- .data = &core_pipe_limit,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- { }
-};
-#endif
-
static int __init init_fs_exec_sysctls(void)
{
register_sysctl_init("fs", fs_exec_sysctls);
-#ifdef CONFIG_COREDUMP
- register_sysctl_init("kernel", kernel_exec_sysctls);
-#endif
return 0;
}
--- a/include/linux/coredump.h~fs-coredump-move-coredump-sysctls-into-its-own-file
+++ a/include/linux/coredump.h
@@ -14,10 +14,6 @@ struct core_vma_metadata {
unsigned long dump_size;
};
-extern int core_uses_pid;
-extern char core_pattern[];
-extern unsigned int core_pipe_limit;
-
/*
* These are the only things you should do on a core-file: use only these
* functions to write out all the necessary info.
@@ -37,4 +33,10 @@ extern void do_coredump(const kernel_sig
static inline void do_coredump(const kernel_siginfo_t *siginfo) {}
#endif
+#if defined(CONFIG_COREDUMP) && defined(CONFIG_SYSCTL)
+extern void validate_coredump_safety(void);
+#else
+static inline void validate_coredump_safety(void) {}
+#endif
+
#endif /* _LINUX_COREDUMP_H */
--- a/kernel/sysctl.c~fs-coredump-move-coredump-sysctls-into-its-own-file
+++ a/kernel/sysctl.c
@@ -62,12 +62,10 @@
#include <linux/capability.h>
#include <linux/binfmts.h>
#include <linux/sched/sysctl.h>
-#include <linux/sched/coredump.h>
#include <linux/kexec.h>
#include <linux/bpf.h>
#include <linux/mount.h>
#include <linux/userfaultfd_k.h>
-#include <linux/coredump.h>
#include <linux/latencytop.h>
#include <linux/pid.h>
#include <linux/delayacct.h>
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 41/69] kprobe: move sysctl_kprobes_optimization to kprobes.c
2022-01-22 6:10 incoming Andrew Morton
` (39 preceding siblings ...)
2022-01-22 6:13 ` [patch 40/69] fs/coredump: move coredump sysctls into its own file Andrew Morton
@ 2022-01-22 6:13 ` Andrew Morton
2022-01-22 6:13 ` [patch 42/69] kernel/sysctl.c: remove unused variable ten_thousand Andrew Morton
` (27 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:13 UTC (permalink / raw)
To: akpm, anil.s.keshavamurthy, christian.brauner, crope, davem,
ebiederm, ebiggers, keescook, kernel, linux-mm, mcgrof, mhiramat,
mm-commits, naveen.n.rao, nixiaoming, steve, torvalds, viro,
yzaikin
From: Xiaoming Ni <nixiaoming@huawei.com>
Subject: kprobe: move sysctl_kprobes_optimization to kprobes.c
kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.
To help with this maintenance let's start by moving sysctls to places
where they actually belong. The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we just
care about the core logic.
Move sysctl_kprobes_optimization from kernel/sysctl.c to kernel/kprobes.c.
Use register_sysctl() to register the sysctl interface.
[mcgrof@kernel.org: fix compile issue when CONFIG_OPTPROBES is disabled]
Link: https://lkml.kernel.org/r/20211129211943.640266-7-mcgrof@kernel.org
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Cc: Stephen Kitt <steve@sk2.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/kprobes.h | 6 ------
kernel/kprobes.c | 30 ++++++++++++++++++++++++++----
kernel/sysctl.c | 12 ------------
3 files changed, 26 insertions(+), 22 deletions(-)
--- a/include/linux/kprobes.h~kprobe-move-sysctl_kprobes_optimization-to-kprobesc
+++ a/include/linux/kprobes.h
@@ -348,12 +348,6 @@ extern void opt_pre_handler(struct kprob
DEFINE_INSN_CACHE_OPS(optinsn);
-#ifdef CONFIG_SYSCTL
-extern int sysctl_kprobes_optimization;
-extern int proc_kprobes_optimization_handler(struct ctl_table *table,
- int write, void *buffer,
- size_t *length, loff_t *ppos);
-#endif /* CONFIG_SYSCTL */
extern void wait_for_kprobe_optimizer(void);
#else /* !CONFIG_OPTPROBES */
static inline void wait_for_kprobe_optimizer(void) { }
--- a/kernel/kprobes.c~kprobe-move-sysctl_kprobes_optimization-to-kprobesc
+++ a/kernel/kprobes.c
@@ -48,6 +48,9 @@
#define KPROBE_HASH_BITS 6
#define KPROBE_TABLE_SIZE (1 << KPROBE_HASH_BITS)
+#if !defined(CONFIG_OPTPROBES) || !defined(CONFIG_SYSCTL)
+#define kprobe_sysctls_init() do { } while (0)
+#endif
static int kprobes_initialized;
/* kprobe_table can be accessed by
@@ -938,10 +941,10 @@ static void unoptimize_all_kprobes(void)
}
static DEFINE_MUTEX(kprobe_sysctl_mutex);
-int sysctl_kprobes_optimization;
-int proc_kprobes_optimization_handler(struct ctl_table *table, int write,
- void *buffer, size_t *length,
- loff_t *ppos)
+static int sysctl_kprobes_optimization;
+static int proc_kprobes_optimization_handler(struct ctl_table *table,
+ int write, void *buffer,
+ size_t *length, loff_t *ppos)
{
int ret;
@@ -957,6 +960,24 @@ int proc_kprobes_optimization_handler(st
return ret;
}
+
+static struct ctl_table kprobe_sysctls[] = {
+ {
+ .procname = "kprobes-optimization",
+ .data = &sysctl_kprobes_optimization,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_kprobes_optimization_handler,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+ {}
+};
+
+static void __init kprobe_sysctls_init(void)
+{
+ register_sysctl_init("debug", kprobe_sysctls);
+}
#endif /* CONFIG_SYSCTL */
/* Put a breakpoint for a probe. */
@@ -2584,6 +2605,7 @@ static int __init init_kprobes(void)
err = register_module_notifier(&kprobe_module_nb);
kprobes_initialized = (err == 0);
+ kprobe_sysctls_init();
return err;
}
early_initcall(init_kprobes);
--- a/kernel/sysctl.c~kprobe-move-sysctl_kprobes_optimization-to-kprobesc
+++ a/kernel/sysctl.c
@@ -56,7 +56,6 @@
#include <linux/reboot.h>
#include <linux/ftrace.h>
#include <linux/perf_event.h>
-#include <linux/kprobes.h>
#include <linux/oom.h>
#include <linux/kmod.h>
#include <linux/capability.h>
@@ -2819,17 +2818,6 @@ static struct ctl_table debug_table[] =
.proc_handler = proc_dointvec
},
#endif
-#if defined(CONFIG_OPTPROBES)
- {
- .procname = "kprobes-optimization",
- .data = &sysctl_kprobes_optimization,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_kprobes_optimization_handler,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
-#endif
{ }
};
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 42/69] kernel/sysctl.c: remove unused variable ten_thousand
2022-01-22 6:10 incoming Andrew Morton
` (40 preceding siblings ...)
2022-01-22 6:13 ` [patch 41/69] kprobe: move sysctl_kprobes_optimization to kprobes.c Andrew Morton
@ 2022-01-22 6:13 ` Andrew Morton
2022-01-22 6:13 ` [patch 43/69] sysctl: returns -EINVAL when a negative value is passed to proc_doulongvec_minmax Andrew Morton
` (26 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:13 UTC (permalink / raw)
To: akpm, colin.i.king, linux-mm, mcgrof, mm-commits, torvalds
From: Colin Ian King <colin.i.king@gmail.com>
Subject: kernel/sysctl.c: remove unused variable ten_thousand
The const variable ten_thousand is not used, it is redundant and can be
removed.
Cleans up clang warning:
kernel/sysctl.c:99:18: warning: unused variable 'ten_thousand' [-Wunused-const-variable]
static const int ten_thousand = 10000;
Link: https://lkml.kernel.org/r/20211221184501.574670-1-colin.i.king@gmail.com
Fixes: c26da54dc8ca ("printk: move printk sysctl to printk/sysctl.c")
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Acked-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
kernel/sysctl.c | 3 ---
1 file changed, 3 deletions(-)
--- a/kernel/sysctl.c~kernel-sysctlc-remove-unused-variable-ten_thousand
+++ a/kernel/sysctl.c
@@ -96,9 +96,6 @@
/* Constants used for minimum and maximum */
-#ifdef CONFIG_PRINTK
-static const int ten_thousand = 10000;
-#endif
#ifdef CONFIG_PERF_EVENTS
static const int six_hundred_forty_kb = 640 * 1024;
#endif
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 43/69] sysctl: returns -EINVAL when a negative value is passed to proc_doulongvec_minmax
2022-01-22 6:10 incoming Andrew Morton
` (41 preceding siblings ...)
2022-01-22 6:13 ` [patch 42/69] kernel/sysctl.c: remove unused variable ten_thousand Andrew Morton
@ 2022-01-22 6:13 ` Andrew Morton
2022-01-22 6:13 ` [patch 44/69] zsmalloc: introduce some helper functions Andrew Morton
` (25 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:13 UTC (permalink / raw)
To: akpm, hulkci, libaokun1, linux-mm, mcgrof, mm-commits, torvalds
From: Baokun Li <libaokun1@huawei.com>
Subject: sysctl: returns -EINVAL when a negative value is passed to proc_doulongvec_minmax
When we pass a negative value to the proc_doulongvec_minmax() function,
the function returns 0, but the corresponding interface value does not
change.
we can easily reproduce this problem with the following commands:
cd /proc/sys/fs/epoll
echo -1 > max_user_watches; echo $?; cat max_user_watches
This function requires a non-negative number to be passed in, so when
a negative number is passed in, -EINVAL is returned.
Link: https://lkml.kernel.org/r/20211220092627.3744624-1-libaokun1@huawei.com
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reported-by: Hulk Robot <hulkci@huawei.com>
Acked-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
kernel/sysctl.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- a/kernel/sysctl.c~sysctl-returns-einval-when-a-negative-value-is-passed-to-proc_doulongvec_minmax
+++ a/kernel/sysctl.c
@@ -1145,10 +1145,11 @@ static int __do_proc_doulongvec_minmax(v
err = proc_get_long(&p, &left, &val, &neg,
proc_wspace_sep,
sizeof(proc_wspace_sep), NULL);
- if (err)
+ if (err || neg) {
+ err = -EINVAL;
break;
- if (neg)
- continue;
+ }
+
val = convmul * val / convdiv;
if ((min && val < *min) || (max && val > *max)) {
err = -EINVAL;
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 44/69] zsmalloc: introduce some helper functions
2022-01-22 6:10 incoming Andrew Morton
` (42 preceding siblings ...)
2022-01-22 6:13 ` [patch 43/69] sysctl: returns -EINVAL when a negative value is passed to proc_doulongvec_minmax Andrew Morton
@ 2022-01-22 6:13 ` Andrew Morton
2022-01-22 6:13 ` [patch 45/69] zsmalloc: rename zs_stat_type to class_stat_type Andrew Morton
` (24 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:13 UTC (permalink / raw)
To: akpm, bigeasy, linux-mm, minchan, mm-commits, peterz, tglx,
torvalds, umgwanakikbuti
From: Minchan Kim <minchan@kernel.org>
Subject: zsmalloc: introduce some helper functions
Patch series "zsmalloc: remove bit_spin_lock", v2.
zsmalloc uses bit_spin_lock to minimize space overhead since it's zpage
granularity lock. However, it causes zsmalloc non-working under
PREEMPT_RT as well as adding too much complication.
This patchset tries to replace the bit_spin_lock with per-pool rwlock. It
also removes unnecessary zspage isolation logic from class, which was the
other part too much complication added into zsmalloc.
Last patch changes the get_cpu_var to local_lock to make it work in
PREEMPT_RT.
This patch (of 9):
get_zspage_mapping returns fullness as well as class_idx. However, the
fullness is usually not used since it could be stale in some contexts. It
causes misleading as well as unnecessary instructions so this patch
introduces zspage_class.
obj_to_location also produces page and index but we don't need always the
index, either so this patch introduces obj_to_page.
Link: https://lkml.kernel.org/r/20211115185909.3949505-1-minchan@kernel.org
Link: https://lkml.kernel.org/r/20211115185909.3949505-2-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/zsmalloc.c | 54 ++++++++++++++++++++----------------------------
1 file changed, 23 insertions(+), 31 deletions(-)
--- a/mm/zsmalloc.c~zsmalloc-introduce-some-helper-functions
+++ a/mm/zsmalloc.c
@@ -517,6 +517,12 @@ static void get_zspage_mapping(struct zs
*class_idx = zspage->class;
}
+static struct size_class *zspage_class(struct zs_pool *pool,
+ struct zspage *zspage)
+{
+ return pool->size_class[zspage->class];
+}
+
static void set_zspage_mapping(struct zspage *zspage,
unsigned int class_idx,
enum fullness_group fullness)
@@ -844,6 +850,12 @@ static void obj_to_location(unsigned lon
*obj_idx = (obj & OBJ_INDEX_MASK);
}
+static void obj_to_page(unsigned long obj, struct page **page)
+{
+ obj >>= OBJ_TAG_BITS;
+ *page = pfn_to_page(obj >> OBJ_INDEX_BITS);
+}
+
/**
* location_to_obj - get obj value encoded from (<page>, <obj_idx>)
* @page: page object resides in zspage
@@ -1246,8 +1258,6 @@ void *zs_map_object(struct zs_pool *pool
unsigned long obj, off;
unsigned int obj_idx;
- unsigned int class_idx;
- enum fullness_group fg;
struct size_class *class;
struct mapping_area *area;
struct page *pages[2];
@@ -1270,8 +1280,7 @@ void *zs_map_object(struct zs_pool *pool
/* migration cannot move any subpage in this zspage */
migrate_read_lock(zspage);
- get_zspage_mapping(zspage, &class_idx, &fg);
- class = pool->size_class[class_idx];
+ class = zspage_class(pool, zspage);
off = (class->size * obj_idx) & ~PAGE_MASK;
area = &get_cpu_var(zs_map_area);
@@ -1304,16 +1313,13 @@ void zs_unmap_object(struct zs_pool *poo
unsigned long obj, off;
unsigned int obj_idx;
- unsigned int class_idx;
- enum fullness_group fg;
struct size_class *class;
struct mapping_area *area;
obj = handle_to_obj(handle);
obj_to_location(obj, &page, &obj_idx);
zspage = get_zspage(page);
- get_zspage_mapping(zspage, &class_idx, &fg);
- class = pool->size_class[class_idx];
+ class = zspage_class(pool, zspage);
off = (class->size * obj_idx) & ~PAGE_MASK;
area = this_cpu_ptr(&zs_map_area);
@@ -1491,8 +1497,6 @@ void zs_free(struct zs_pool *pool, unsig
struct zspage *zspage;
struct page *f_page;
unsigned long obj;
- unsigned int f_objidx;
- int class_idx;
struct size_class *class;
enum fullness_group fullness;
bool isolated;
@@ -1502,13 +1506,11 @@ void zs_free(struct zs_pool *pool, unsig
pin_tag(handle);
obj = handle_to_obj(handle);
- obj_to_location(obj, &f_page, &f_objidx);
+ obj_to_page(obj, &f_page);
zspage = get_zspage(f_page);
migrate_read_lock(zspage);
-
- get_zspage_mapping(zspage, &class_idx, &fullness);
- class = pool->size_class[class_idx];
+ class = zspage_class(pool, zspage);
spin_lock(&class->lock);
obj_free(class, obj);
@@ -1866,8 +1868,6 @@ static bool zs_page_isolate(struct page
{
struct zs_pool *pool;
struct size_class *class;
- int class_idx;
- enum fullness_group fullness;
struct zspage *zspage;
struct address_space *mapping;
@@ -1880,15 +1880,10 @@ static bool zs_page_isolate(struct page
zspage = get_zspage(page);
- /*
- * Without class lock, fullness could be stale while class_idx is okay
- * because class_idx is constant unless page is freed so we should get
- * fullness again under class lock.
- */
- get_zspage_mapping(zspage, &class_idx, &fullness);
mapping = page_mapping(page);
pool = mapping->private_data;
- class = pool->size_class[class_idx];
+
+ class = zspage_class(pool, zspage);
spin_lock(&class->lock);
if (get_zspage_inuse(zspage) == 0) {
@@ -1907,6 +1902,9 @@ static bool zs_page_isolate(struct page
* size_class to prevent further object allocation from the zspage.
*/
if (!list_empty(&zspage->list) && !is_zspage_isolated(zspage)) {
+ enum fullness_group fullness;
+ unsigned int class_idx;
+
get_zspage_mapping(zspage, &class_idx, &fullness);
atomic_long_inc(&pool->isolated_pages);
remove_zspage(class, zspage, fullness);
@@ -1923,8 +1921,6 @@ static int zs_page_migrate(struct addres
{
struct zs_pool *pool;
struct size_class *class;
- int class_idx;
- enum fullness_group fullness;
struct zspage *zspage;
struct page *dummy;
void *s_addr, *d_addr, *addr;
@@ -1949,9 +1945,8 @@ static int zs_page_migrate(struct addres
/* Concurrent compactor cannot migrate any subpage in zspage */
migrate_write_lock(zspage);
- get_zspage_mapping(zspage, &class_idx, &fullness);
pool = mapping->private_data;
- class = pool->size_class[class_idx];
+ class = zspage_class(pool, zspage);
offset = get_first_obj_offset(page);
spin_lock(&class->lock);
@@ -2049,8 +2044,6 @@ static void zs_page_putback(struct page
{
struct zs_pool *pool;
struct size_class *class;
- int class_idx;
- enum fullness_group fg;
struct address_space *mapping;
struct zspage *zspage;
@@ -2058,10 +2051,9 @@ static void zs_page_putback(struct page
VM_BUG_ON_PAGE(!PageIsolated(page), page);
zspage = get_zspage(page);
- get_zspage_mapping(zspage, &class_idx, &fg);
mapping = page_mapping(page);
pool = mapping->private_data;
- class = pool->size_class[class_idx];
+ class = zspage_class(pool, zspage);
spin_lock(&class->lock);
dec_zspage_isolation(zspage);
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 45/69] zsmalloc: rename zs_stat_type to class_stat_type
2022-01-22 6:10 incoming Andrew Morton
` (43 preceding siblings ...)
2022-01-22 6:13 ` [patch 44/69] zsmalloc: introduce some helper functions Andrew Morton
@ 2022-01-22 6:13 ` Andrew Morton
2022-01-22 6:13 ` [patch 46/69] zsmalloc: decouple class actions from zspage works Andrew Morton
` (23 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:13 UTC (permalink / raw)
To: akpm, bigeasy, linux-mm, minchan, mm-commits, peterz,
senozhatsky, tglx, torvalds, umgwanakikbuti
From: Minchan Kim <minchan@kernel.org>
Subject: zsmalloc: rename zs_stat_type to class_stat_type
The stat aims for class stat, not zspage so rename it.
Link: https://lkml.kernel.org/r/20211115185909.3949505-3-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/zsmalloc.c | 24 ++++++++++++------------
1 file changed, 12 insertions(+), 12 deletions(-)
--- a/mm/zsmalloc.c~zsmalloc-rename-zs_stat_type-to-class_stat_type
+++ a/mm/zsmalloc.c
@@ -158,7 +158,7 @@ enum fullness_group {
NR_ZS_FULLNESS,
};
-enum zs_stat_type {
+enum class_stat_type {
CLASS_EMPTY,
CLASS_ALMOST_EMPTY,
CLASS_ALMOST_FULL,
@@ -549,21 +549,21 @@ static int get_size_class_index(int size
return min_t(int, ZS_SIZE_CLASSES - 1, idx);
}
-/* type can be of enum type zs_stat_type or fullness_group */
-static inline void zs_stat_inc(struct size_class *class,
+/* type can be of enum type class_stat_type or fullness_group */
+static inline void class_stat_inc(struct size_class *class,
int type, unsigned long cnt)
{
class->stats.objs[type] += cnt;
}
-/* type can be of enum type zs_stat_type or fullness_group */
-static inline void zs_stat_dec(struct size_class *class,
+/* type can be of enum type class_stat_type or fullness_group */
+static inline void class_stat_dec(struct size_class *class,
int type, unsigned long cnt)
{
class->stats.objs[type] -= cnt;
}
-/* type can be of enum type zs_stat_type or fullness_group */
+/* type can be of enum type class_stat_type or fullness_group */
static inline unsigned long zs_stat_get(struct size_class *class,
int type)
{
@@ -725,7 +725,7 @@ static void insert_zspage(struct size_cl
{
struct zspage *head;
- zs_stat_inc(class, fullness, 1);
+ class_stat_inc(class, fullness, 1);
head = list_first_entry_or_null(&class->fullness_list[fullness],
struct zspage, list);
/*
@@ -750,7 +750,7 @@ static void remove_zspage(struct size_cl
VM_BUG_ON(is_zspage_isolated(zspage));
list_del_init(&zspage->list);
- zs_stat_dec(class, fullness, 1);
+ class_stat_dec(class, fullness, 1);
}
/*
@@ -964,7 +964,7 @@ static void __free_zspage(struct zs_pool
cache_free_zspage(pool, zspage);
- zs_stat_dec(class, OBJ_ALLOCATED, class->objs_per_zspage);
+ class_stat_dec(class, OBJ_ALLOCATED, class->objs_per_zspage);
atomic_long_sub(class->pages_per_zspage,
&pool->pages_allocated);
}
@@ -1394,7 +1394,7 @@ static unsigned long obj_malloc(struct s
kunmap_atomic(vaddr);
mod_zspage_inuse(zspage, 1);
- zs_stat_inc(class, OBJ_USED, 1);
+ class_stat_inc(class, OBJ_USED, 1);
obj = location_to_obj(m_page, obj);
@@ -1458,7 +1458,7 @@ unsigned long zs_malloc(struct zs_pool *
record_obj(handle, obj);
atomic_long_add(class->pages_per_zspage,
&pool->pages_allocated);
- zs_stat_inc(class, OBJ_ALLOCATED, class->objs_per_zspage);
+ class_stat_inc(class, OBJ_ALLOCATED, class->objs_per_zspage);
/* We completely set up zspage so mark them as movable */
SetZsPageMovable(pool, zspage);
@@ -1489,7 +1489,7 @@ static void obj_free(struct size_class *
kunmap_atomic(vaddr);
set_freeobj(zspage, f_objidx);
mod_zspage_inuse(zspage, -1);
- zs_stat_dec(class, OBJ_USED, 1);
+ class_stat_dec(class, OBJ_USED, 1);
}
void zs_free(struct zs_pool *pool, unsigned long handle)
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 46/69] zsmalloc: decouple class actions from zspage works
2022-01-22 6:10 incoming Andrew Morton
` (44 preceding siblings ...)
2022-01-22 6:13 ` [patch 45/69] zsmalloc: rename zs_stat_type to class_stat_type Andrew Morton
@ 2022-01-22 6:13 ` Andrew Morton
2022-01-22 6:14 ` [patch 47/69] zsmalloc: introduce obj_allocated Andrew Morton
` (22 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:13 UTC (permalink / raw)
To: akpm, bigeasy, linux-mm, minchan, mm-commits, peterz,
senozhatsky, tglx, torvalds, umgwanakikbuti
From: Minchan Kim <minchan@kernel.org>
Subject: zsmalloc: decouple class actions from zspage works
This patch moves class stat update out of obj_malloc since it's not
related to zspage operation. This is a preparation to introduce new lock
scheme in next patch.
Link: https://lkml.kernel.org/r/20211115185909.3949505-4-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/zsmalloc.c | 23 +++++++++++++----------
1 file changed, 13 insertions(+), 10 deletions(-)
--- a/mm/zsmalloc.c~zsmalloc-decouple-class-actions-from-zspage-works
+++ a/mm/zsmalloc.c
@@ -1360,17 +1360,19 @@ size_t zs_huge_class_size(struct zs_pool
}
EXPORT_SYMBOL_GPL(zs_huge_class_size);
-static unsigned long obj_malloc(struct size_class *class,
+static unsigned long obj_malloc(struct zs_pool *pool,
struct zspage *zspage, unsigned long handle)
{
int i, nr_page, offset;
unsigned long obj;
struct link_free *link;
+ struct size_class *class;
struct page *m_page;
unsigned long m_offset;
void *vaddr;
+ class = pool->size_class[zspage->class];
handle |= OBJ_ALLOCATED_TAG;
obj = get_freeobj(zspage);
@@ -1394,7 +1396,6 @@ static unsigned long obj_malloc(struct s
kunmap_atomic(vaddr);
mod_zspage_inuse(zspage, 1);
- class_stat_inc(class, OBJ_USED, 1);
obj = location_to_obj(m_page, obj);
@@ -1433,10 +1434,11 @@ unsigned long zs_malloc(struct zs_pool *
spin_lock(&class->lock);
zspage = find_get_zspage(class);
if (likely(zspage)) {
- obj = obj_malloc(class, zspage, handle);
+ obj = obj_malloc(pool, zspage, handle);
/* Now move the zspage to another fullness group, if required */
fix_fullness_group(class, zspage);
record_obj(handle, obj);
+ class_stat_inc(class, OBJ_USED, 1);
spin_unlock(&class->lock);
return handle;
@@ -1451,7 +1453,7 @@ unsigned long zs_malloc(struct zs_pool *
}
spin_lock(&class->lock);
- obj = obj_malloc(class, zspage, handle);
+ obj = obj_malloc(pool, zspage, handle);
newfg = get_fullness_group(class, zspage);
insert_zspage(class, zspage, newfg);
set_zspage_mapping(zspage, class->index, newfg);
@@ -1459,6 +1461,7 @@ unsigned long zs_malloc(struct zs_pool *
atomic_long_add(class->pages_per_zspage,
&pool->pages_allocated);
class_stat_inc(class, OBJ_ALLOCATED, class->objs_per_zspage);
+ class_stat_inc(class, OBJ_USED, 1);
/* We completely set up zspage so mark them as movable */
SetZsPageMovable(pool, zspage);
@@ -1468,7 +1471,7 @@ unsigned long zs_malloc(struct zs_pool *
}
EXPORT_SYMBOL_GPL(zs_malloc);
-static void obj_free(struct size_class *class, unsigned long obj)
+static void obj_free(int class_size, unsigned long obj)
{
struct link_free *link;
struct zspage *zspage;
@@ -1478,7 +1481,7 @@ static void obj_free(struct size_class *
void *vaddr;
obj_to_location(obj, &f_page, &f_objidx);
- f_offset = (class->size * f_objidx) & ~PAGE_MASK;
+ f_offset = (class_size * f_objidx) & ~PAGE_MASK;
zspage = get_zspage(f_page);
vaddr = kmap_atomic(f_page);
@@ -1489,7 +1492,6 @@ static void obj_free(struct size_class *
kunmap_atomic(vaddr);
set_freeobj(zspage, f_objidx);
mod_zspage_inuse(zspage, -1);
- class_stat_dec(class, OBJ_USED, 1);
}
void zs_free(struct zs_pool *pool, unsigned long handle)
@@ -1513,7 +1515,8 @@ void zs_free(struct zs_pool *pool, unsig
class = zspage_class(pool, zspage);
spin_lock(&class->lock);
- obj_free(class, obj);
+ obj_free(class->size, obj);
+ class_stat_dec(class, OBJ_USED, 1);
fullness = fix_fullness_group(class, zspage);
if (fullness != ZS_EMPTY) {
migrate_read_unlock(zspage);
@@ -1671,7 +1674,7 @@ static int migrate_zspage(struct zs_pool
}
used_obj = handle_to_obj(handle);
- free_obj = obj_malloc(class, get_zspage(d_page), handle);
+ free_obj = obj_malloc(pool, get_zspage(d_page), handle);
zs_object_copy(class, free_obj, used_obj);
obj_idx++;
/*
@@ -1683,7 +1686,7 @@ static int migrate_zspage(struct zs_pool
free_obj |= BIT(HANDLE_PIN_BIT);
record_obj(handle, free_obj);
unpin_tag(handle);
- obj_free(class, used_obj);
+ obj_free(class->size, used_obj);
}
/* Remember last position in this iteration */
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 47/69] zsmalloc: introduce obj_allocated
2022-01-22 6:10 incoming Andrew Morton
` (45 preceding siblings ...)
2022-01-22 6:13 ` [patch 46/69] zsmalloc: decouple class actions from zspage works Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:14 ` [patch 48/69] zsmalloc: move huge compressed obj from page to zspage Andrew Morton
` (21 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: akpm, bigeasy, linux-mm, minchan, mm-commits, peterz,
senozhatsky, tglx, torvalds, umgwanakikbuti
From: Minchan Kim <minchan@kernel.org>
Subject: zsmalloc: introduce obj_allocated
The usage pattern for obj_to_head is to check whether the zpage is
allocated or not. Thus, introduce obj_allocated.
Link: https://lkml.kernel.org/r/20211115185909.3949505-5-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/zsmalloc.c | 33 ++++++++++++++++-----------------
1 file changed, 16 insertions(+), 17 deletions(-)
--- a/mm/zsmalloc.c~zsmalloc-introduce-obj_allocated
+++ a/mm/zsmalloc.c
@@ -877,13 +877,21 @@ static unsigned long handle_to_obj(unsig
return *(unsigned long *)handle;
}
-static unsigned long obj_to_head(struct page *page, void *obj)
+static bool obj_allocated(struct page *page, void *obj, unsigned long *phandle)
{
+ unsigned long handle;
+
if (unlikely(PageHugeObject(page))) {
VM_BUG_ON_PAGE(!is_first_page(page), page);
- return page->index;
+ handle = page->index;
} else
- return *(unsigned long *)obj;
+ handle = *(unsigned long *)obj;
+
+ if (!(handle & OBJ_ALLOCATED_TAG))
+ return false;
+
+ *phandle = handle & ~OBJ_ALLOCATED_TAG;
+ return true;
}
static inline int testpin_tag(unsigned long handle)
@@ -1606,7 +1614,6 @@ static void zs_object_copy(struct size_c
static unsigned long find_alloced_obj(struct size_class *class,
struct page *page, int *obj_idx)
{
- unsigned long head;
int offset = 0;
int index = *obj_idx;
unsigned long handle = 0;
@@ -1616,9 +1623,7 @@ static unsigned long find_alloced_obj(st
offset += class->size * index;
while (offset < PAGE_SIZE) {
- head = obj_to_head(page, addr + offset);
- if (head & OBJ_ALLOCATED_TAG) {
- handle = head & ~OBJ_ALLOCATED_TAG;
+ if (obj_allocated(page, addr + offset, &handle)) {
if (trypin_tag(handle))
break;
handle = 0;
@@ -1928,7 +1933,7 @@ static int zs_page_migrate(struct addres
struct page *dummy;
void *s_addr, *d_addr, *addr;
int offset, pos;
- unsigned long handle, head;
+ unsigned long handle;
unsigned long old_obj, new_obj;
unsigned int obj_idx;
int ret = -EAGAIN;
@@ -1964,9 +1969,7 @@ static int zs_page_migrate(struct addres
pos = offset;
s_addr = kmap_atomic(page);
while (pos < PAGE_SIZE) {
- head = obj_to_head(page, s_addr + pos);
- if (head & OBJ_ALLOCATED_TAG) {
- handle = head & ~OBJ_ALLOCATED_TAG;
+ if (obj_allocated(page, s_addr + pos, &handle)) {
if (!trypin_tag(handle))
goto unpin_objects;
}
@@ -1982,9 +1985,7 @@ static int zs_page_migrate(struct addres
for (addr = s_addr + offset; addr < s_addr + pos;
addr += class->size) {
- head = obj_to_head(page, addr);
- if (head & OBJ_ALLOCATED_TAG) {
- handle = head & ~OBJ_ALLOCATED_TAG;
+ if (obj_allocated(page, addr, &handle)) {
BUG_ON(!testpin_tag(handle));
old_obj = handle_to_obj(handle);
@@ -2029,9 +2030,7 @@ static int zs_page_migrate(struct addres
unpin_objects:
for (addr = s_addr + offset; addr < s_addr + pos;
addr += class->size) {
- head = obj_to_head(page, addr);
- if (head & OBJ_ALLOCATED_TAG) {
- handle = head & ~OBJ_ALLOCATED_TAG;
+ if (obj_allocated(page, addr, &handle)) {
BUG_ON(!testpin_tag(handle));
unpin_tag(handle);
}
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 48/69] zsmalloc: move huge compressed obj from page to zspage
2022-01-22 6:10 incoming Andrew Morton
` (46 preceding siblings ...)
2022-01-22 6:14 ` [patch 47/69] zsmalloc: introduce obj_allocated Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:14 ` [patch 49/69] zsmalloc: remove zspage isolation for migration Andrew Morton
` (20 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: akpm, bigeasy, linux-mm, minchan, mm-commits, peterz,
senozhatsky, tglx, torvalds, umgwanakikbuti
From: Minchan Kim <minchan@kernel.org>
Subject: zsmalloc: move huge compressed obj from page to zspage
The flag aims for zspage, not per page. Let's move it to zspage.
Link: https://lkml.kernel.org/r/20211115185909.3949505-6-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/zsmalloc.c | 50 ++++++++++++++++++++++++------------------------
1 file changed, 26 insertions(+), 24 deletions(-)
--- a/mm/zsmalloc.c~zsmalloc-move-huge-compressed-obj-from-page-to-zspage
+++ a/mm/zsmalloc.c
@@ -121,6 +121,7 @@
#define OBJ_INDEX_BITS (BITS_PER_LONG - _PFN_BITS - OBJ_TAG_BITS)
#define OBJ_INDEX_MASK ((_AC(1, UL) << OBJ_INDEX_BITS) - 1)
+#define HUGE_BITS 1
#define FULLNESS_BITS 2
#define CLASS_BITS 8
#define ISOLATED_BITS 3
@@ -213,22 +214,6 @@ struct size_class {
struct zs_size_stat stats;
};
-/* huge object: pages_per_zspage == 1 && maxobj_per_zspage == 1 */
-static void SetPageHugeObject(struct page *page)
-{
- SetPageOwnerPriv1(page);
-}
-
-static void ClearPageHugeObject(struct page *page)
-{
- ClearPageOwnerPriv1(page);
-}
-
-static int PageHugeObject(struct page *page)
-{
- return PageOwnerPriv1(page);
-}
-
/*
* Placed within free objects to form a singly linked list.
* For every zspage, zspage->freeobj gives head of this list.
@@ -278,6 +263,7 @@ struct zs_pool {
struct zspage {
struct {
+ unsigned int huge:HUGE_BITS;
unsigned int fullness:FULLNESS_BITS;
unsigned int class:CLASS_BITS + 1;
unsigned int isolated:ISOLATED_BITS;
@@ -298,6 +284,17 @@ struct mapping_area {
enum zs_mapmode vm_mm; /* mapping mode */
};
+/* huge object: pages_per_zspage == 1 && maxobj_per_zspage == 1 */
+static void SetZsHugePage(struct zspage *zspage)
+{
+ zspage->huge = 1;
+}
+
+static bool ZsHugePage(struct zspage *zspage)
+{
+ return zspage->huge;
+}
+
#ifdef CONFIG_COMPACTION
static int zs_register_migration(struct zs_pool *pool);
static void zs_unregister_migration(struct zs_pool *pool);
@@ -830,7 +827,9 @@ static struct zspage *get_zspage(struct
static struct page *get_next_page(struct page *page)
{
- if (unlikely(PageHugeObject(page)))
+ struct zspage *zspage = get_zspage(page);
+
+ if (unlikely(ZsHugePage(zspage)))
return NULL;
return (struct page *)page->index;
@@ -880,8 +879,9 @@ static unsigned long handle_to_obj(unsig
static bool obj_allocated(struct page *page, void *obj, unsigned long *phandle)
{
unsigned long handle;
+ struct zspage *zspage = get_zspage(page);
- if (unlikely(PageHugeObject(page))) {
+ if (unlikely(ZsHugePage(zspage))) {
VM_BUG_ON_PAGE(!is_first_page(page), page);
handle = page->index;
} else
@@ -920,7 +920,6 @@ static void reset_page(struct page *page
ClearPagePrivate(page);
set_page_private(page, 0);
page_mapcount_reset(page);
- ClearPageHugeObject(page);
page->index = 0;
}
@@ -1062,7 +1061,7 @@ static void create_page_chain(struct siz
SetPagePrivate(page);
if (unlikely(class->objs_per_zspage == 1 &&
class->pages_per_zspage == 1))
- SetPageHugeObject(page);
+ SetZsHugePage(zspage);
} else {
prev_page->index = (unsigned long)page;
}
@@ -1307,7 +1306,7 @@ void *zs_map_object(struct zs_pool *pool
ret = __zs_map_object(area, pages, off, class->size);
out:
- if (likely(!PageHugeObject(page)))
+ if (likely(!ZsHugePage(zspage)))
ret += ZS_HANDLE_SIZE;
return ret;
@@ -1395,7 +1394,7 @@ static unsigned long obj_malloc(struct z
vaddr = kmap_atomic(m_page);
link = (struct link_free *)vaddr + m_offset / sizeof(*link);
set_freeobj(zspage, link->next >> OBJ_TAG_BITS);
- if (likely(!PageHugeObject(m_page)))
+ if (likely(!ZsHugePage(zspage)))
/* record handle in the header of allocated chunk */
link->handle = handle;
else
@@ -1496,7 +1495,10 @@ static void obj_free(int class_size, uns
/* Insert this object in containing zspage's freelist */
link = (struct link_free *)(vaddr + f_offset);
- link->next = get_freeobj(zspage) << OBJ_TAG_BITS;
+ if (likely(!ZsHugePage(zspage)))
+ link->next = get_freeobj(zspage) << OBJ_TAG_BITS;
+ else
+ f_page->index = 0;
kunmap_atomic(vaddr);
set_freeobj(zspage, f_objidx);
mod_zspage_inuse(zspage, -1);
@@ -1867,7 +1869,7 @@ static void replace_sub_page(struct size
create_page_chain(class, zspage, pages);
set_first_obj_offset(newpage, get_first_obj_offset(oldpage));
- if (unlikely(PageHugeObject(oldpage)))
+ if (unlikely(ZsHugePage(zspage)))
newpage->index = oldpage->index;
__SetPageMovable(newpage, page_mapping(oldpage));
}
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 49/69] zsmalloc: remove zspage isolation for migration
2022-01-22 6:10 incoming Andrew Morton
` (47 preceding siblings ...)
2022-01-22 6:14 ` [patch 48/69] zsmalloc: move huge compressed obj from page to zspage Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:14 ` [patch 50/69] locking/rwlocks: introduce write_lock_nested Andrew Morton
` (19 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: akpm, bigeasy, linux-mm, minchan, mm-commits, peterz,
senozhatsky, tglx, torvalds, umgwanakikbuti
From: Minchan Kim <minchan@kernel.org>
Subject: zsmalloc: remove zspage isolation for migration
zspage isolation for migration introduced additional exceptions to be
dealt with since the zspage was isolated from class list. The reason why
I isolated zspage from class list was to prevent race between obj_malloc
and page migration via allocating zpage from the zspage further. However,
it couldn't prevent object freeing from zspage so it needed corner case
handling.
This patch removes the whole mess. Now, we are fine since class->lock and
zspage->lock can prevent the race.
Link: https://lkml.kernel.org/r/20211115185909.3949505-7-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/zsmalloc.c | 157 ++----------------------------------------------
1 file changed, 8 insertions(+), 149 deletions(-)
--- a/mm/zsmalloc.c~zsmalloc-remove-zspage-isolation-for-migration
+++ a/mm/zsmalloc.c
@@ -254,10 +254,6 @@ struct zs_pool {
#ifdef CONFIG_COMPACTION
struct inode *inode;
struct work_struct free_work;
- /* A wait queue for when migration races with async_free_zspage() */
- struct wait_queue_head migration_wait;
- atomic_long_t isolated_pages;
- bool destroying;
#endif
};
@@ -454,11 +450,6 @@ MODULE_ALIAS("zpool-zsmalloc");
/* per-cpu VM mapping areas for zspage accesses that cross page boundaries */
static DEFINE_PER_CPU(struct mapping_area, zs_map_area);
-static bool is_zspage_isolated(struct zspage *zspage)
-{
- return zspage->isolated;
-}
-
static __maybe_unused int is_first_page(struct page *page)
{
return PagePrivate(page);
@@ -744,7 +735,6 @@ static void remove_zspage(struct size_cl
enum fullness_group fullness)
{
VM_BUG_ON(list_empty(&class->fullness_list[fullness]));
- VM_BUG_ON(is_zspage_isolated(zspage));
list_del_init(&zspage->list);
class_stat_dec(class, fullness, 1);
@@ -770,13 +760,9 @@ static enum fullness_group fix_fullness_
if (newfg == currfg)
goto out;
- if (!is_zspage_isolated(zspage)) {
- remove_zspage(class, zspage, currfg);
- insert_zspage(class, zspage, newfg);
- }
-
+ remove_zspage(class, zspage, currfg);
+ insert_zspage(class, zspage, newfg);
set_zspage_mapping(zspage, class_idx, newfg);
-
out:
return newfg;
}
@@ -1511,7 +1497,6 @@ void zs_free(struct zs_pool *pool, unsig
unsigned long obj;
struct size_class *class;
enum fullness_group fullness;
- bool isolated;
if (unlikely(!handle))
return;
@@ -1533,11 +1518,9 @@ void zs_free(struct zs_pool *pool, unsig
goto out;
}
- isolated = is_zspage_isolated(zspage);
migrate_read_unlock(zspage);
/* If zspage is isolated, zs_page_putback will free the zspage */
- if (likely(!isolated))
- free_zspage(pool, class, zspage);
+ free_zspage(pool, class, zspage);
out:
spin_unlock(&class->lock);
@@ -1718,7 +1701,6 @@ static struct zspage *isolate_zspage(str
zspage = list_first_entry_or_null(&class->fullness_list[fg[i]],
struct zspage, list);
if (zspage) {
- VM_BUG_ON(is_zspage_isolated(zspage));
remove_zspage(class, zspage, fg[i]);
return zspage;
}
@@ -1739,8 +1721,6 @@ static enum fullness_group putback_zspag
{
enum fullness_group fullness;
- VM_BUG_ON(is_zspage_isolated(zspage));
-
fullness = get_fullness_group(class, zspage);
insert_zspage(class, zspage, fullness);
set_zspage_mapping(zspage, class->index, fullness);
@@ -1822,35 +1802,10 @@ static void inc_zspage_isolation(struct
static void dec_zspage_isolation(struct zspage *zspage)
{
+ VM_BUG_ON(zspage->isolated == 0);
zspage->isolated--;
}
-static void putback_zspage_deferred(struct zs_pool *pool,
- struct size_class *class,
- struct zspage *zspage)
-{
- enum fullness_group fg;
-
- fg = putback_zspage(class, zspage);
- if (fg == ZS_EMPTY)
- schedule_work(&pool->free_work);
-
-}
-
-static inline void zs_pool_dec_isolated(struct zs_pool *pool)
-{
- VM_BUG_ON(atomic_long_read(&pool->isolated_pages) <= 0);
- atomic_long_dec(&pool->isolated_pages);
- /*
- * Checking pool->destroying must happen after atomic_long_dec()
- * for pool->isolated_pages above. Paired with the smp_mb() in
- * zs_unregister_migration().
- */
- smp_mb__after_atomic();
- if (atomic_long_read(&pool->isolated_pages) == 0 && pool->destroying)
- wake_up_all(&pool->migration_wait);
-}
-
static void replace_sub_page(struct size_class *class, struct zspage *zspage,
struct page *newpage, struct page *oldpage)
{
@@ -1876,10 +1831,7 @@ static void replace_sub_page(struct size
static bool zs_page_isolate(struct page *page, isolate_mode_t mode)
{
- struct zs_pool *pool;
- struct size_class *class;
struct zspage *zspage;
- struct address_space *mapping;
/*
* Page is locked so zspage couldn't be destroyed. For detail, look at
@@ -1889,39 +1841,9 @@ static bool zs_page_isolate(struct page
VM_BUG_ON_PAGE(PageIsolated(page), page);
zspage = get_zspage(page);
-
- mapping = page_mapping(page);
- pool = mapping->private_data;
-
- class = zspage_class(pool, zspage);
-
- spin_lock(&class->lock);
- if (get_zspage_inuse(zspage) == 0) {
- spin_unlock(&class->lock);
- return false;
- }
-
- /* zspage is isolated for object migration */
- if (list_empty(&zspage->list) && !is_zspage_isolated(zspage)) {
- spin_unlock(&class->lock);
- return false;
- }
-
- /*
- * If this is first time isolation for the zspage, isolate zspage from
- * size_class to prevent further object allocation from the zspage.
- */
- if (!list_empty(&zspage->list) && !is_zspage_isolated(zspage)) {
- enum fullness_group fullness;
- unsigned int class_idx;
-
- get_zspage_mapping(zspage, &class_idx, &fullness);
- atomic_long_inc(&pool->isolated_pages);
- remove_zspage(class, zspage, fullness);
- }
-
+ migrate_write_lock(zspage);
inc_zspage_isolation(zspage);
- spin_unlock(&class->lock);
+ migrate_write_unlock(zspage);
return true;
}
@@ -2004,21 +1926,6 @@ static int zs_page_migrate(struct addres
dec_zspage_isolation(zspage);
- /*
- * Page migration is done so let's putback isolated zspage to
- * the list if @page is final isolated subpage in the zspage.
- */
- if (!is_zspage_isolated(zspage)) {
- /*
- * We cannot race with zs_destroy_pool() here because we wait
- * for isolation to hit zero before we start destroying.
- * Also, we ensure that everyone can see pool->destroying before
- * we start waiting.
- */
- putback_zspage_deferred(pool, class, zspage);
- zs_pool_dec_isolated(pool);
- }
-
if (page_zone(newpage) != page_zone(page)) {
dec_zone_page_state(page, NR_ZSPAGES);
inc_zone_page_state(newpage, NR_ZSPAGES);
@@ -2046,30 +1953,15 @@ unpin_objects:
static void zs_page_putback(struct page *page)
{
- struct zs_pool *pool;
- struct size_class *class;
- struct address_space *mapping;
struct zspage *zspage;
VM_BUG_ON_PAGE(!PageMovable(page), page);
VM_BUG_ON_PAGE(!PageIsolated(page), page);
zspage = get_zspage(page);
- mapping = page_mapping(page);
- pool = mapping->private_data;
- class = zspage_class(pool, zspage);
-
- spin_lock(&class->lock);
+ migrate_write_lock(zspage);
dec_zspage_isolation(zspage);
- if (!is_zspage_isolated(zspage)) {
- /*
- * Due to page_lock, we cannot free zspage immediately
- * so let's defer.
- */
- putback_zspage_deferred(pool, class, zspage);
- zs_pool_dec_isolated(pool);
- }
- spin_unlock(&class->lock);
+ migrate_write_unlock(zspage);
}
static const struct address_space_operations zsmalloc_aops = {
@@ -2091,36 +1983,8 @@ static int zs_register_migration(struct
return 0;
}
-static bool pool_isolated_are_drained(struct zs_pool *pool)
-{
- return atomic_long_read(&pool->isolated_pages) == 0;
-}
-
-/* Function for resolving migration */
-static void wait_for_isolated_drain(struct zs_pool *pool)
-{
-
- /*
- * We're in the process of destroying the pool, so there are no
- * active allocations. zs_page_isolate() fails for completely free
- * zspages, so we need only wait for the zs_pool's isolated
- * count to hit zero.
- */
- wait_event(pool->migration_wait,
- pool_isolated_are_drained(pool));
-}
-
static void zs_unregister_migration(struct zs_pool *pool)
{
- pool->destroying = true;
- /*
- * We need a memory barrier here to ensure global visibility of
- * pool->destroying. Thus pool->isolated pages will either be 0 in which
- * case we don't care, or it will be > 0 and pool->destroying will
- * ensure that we wake up once isolation hits 0.
- */
- smp_mb();
- wait_for_isolated_drain(pool); /* This can block */
flush_work(&pool->free_work);
iput(pool->inode);
}
@@ -2150,7 +2014,6 @@ static void async_free_zspage(struct wor
spin_unlock(&class->lock);
}
-
list_for_each_entry_safe(zspage, tmp, &free_pages, list) {
list_del(&zspage->list);
lock_zspage(zspage);
@@ -2363,10 +2226,6 @@ struct zs_pool *zs_create_pool(const cha
if (!pool->name)
goto err;
-#ifdef CONFIG_COMPACTION
- init_waitqueue_head(&pool->migration_wait);
-#endif
-
if (create_cache(pool))
goto err;
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 50/69] locking/rwlocks: introduce write_lock_nested
2022-01-22 6:10 incoming Andrew Morton
` (48 preceding siblings ...)
2022-01-22 6:14 ` [patch 49/69] zsmalloc: remove zspage isolation for migration Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:14 ` [patch 51/69] zsmalloc: replace per zpage lock with pool->migrate_lock Andrew Morton
` (18 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: akpm, bigeasy, linux-mm, minchan, mm-commits, naresh.kamboju,
peterz, senozhatsky, tglx, torvalds, umgwanakikbuti
From: Minchan Kim <minchan@kernel.org>
Subject: locking/rwlocks: introduce write_lock_nested
In preparation for converting bit_spin_lock to rwlock in zsmalloc so that
multiple writers of zspages can run at the same time but those zspages are
supposed to be different zspage instance. Thus, it's not deadlock. This
patch adds write_lock_nested to support the case for LOCKDEP.
[minchan@kernel.org: fix write_lock_nested for RT]
Link: https://lkml.kernel.org/r/YZfrMTAXV56HFWJY@google.com
[bigeasy@linutronix.de: fixup write_lock_nested() implementation]
Link: https://lkml.kernel.org/r/20211123170134.y6xb7pmpgdn4m3bn@linutronix.de
Link: https://lkml.kernel.org/r/20211115185909.3949505-8-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/rwlock.h | 6 ++++++
include/linux/rwlock_api_smp.h | 8 ++++++++
include/linux/rwlock_rt.h | 10 ++++++++++
include/linux/spinlock_api_up.h | 1 +
kernel/locking/spinlock.c | 10 ++++++++++
kernel/locking/spinlock_rt.c | 12 ++++++++++++
6 files changed, 47 insertions(+)
--- a/include/linux/rwlock_api_smp.h~locking-rwlocks-introduce-write_lock_nested
+++ a/include/linux/rwlock_api_smp.h
@@ -17,6 +17,7 @@
void __lockfunc _raw_read_lock(rwlock_t *lock) __acquires(lock);
void __lockfunc _raw_write_lock(rwlock_t *lock) __acquires(lock);
+void __lockfunc _raw_write_lock_nested(rwlock_t *lock, int subclass) __acquires(lock);
void __lockfunc _raw_read_lock_bh(rwlock_t *lock) __acquires(lock);
void __lockfunc _raw_write_lock_bh(rwlock_t *lock) __acquires(lock);
void __lockfunc _raw_read_lock_irq(rwlock_t *lock) __acquires(lock);
@@ -209,6 +210,13 @@ static inline void __raw_write_lock(rwlo
LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
}
+static inline void __raw_write_lock_nested(rwlock_t *lock, int subclass)
+{
+ preempt_disable();
+ rwlock_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
+ LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
+}
+
#endif /* !CONFIG_GENERIC_LOCKBREAK || CONFIG_DEBUG_LOCK_ALLOC */
static inline void __raw_write_unlock(rwlock_t *lock)
--- a/include/linux/rwlock.h~locking-rwlocks-introduce-write_lock_nested
+++ a/include/linux/rwlock.h
@@ -55,6 +55,12 @@ do { \
#define write_lock(lock) _raw_write_lock(lock)
#define read_lock(lock) _raw_read_lock(lock)
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+#define write_lock_nested(lock, subclass) _raw_write_lock_nested(lock, subclass)
+#else
+#define write_lock_nested(lock, subclass) _raw_write_lock(lock)
+#endif
+
#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
#define read_lock_irqsave(lock, flags) \
--- a/include/linux/rwlock_rt.h~locking-rwlocks-introduce-write_lock_nested
+++ a/include/linux/rwlock_rt.h
@@ -28,6 +28,7 @@ extern void rt_read_lock(rwlock_t *rwloc
extern int rt_read_trylock(rwlock_t *rwlock);
extern void rt_read_unlock(rwlock_t *rwlock);
extern void rt_write_lock(rwlock_t *rwlock);
+extern void rt_write_lock_nested(rwlock_t *rwlock, int subclass);
extern int rt_write_trylock(rwlock_t *rwlock);
extern void rt_write_unlock(rwlock_t *rwlock);
@@ -83,6 +84,15 @@ static __always_inline void write_lock(r
rt_write_lock(rwlock);
}
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static __always_inline void write_lock_nested(rwlock_t *rwlock, int subclass)
+{
+ rt_write_lock_nested(rwlock, subclass);
+}
+#else
+#define write_lock_nested(lock, subclass) rt_write_lock(((void)(subclass), (lock)))
+#endif
+
static __always_inline void write_lock_bh(rwlock_t *rwlock)
{
local_bh_disable();
--- a/include/linux/spinlock_api_up.h~locking-rwlocks-introduce-write_lock_nested
+++ a/include/linux/spinlock_api_up.h
@@ -59,6 +59,7 @@
#define _raw_spin_lock_nested(lock, subclass) __LOCK(lock)
#define _raw_read_lock(lock) __LOCK(lock)
#define _raw_write_lock(lock) __LOCK(lock)
+#define _raw_write_lock_nested(lock, subclass) __LOCK(lock)
#define _raw_spin_lock_bh(lock) __LOCK_BH(lock)
#define _raw_read_lock_bh(lock) __LOCK_BH(lock)
#define _raw_write_lock_bh(lock) __LOCK_BH(lock)
--- a/kernel/locking/spinlock.c~locking-rwlocks-introduce-write_lock_nested
+++ a/kernel/locking/spinlock.c
@@ -300,6 +300,16 @@ void __lockfunc _raw_write_lock(rwlock_t
__raw_write_lock(lock);
}
EXPORT_SYMBOL(_raw_write_lock);
+
+#ifndef CONFIG_DEBUG_LOCK_ALLOC
+#define __raw_write_lock_nested(lock, subclass) __raw_write_lock(((void)(subclass), (lock)))
+#endif
+
+void __lockfunc _raw_write_lock_nested(rwlock_t *lock, int subclass)
+{
+ __raw_write_lock_nested(lock, subclass);
+}
+EXPORT_SYMBOL(_raw_write_lock_nested);
#endif
#ifndef CONFIG_INLINE_WRITE_LOCK_IRQSAVE
--- a/kernel/locking/spinlock_rt.c~locking-rwlocks-introduce-write_lock_nested
+++ a/kernel/locking/spinlock_rt.c
@@ -239,6 +239,18 @@ void __sched rt_write_lock(rwlock_t *rwl
}
EXPORT_SYMBOL(rt_write_lock);
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+void __sched rt_write_lock_nested(rwlock_t *rwlock, int subclass)
+{
+ rtlock_might_resched();
+ rwlock_acquire(&rwlock->dep_map, subclass, 0, _RET_IP_);
+ rwbase_write_lock(&rwlock->rwbase, TASK_RTLOCK_WAIT);
+ rcu_read_lock();
+ migrate_disable();
+}
+EXPORT_SYMBOL(rt_write_lock_nested);
+#endif
+
void __sched rt_read_unlock(rwlock_t *rwlock)
{
rwlock_release(&rwlock->dep_map, _RET_IP_);
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 51/69] zsmalloc: replace per zpage lock with pool->migrate_lock
2022-01-22 6:10 incoming Andrew Morton
` (49 preceding siblings ...)
2022-01-22 6:14 ` [patch 50/69] locking/rwlocks: introduce write_lock_nested Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:14 ` [patch 52/69] zsmalloc: replace get_cpu_var with local_lock Andrew Morton
` (17 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: akpm, bigeasy, linux-mm, minchan, mm-commits, peterz,
senozhatsky, tglx, torvalds, umgwanakikbuti
From: Minchan Kim <minchan@kernel.org>
Subject: zsmalloc: replace per zpage lock with pool->migrate_lock
The zsmalloc has used a bit for spin_lock in zpage handle to keep zpage
object alive during several operations. However, it causes the problem
for PREEMPT_RT as well as introducing too complicated.
This patch replaces the bit spin_lock with pool->migrate_lock rwlock. It
could make the code simple as well as zsmalloc work under PREEMPT_RT.
The drawback is the pool->migrate_lock is bigger granuarity than per zpage
lock so the contention would be higher than old when both IO-related
operations(i.e., zsmalloc, zsfree, zs_[map|unmap]) and
compaction(page/zpage migration) are going in parallel(*, the migrate_lock
is rwlock and IO related functions are all read side lock so there is no
contention). However, the write-side is fast enough(dominant overhead is
just page copy) so it wouldn't affect much. If the lock granurity becomes
more problem later, we could introduce table locks based on handle as a
hash value.
Link: https://lkml.kernel.org/r/20211115185909.3949505-9-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/zsmalloc.c | 205 ++++++++++++++++++++++--------------------------
1 file changed, 96 insertions(+), 109 deletions(-)
--- a/mm/zsmalloc.c~zsmalloc-replace-per-zpage-lock-with-pool-migrate_lock
+++ a/mm/zsmalloc.c
@@ -30,6 +30,14 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+/*
+ * lock ordering:
+ * page_lock
+ * pool->migrate_lock
+ * class->lock
+ * zspage->lock
+ */
+
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
@@ -101,15 +109,6 @@
#define _PFN_BITS (MAX_POSSIBLE_PHYSMEM_BITS - PAGE_SHIFT)
/*
- * Memory for allocating for handle keeps object position by
- * encoding <page, obj_idx> and the encoded value has a room
- * in least bit(ie, look at obj_to_location).
- * We use the bit to synchronize between object access by
- * user and migration.
- */
-#define HANDLE_PIN_BIT 0
-
-/*
* Head in allocated object should have OBJ_ALLOCATED_TAG
* to identify the object was allocated or not.
* It's okay to add the status bit in the least bit because
@@ -255,6 +254,8 @@ struct zs_pool {
struct inode *inode;
struct work_struct free_work;
#endif
+ /* protect page/zspage migration */
+ rwlock_t migrate_lock;
};
struct zspage {
@@ -297,6 +298,9 @@ static void zs_unregister_migration(stru
static void migrate_lock_init(struct zspage *zspage);
static void migrate_read_lock(struct zspage *zspage);
static void migrate_read_unlock(struct zspage *zspage);
+static void migrate_write_lock(struct zspage *zspage);
+static void migrate_write_lock_nested(struct zspage *zspage);
+static void migrate_write_unlock(struct zspage *zspage);
static void kick_deferred_free(struct zs_pool *pool);
static void init_deferred_free(struct zs_pool *pool);
static void SetZsPageMovable(struct zs_pool *pool, struct zspage *zspage);
@@ -308,6 +312,9 @@ static void zs_unregister_migration(stru
static void migrate_lock_init(struct zspage *zspage) {}
static void migrate_read_lock(struct zspage *zspage) {}
static void migrate_read_unlock(struct zspage *zspage) {}
+static void migrate_write_lock(struct zspage *zspage) {}
+static void migrate_write_lock_nested(struct zspage *zspage) {}
+static void migrate_write_unlock(struct zspage *zspage) {}
static void kick_deferred_free(struct zs_pool *pool) {}
static void init_deferred_free(struct zs_pool *pool) {}
static void SetZsPageMovable(struct zs_pool *pool, struct zspage *zspage) {}
@@ -359,14 +366,10 @@ static void cache_free_zspage(struct zs_
kmem_cache_free(pool->zspage_cachep, zspage);
}
+/* class->lock(which owns the handle) synchronizes races */
static void record_obj(unsigned long handle, unsigned long obj)
{
- /*
- * lsb of @obj represents handle lock while other bits
- * represent object value the handle is pointing so
- * updating shouldn't do store tearing.
- */
- WRITE_ONCE(*(unsigned long *)handle, obj);
+ *(unsigned long *)handle = obj;
}
/* zpool driver */
@@ -880,26 +883,6 @@ static bool obj_allocated(struct page *p
return true;
}
-static inline int testpin_tag(unsigned long handle)
-{
- return bit_spin_is_locked(HANDLE_PIN_BIT, (unsigned long *)handle);
-}
-
-static inline int trypin_tag(unsigned long handle)
-{
- return bit_spin_trylock(HANDLE_PIN_BIT, (unsigned long *)handle);
-}
-
-static void pin_tag(unsigned long handle) __acquires(bitlock)
-{
- bit_spin_lock(HANDLE_PIN_BIT, (unsigned long *)handle);
-}
-
-static void unpin_tag(unsigned long handle) __releases(bitlock)
-{
- bit_spin_unlock(HANDLE_PIN_BIT, (unsigned long *)handle);
-}
-
static void reset_page(struct page *page)
{
__ClearPageMovable(page);
@@ -968,6 +951,11 @@ static void free_zspage(struct zs_pool *
VM_BUG_ON(get_zspage_inuse(zspage));
VM_BUG_ON(list_empty(&zspage->list));
+ /*
+ * Since zs_free couldn't be sleepable, this function cannot call
+ * lock_page. The page locks trylock_zspage got will be released
+ * by __free_zspage.
+ */
if (!trylock_zspage(zspage)) {
kick_deferred_free(pool);
return;
@@ -1263,15 +1251,20 @@ void *zs_map_object(struct zs_pool *pool
*/
BUG_ON(in_interrupt());
- /* From now on, migration cannot move the object */
- pin_tag(handle);
-
+ /* It guarantees it can get zspage from handle safely */
+ read_lock(&pool->migrate_lock);
obj = handle_to_obj(handle);
obj_to_location(obj, &page, &obj_idx);
zspage = get_zspage(page);
- /* migration cannot move any subpage in this zspage */
+ /*
+ * migration cannot move any zpages in this zspage. Here, class->lock
+ * is too heavy since callers would take some time until they calls
+ * zs_unmap_object API so delegate the locking from class to zspage
+ * which is smaller granularity.
+ */
migrate_read_lock(zspage);
+ read_unlock(&pool->migrate_lock);
class = zspage_class(pool, zspage);
off = (class->size * obj_idx) & ~PAGE_MASK;
@@ -1330,7 +1323,6 @@ void zs_unmap_object(struct zs_pool *poo
put_cpu_var(zs_map_area);
migrate_read_unlock(zspage);
- unpin_tag(handle);
}
EXPORT_SYMBOL_GPL(zs_unmap_object);
@@ -1424,6 +1416,7 @@ unsigned long zs_malloc(struct zs_pool *
size += ZS_HANDLE_SIZE;
class = pool->size_class[get_size_class_index(size)];
+ /* class->lock effectively protects the zpage migration */
spin_lock(&class->lock);
zspage = find_get_zspage(class);
if (likely(zspage)) {
@@ -1501,30 +1494,27 @@ void zs_free(struct zs_pool *pool, unsig
if (unlikely(!handle))
return;
- pin_tag(handle);
+ /*
+ * The pool->migrate_lock protects the race with zpage's migration
+ * so it's safe to get the page from handle.
+ */
+ read_lock(&pool->migrate_lock);
obj = handle_to_obj(handle);
obj_to_page(obj, &f_page);
zspage = get_zspage(f_page);
-
- migrate_read_lock(zspage);
class = zspage_class(pool, zspage);
-
spin_lock(&class->lock);
+ read_unlock(&pool->migrate_lock);
+
obj_free(class->size, obj);
class_stat_dec(class, OBJ_USED, 1);
fullness = fix_fullness_group(class, zspage);
- if (fullness != ZS_EMPTY) {
- migrate_read_unlock(zspage);
+ if (fullness != ZS_EMPTY)
goto out;
- }
- migrate_read_unlock(zspage);
- /* If zspage is isolated, zs_page_putback will free the zspage */
free_zspage(pool, class, zspage);
out:
-
spin_unlock(&class->lock);
- unpin_tag(handle);
cache_free_handle(pool, handle);
}
EXPORT_SYMBOL_GPL(zs_free);
@@ -1608,11 +1598,8 @@ static unsigned long find_alloced_obj(st
offset += class->size * index;
while (offset < PAGE_SIZE) {
- if (obj_allocated(page, addr + offset, &handle)) {
- if (trypin_tag(handle))
- break;
- handle = 0;
- }
+ if (obj_allocated(page, addr + offset, &handle))
+ break;
offset += class->size;
index++;
@@ -1658,7 +1645,6 @@ static int migrate_zspage(struct zs_pool
/* Stop if there is no more space */
if (zspage_full(class, get_zspage(d_page))) {
- unpin_tag(handle);
ret = -ENOMEM;
break;
}
@@ -1667,15 +1653,7 @@ static int migrate_zspage(struct zs_pool
free_obj = obj_malloc(pool, get_zspage(d_page), handle);
zs_object_copy(class, free_obj, used_obj);
obj_idx++;
- /*
- * record_obj updates handle's value to free_obj and it will
- * invalidate lock bit(ie, HANDLE_PIN_BIT) of handle, which
- * breaks synchronization using pin_tag(e,g, zs_free) so
- * let's keep the lock bit.
- */
- free_obj |= BIT(HANDLE_PIN_BIT);
record_obj(handle, free_obj);
- unpin_tag(handle);
obj_free(class->size, used_obj);
}
@@ -1789,6 +1767,11 @@ static void migrate_write_lock(struct zs
write_lock(&zspage->lock);
}
+static void migrate_write_lock_nested(struct zspage *zspage)
+{
+ write_lock_nested(&zspage->lock, SINGLE_DEPTH_NESTING);
+}
+
static void migrate_write_unlock(struct zspage *zspage)
{
write_unlock(&zspage->lock);
@@ -1856,11 +1839,10 @@ static int zs_page_migrate(struct addres
struct zspage *zspage;
struct page *dummy;
void *s_addr, *d_addr, *addr;
- int offset, pos;
+ int offset;
unsigned long handle;
unsigned long old_obj, new_obj;
unsigned int obj_idx;
- int ret = -EAGAIN;
/*
* We cannot support the _NO_COPY case here, because copy needs to
@@ -1873,32 +1855,25 @@ static int zs_page_migrate(struct addres
VM_BUG_ON_PAGE(!PageMovable(page), page);
VM_BUG_ON_PAGE(!PageIsolated(page), page);
- zspage = get_zspage(page);
-
- /* Concurrent compactor cannot migrate any subpage in zspage */
- migrate_write_lock(zspage);
pool = mapping->private_data;
+
+ /*
+ * The pool migrate_lock protects the race between zpage migration
+ * and zs_free.
+ */
+ write_lock(&pool->migrate_lock);
+ zspage = get_zspage(page);
class = zspage_class(pool, zspage);
- offset = get_first_obj_offset(page);
+ /*
+ * the class lock protects zpage alloc/free in the zspage.
+ */
spin_lock(&class->lock);
- if (!get_zspage_inuse(zspage)) {
- /*
- * Set "offset" to end of the page so that every loops
- * skips unnecessary object scanning.
- */
- offset = PAGE_SIZE;
- }
+ /* the migrate_write_lock protects zpage access via zs_map_object */
+ migrate_write_lock(zspage);
- pos = offset;
+ offset = get_first_obj_offset(page);
s_addr = kmap_atomic(page);
- while (pos < PAGE_SIZE) {
- if (obj_allocated(page, s_addr + pos, &handle)) {
- if (!trypin_tag(handle))
- goto unpin_objects;
- }
- pos += class->size;
- }
/*
* Here, any user cannot access all objects in the zspage so let's move.
@@ -1907,25 +1882,30 @@ static int zs_page_migrate(struct addres
memcpy(d_addr, s_addr, PAGE_SIZE);
kunmap_atomic(d_addr);
- for (addr = s_addr + offset; addr < s_addr + pos;
+ for (addr = s_addr + offset; addr < s_addr + PAGE_SIZE;
addr += class->size) {
if (obj_allocated(page, addr, &handle)) {
- BUG_ON(!testpin_tag(handle));
old_obj = handle_to_obj(handle);
obj_to_location(old_obj, &dummy, &obj_idx);
new_obj = (unsigned long)location_to_obj(newpage,
obj_idx);
- new_obj |= BIT(HANDLE_PIN_BIT);
record_obj(handle, new_obj);
}
}
+ kunmap_atomic(s_addr);
replace_sub_page(class, zspage, newpage, page);
- get_page(newpage);
-
+ /*
+ * Since we complete the data copy and set up new zspage structure,
+ * it's okay to release migration_lock.
+ */
+ write_unlock(&pool->migrate_lock);
+ spin_unlock(&class->lock);
dec_zspage_isolation(zspage);
+ migrate_write_unlock(zspage);
+ get_page(newpage);
if (page_zone(newpage) != page_zone(page)) {
dec_zone_page_state(page, NR_ZSPAGES);
inc_zone_page_state(newpage, NR_ZSPAGES);
@@ -1933,22 +1913,8 @@ static int zs_page_migrate(struct addres
reset_page(page);
put_page(page);
- page = newpage;
-
- ret = MIGRATEPAGE_SUCCESS;
-unpin_objects:
- for (addr = s_addr + offset; addr < s_addr + pos;
- addr += class->size) {
- if (obj_allocated(page, addr, &handle)) {
- BUG_ON(!testpin_tag(handle));
- unpin_tag(handle);
- }
- }
- kunmap_atomic(s_addr);
- spin_unlock(&class->lock);
- migrate_write_unlock(zspage);
- return ret;
+ return MIGRATEPAGE_SUCCESS;
}
static void zs_page_putback(struct page *page)
@@ -2077,8 +2043,13 @@ static unsigned long __zs_compact(struct
struct zspage *dst_zspage = NULL;
unsigned long pages_freed = 0;
+ /* protect the race between zpage migration and zs_free */
+ write_lock(&pool->migrate_lock);
+ /* protect zpage allocation/free */
spin_lock(&class->lock);
while ((src_zspage = isolate_zspage(class, true))) {
+ /* protect someone accessing the zspage(i.e., zs_map_object) */
+ migrate_write_lock(src_zspage);
if (!zs_can_compact(class))
break;
@@ -2087,6 +2058,8 @@ static unsigned long __zs_compact(struct
cc.s_page = get_first_page(src_zspage);
while ((dst_zspage = isolate_zspage(class, false))) {
+ migrate_write_lock_nested(dst_zspage);
+
cc.d_page = get_first_page(dst_zspage);
/*
* If there is no more space in dst_page, resched
@@ -2096,6 +2069,10 @@ static unsigned long __zs_compact(struct
break;
putback_zspage(class, dst_zspage);
+ migrate_write_unlock(dst_zspage);
+ dst_zspage = NULL;
+ if (rwlock_is_contended(&pool->migrate_lock))
+ break;
}
/* Stop if we couldn't find slot */
@@ -2103,19 +2080,28 @@ static unsigned long __zs_compact(struct
break;
putback_zspage(class, dst_zspage);
+ migrate_write_unlock(dst_zspage);
+
if (putback_zspage(class, src_zspage) == ZS_EMPTY) {
+ migrate_write_unlock(src_zspage);
free_zspage(pool, class, src_zspage);
pages_freed += class->pages_per_zspage;
- }
+ } else
+ migrate_write_unlock(src_zspage);
spin_unlock(&class->lock);
+ write_unlock(&pool->migrate_lock);
cond_resched();
+ write_lock(&pool->migrate_lock);
spin_lock(&class->lock);
}
- if (src_zspage)
+ if (src_zspage) {
putback_zspage(class, src_zspage);
+ migrate_write_unlock(src_zspage);
+ }
spin_unlock(&class->lock);
+ write_unlock(&pool->migrate_lock);
return pages_freed;
}
@@ -2221,6 +2207,7 @@ struct zs_pool *zs_create_pool(const cha
return NULL;
init_deferred_free(pool);
+ rwlock_init(&pool->migrate_lock);
pool->name = kstrdup(name, GFP_KERNEL);
if (!pool->name)
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 52/69] zsmalloc: replace get_cpu_var with local_lock
2022-01-22 6:10 incoming Andrew Morton
` (50 preceding siblings ...)
2022-01-22 6:14 ` [patch 51/69] zsmalloc: replace per zpage lock with pool->migrate_lock Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:14 ` [patch 53/69] fs: proc: store PDE()->data into inode->i_private Andrew Morton
` (16 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: akpm, bigeasy, linux-mm, minchan, mm-commits, peterz,
senozhatsky, tglx, torvalds, umgwanakikbuti
From: Mike Galbraith <umgwanakikbuti@gmail.com>
Subject: zsmalloc: replace get_cpu_var with local_lock
The usage of get_cpu_var() in zs_map_object() is problematic because it
disables preemption and makes it impossible to acquire any sleeping lock
on PREEMPT_RT such as a spinlock_t.
Replace the get_cpu_var() usage with a local_lock_t which is embedded
struct mapping_area. It ensures that the access the struct is
synchronized against all users on the same CPU.
[minchan: remove the bit_spin_lock part and change the title]
Link: https://lkml.kernel.org/r/20211115185909.3949505-10-minchan@kernel.org
Signed-off-by: Mike Galbraith <umgwanakikbuti@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Minchan Kim <minchan@kernel.org>
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/zsmalloc.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
--- a/mm/zsmalloc.c~zsmalloc-replace-get_cpu_var-with-local_lock
+++ a/mm/zsmalloc.c
@@ -65,6 +65,7 @@
#include <linux/wait.h>
#include <linux/pagemap.h>
#include <linux/fs.h>
+#include <linux/local_lock.h>
#define ZSPAGE_MAGIC 0x58
@@ -276,6 +277,7 @@ struct zspage {
};
struct mapping_area {
+ local_lock_t lock;
char *vm_buf; /* copy buffer for objects that span pages */
char *vm_addr; /* address of kmap_atomic()'ed pages */
enum zs_mapmode vm_mm; /* mapping mode */
@@ -451,7 +453,9 @@ MODULE_ALIAS("zpool-zsmalloc");
#endif /* CONFIG_ZPOOL */
/* per-cpu VM mapping areas for zspage accesses that cross page boundaries */
-static DEFINE_PER_CPU(struct mapping_area, zs_map_area);
+static DEFINE_PER_CPU(struct mapping_area, zs_map_area) = {
+ .lock = INIT_LOCAL_LOCK(lock),
+};
static __maybe_unused int is_first_page(struct page *page)
{
@@ -1269,7 +1273,8 @@ void *zs_map_object(struct zs_pool *pool
class = zspage_class(pool, zspage);
off = (class->size * obj_idx) & ~PAGE_MASK;
- area = &get_cpu_var(zs_map_area);
+ local_lock(&zs_map_area.lock);
+ area = this_cpu_ptr(&zs_map_area);
area->vm_mm = mm;
if (off + class->size <= PAGE_SIZE) {
/* this object is contained entirely within a page */
@@ -1320,7 +1325,7 @@ void zs_unmap_object(struct zs_pool *poo
__zs_unmap_object(area, pages, off, class->size);
}
- put_cpu_var(zs_map_area);
+ local_unlock(&zs_map_area.lock);
migrate_read_unlock(zspage);
}
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 53/69] fs: proc: store PDE()->data into inode->i_private
2022-01-22 6:10 incoming Andrew Morton
` (51 preceding siblings ...)
2022-01-22 6:14 ` [patch 52/69] zsmalloc: replace get_cpu_var with local_lock Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:14 ` [patch 54/69] proc: remove PDE_DATA() completely Andrew Morton
` (15 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: adobriyan, akpm, christian.brauner, gladkov.alexey, linux-mm,
mm-commits, songmuchun, torvalds
From: Muchun Song <songmuchun@bytedance.com>
Subject: fs: proc: store PDE()->data into inode->i_private
PDE_DATA(inode) is introduced to get user private data and hide the layout
of struct proc_dir_entry. The inode->i_private is used to do the same
thing as well. Save a copy of user private data to inode-> i_private when
proc inode is allocated. This means the user also can get their private
data by inode->i_private.
Introduce pde_data() to wrap inode->i_private so that we can remove
PDE_DATA() from fs/proc/generic.c and make PTE_DATE() as a wrapper of
pde_data(). It will be easier if we decide to remove PDE_DATE() in the
future.
Link: https://lkml.kernel.org/r/20211124081956.87711-1-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Alexey Gladkov <gladkov.alexey@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/proc/generic.c | 6 ------
fs/proc/inode.c | 1 +
fs/proc/internal.h | 5 -----
include/linux/proc_fs.h | 13 ++++++++++++-
4 files changed, 13 insertions(+), 12 deletions(-)
--- a/fs/proc/generic.c~fs-proc-store-pde-data-into-inode-i_private
+++ a/fs/proc/generic.c
@@ -791,12 +791,6 @@ void proc_remove(struct proc_dir_entry *
}
EXPORT_SYMBOL(proc_remove);
-void *PDE_DATA(const struct inode *inode)
-{
- return __PDE_DATA(inode);
-}
-EXPORT_SYMBOL(PDE_DATA);
-
/*
* Pull a user buffer into memory and pass it to the file's write handler if
* one is supplied. The ->write() method is permitted to modify the
--- a/fs/proc/inode.c~fs-proc-store-pde-data-into-inode-i_private
+++ a/fs/proc/inode.c
@@ -650,6 +650,7 @@ struct inode *proc_get_inode(struct supe
return NULL;
}
+ inode->i_private = de->data;
inode->i_ino = de->low_ino;
inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
PROC_I(inode)->pde = de;
--- a/fs/proc/internal.h~fs-proc-store-pde-data-into-inode-i_private
+++ a/fs/proc/internal.h
@@ -115,11 +115,6 @@ static inline struct proc_dir_entry *PDE
return PROC_I(inode)->pde;
}
-static inline void *__PDE_DATA(const struct inode *inode)
-{
- return PDE(inode)->data;
-}
-
static inline struct pid *proc_pid(const struct inode *inode)
{
return PROC_I(inode)->pid;
--- a/include/linux/proc_fs.h~fs-proc-store-pde-data-into-inode-i_private
+++ a/include/linux/proc_fs.h
@@ -110,7 +110,18 @@ extern struct proc_dir_entry *proc_creat
struct proc_dir_entry *proc_create(const char *name, umode_t mode, struct proc_dir_entry *parent, const struct proc_ops *proc_ops);
extern void proc_set_size(struct proc_dir_entry *, loff_t);
extern void proc_set_user(struct proc_dir_entry *, kuid_t, kgid_t);
-extern void *PDE_DATA(const struct inode *);
+
+/*
+ * Obtain the private data passed by user through proc_create_data() or
+ * related.
+ */
+static inline void *pde_data(const struct inode *inode)
+{
+ return inode->i_private;
+}
+
+#define PDE_DATA(i) pde_data(i)
+
extern void *proc_get_parent_data(const struct inode *);
extern void proc_remove(struct proc_dir_entry *);
extern void remove_proc_entry(const char *, struct proc_dir_entry *);
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 54/69] proc: remove PDE_DATA() completely
2022-01-22 6:10 incoming Andrew Morton
` (52 preceding siblings ...)
2022-01-22 6:14 ` [patch 53/69] fs: proc: store PDE()->data into inode->i_private Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:14 ` [patch 55/69] lib/stackdepot: allow optional init and stack_table allocation by kvmalloc() Andrew Morton
` (14 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: adobriyan, akpm, christian.brauner, gladkov.alexey, linux-mm,
mm-commits, songmuchun, torvalds
From: Muchun Song <songmuchun@bytedance.com>
Subject: proc: remove PDE_DATA() completely
Remove PDE_DATA() completely and replace it with pde_data().
[akpm@linux-foundation.org: fix naming clash in drivers/nubus/proc.c]
[akpm@linux-foundation.org: now fix it properly]
Link: https://lkml.kernel.org/r/20211124081956.87711-2-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Alexey Gladkov <gladkov.alexey@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
arch/alpha/kernel/srm_env.c | 4 -
arch/arm/kernel/atags_proc.c | 2
arch/ia64/kernel/salinfo.c | 10 +-
arch/powerpc/kernel/proc_powerpc.c | 4 -
arch/sh/mm/alignment.c | 2
arch/xtensa/platforms/iss/simdisk.c | 4 -
drivers/acpi/proc.c | 2
drivers/hwmon/dell-smm-hwmon.c | 4 -
drivers/net/bonding/bond_procfs.c | 8 +-
drivers/net/wireless/cisco/airo.c | 22 +++---
drivers/net/wireless/intersil/hostap/hostap_ap.c | 16 ++--
drivers/net/wireless/intersil/hostap/hostap_download.c | 2
drivers/net/wireless/intersil/hostap/hostap_proc.c | 24 +++---
drivers/net/wireless/ray_cs.c | 2
drivers/nubus/proc.c | 36 +++++-----
drivers/parisc/led.c | 4 -
drivers/pci/proc.c | 10 +-
drivers/platform/x86/thinkpad_acpi.c | 4 -
drivers/platform/x86/toshiba_acpi.c | 16 ++--
drivers/pnp/isapnp/proc.c | 2
drivers/pnp/pnpbios/proc.c | 4 -
drivers/scsi/scsi_proc.c | 4 -
drivers/usb/gadget/function/rndis.c | 4 -
drivers/zorro/proc.c | 2
fs/afs/proc.c | 6 -
fs/ext4/mballoc.c | 14 +--
fs/jbd2/journal.c | 2
fs/proc/proc_net.c | 8 +-
include/linux/proc_fs.h | 4 -
include/linux/seq_file.h | 2
ipc/util.c | 2
kernel/irq/proc.c | 8 +-
kernel/resource.c | 4 -
net/atm/proc.c | 4 -
net/bluetooth/af_bluetooth.c | 8 +-
net/can/bcm.c | 2
net/can/proc.c | 2
net/core/neighbour.c | 6 -
net/core/pktgen.c | 6 -
net/ipv4/netfilter/ipt_CLUSTERIP.c | 6 -
net/ipv4/raw.c | 8 +-
net/ipv4/tcp_ipv4.c | 2
net/ipv4/udp.c | 6 -
net/netfilter/x_tables.c | 10 +-
net/netfilter/xt_hashlimit.c | 18 ++---
net/netfilter/xt_recent.c | 4 -
net/sunrpc/auth_gss/svcauth_gss.c | 4 -
net/sunrpc/cache.c | 24 +++---
net/sunrpc/stats.c | 2
sound/core/info.c | 4 -
50 files changed, 178 insertions(+), 180 deletions(-)
--- a/arch/alpha/kernel/srm_env.c~proc-remove-pde_data-completely
+++ a/arch/alpha/kernel/srm_env.c
@@ -83,14 +83,14 @@ static int srm_env_proc_show(struct seq_
static int srm_env_proc_open(struct inode *inode, struct file *file)
{
- return single_open(file, srm_env_proc_show, PDE_DATA(inode));
+ return single_open(file, srm_env_proc_show, pde_data(inode));
}
static ssize_t srm_env_proc_write(struct file *file, const char __user *buffer,
size_t count, loff_t *pos)
{
int res;
- unsigned long id = (unsigned long)PDE_DATA(file_inode(file));
+ unsigned long id = (unsigned long)pde_data(file_inode(file));
char *buf = (char *) __get_free_page(GFP_USER);
unsigned long ret1, ret2;
--- a/arch/arm/kernel/atags_proc.c~proc-remove-pde_data-completely
+++ a/arch/arm/kernel/atags_proc.c
@@ -13,7 +13,7 @@ struct buffer {
static ssize_t atags_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
- struct buffer *b = PDE_DATA(file_inode(file));
+ struct buffer *b = pde_data(file_inode(file));
return simple_read_from_buffer(buf, count, ppos, b->data, b->size);
}
--- a/arch/ia64/kernel/salinfo.c~proc-remove-pde_data-completely
+++ a/arch/ia64/kernel/salinfo.c
@@ -282,7 +282,7 @@ salinfo_event_open(struct inode *inode,
static ssize_t
salinfo_event_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
{
- struct salinfo_data *data = PDE_DATA(file_inode(file));
+ struct salinfo_data *data = pde_data(file_inode(file));
char cmd[32];
size_t size;
int i, n, cpu = -1;
@@ -340,7 +340,7 @@ static const struct proc_ops salinfo_eve
static int
salinfo_log_open(struct inode *inode, struct file *file)
{
- struct salinfo_data *data = PDE_DATA(inode);
+ struct salinfo_data *data = pde_data(inode);
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
@@ -365,7 +365,7 @@ salinfo_log_open(struct inode *inode, st
static int
salinfo_log_release(struct inode *inode, struct file *file)
{
- struct salinfo_data *data = PDE_DATA(inode);
+ struct salinfo_data *data = pde_data(inode);
if (data->state == STATE_NO_DATA) {
vfree(data->log_buffer);
@@ -433,7 +433,7 @@ retry:
static ssize_t
salinfo_log_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
{
- struct salinfo_data *data = PDE_DATA(file_inode(file));
+ struct salinfo_data *data = pde_data(file_inode(file));
u8 *buf;
u64 bufsize;
@@ -494,7 +494,7 @@ salinfo_log_clear(struct salinfo_data *d
static ssize_t
salinfo_log_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
{
- struct salinfo_data *data = PDE_DATA(file_inode(file));
+ struct salinfo_data *data = pde_data(file_inode(file));
char cmd[32];
size_t size;
u32 offset;
--- a/arch/powerpc/kernel/proc_powerpc.c~proc-remove-pde_data-completely
+++ a/arch/powerpc/kernel/proc_powerpc.c
@@ -25,7 +25,7 @@ static ssize_t page_map_read( struct fil
loff_t *ppos)
{
return simple_read_from_buffer(buf, nbytes, ppos,
- PDE_DATA(file_inode(file)), PAGE_SIZE);
+ pde_data(file_inode(file)), PAGE_SIZE);
}
static int page_map_mmap( struct file *file, struct vm_area_struct *vma )
@@ -34,7 +34,7 @@ static int page_map_mmap( struct file *f
return -EINVAL;
remap_pfn_range(vma, vma->vm_start,
- __pa(PDE_DATA(file_inode(file))) >> PAGE_SHIFT,
+ __pa(pde_data(file_inode(file))) >> PAGE_SHIFT,
PAGE_SIZE, vma->vm_page_prot);
return 0;
}
--- a/arch/sh/mm/alignment.c~proc-remove-pde_data-completely
+++ a/arch/sh/mm/alignment.c
@@ -140,7 +140,7 @@ static int alignment_proc_open(struct in
static ssize_t alignment_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *pos)
{
- int *data = PDE_DATA(file_inode(file));
+ int *data = pde_data(file_inode(file));
char mode;
if (count > 0) {
--- a/arch/xtensa/platforms/iss/simdisk.c~proc-remove-pde_data-completely
+++ a/arch/xtensa/platforms/iss/simdisk.c
@@ -208,7 +208,7 @@ static int simdisk_detach(struct simdisk
static ssize_t proc_read_simdisk(struct file *file, char __user *buf,
size_t size, loff_t *ppos)
{
- struct simdisk *dev = PDE_DATA(file_inode(file));
+ struct simdisk *dev = pde_data(file_inode(file));
const char *s = dev->filename;
if (s) {
ssize_t n = simple_read_from_buffer(buf, size, ppos,
@@ -225,7 +225,7 @@ static ssize_t proc_write_simdisk(struct
size_t count, loff_t *ppos)
{
char *tmp = memdup_user_nul(buf, count);
- struct simdisk *dev = PDE_DATA(file_inode(file));
+ struct simdisk *dev = pde_data(file_inode(file));
int err;
if (IS_ERR(tmp))
--- a/drivers/acpi/proc.c~proc-remove-pde_data-completely
+++ a/drivers/acpi/proc.c
@@ -127,7 +127,7 @@ static int
acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_system_wakeup_device_seq_show,
- PDE_DATA(inode));
+ pde_data(inode));
}
static const struct proc_ops acpi_system_wakeup_device_proc_ops = {
--- a/drivers/hwmon/dell-smm-hwmon.c~proc-remove-pde_data-completely
+++ a/drivers/hwmon/dell-smm-hwmon.c
@@ -451,7 +451,7 @@ static int i8k_get_power_status(void)
static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
{
- struct dell_smm_data *data = PDE_DATA(file_inode(fp));
+ struct dell_smm_data *data = pde_data(file_inode(fp));
int __user *argp = (int __user *)arg;
int speed, err;
int val = 0;
@@ -585,7 +585,7 @@ static int i8k_proc_show(struct seq_file
static int i8k_open_fs(struct inode *inode, struct file *file)
{
- return single_open(file, i8k_proc_show, PDE_DATA(inode));
+ return single_open(file, i8k_proc_show, pde_data(inode));
}
static const struct proc_ops i8k_proc_ops = {
--- a/drivers/net/bonding/bond_procfs.c~proc-remove-pde_data-completely
+++ a/drivers/net/bonding/bond_procfs.c
@@ -11,7 +11,7 @@
static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(RCU)
{
- struct bonding *bond = PDE_DATA(file_inode(seq->file));
+ struct bonding *bond = pde_data(file_inode(seq->file));
struct list_head *iter;
struct slave *slave;
loff_t off = 0;
@@ -30,7 +30,7 @@ static void *bond_info_seq_start(struct
static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
- struct bonding *bond = PDE_DATA(file_inode(seq->file));
+ struct bonding *bond = pde_data(file_inode(seq->file));
struct list_head *iter;
struct slave *slave;
bool found = false;
@@ -57,7 +57,7 @@ static void bond_info_seq_stop(struct se
static void bond_info_show_master(struct seq_file *seq)
{
- struct bonding *bond = PDE_DATA(file_inode(seq->file));
+ struct bonding *bond = pde_data(file_inode(seq->file));
const struct bond_opt_value *optval;
struct slave *curr, *primary;
int i;
@@ -175,7 +175,7 @@ static void bond_info_show_master(struct
static void bond_info_show_slave(struct seq_file *seq,
const struct slave *slave)
{
- struct bonding *bond = PDE_DATA(file_inode(seq->file));
+ struct bonding *bond = pde_data(file_inode(seq->file));
seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
seq_printf(seq, "MII Status: %s\n", bond_slave_link_status(slave->link));
--- a/drivers/net/wireless/cisco/airo.c~proc-remove-pde_data-completely
+++ a/drivers/net/wireless/cisco/airo.c
@@ -4672,7 +4672,7 @@ static ssize_t proc_write(struct file *f
static int proc_status_open(struct inode *inode, struct file *file)
{
struct proc_data *data;
- struct net_device *dev = PDE_DATA(inode);
+ struct net_device *dev = pde_data(inode);
struct airo_info *apriv = dev->ml_priv;
CapabilityRid cap_rid;
StatusRid status_rid;
@@ -4756,7 +4756,7 @@ static int proc_stats_rid_open(struct in
u16 rid)
{
struct proc_data *data;
- struct net_device *dev = PDE_DATA(inode);
+ struct net_device *dev = pde_data(inode);
struct airo_info *apriv = dev->ml_priv;
StatsRid stats;
int i, j;
@@ -4819,7 +4819,7 @@ static inline int sniffing_mode(struct a
static void proc_config_on_close(struct inode *inode, struct file *file)
{
struct proc_data *data = file->private_data;
- struct net_device *dev = PDE_DATA(inode);
+ struct net_device *dev = pde_data(inode);
struct airo_info *ai = dev->ml_priv;
char *line;
@@ -5030,7 +5030,7 @@ static const char *get_rmode(__le16 mode
static int proc_config_open(struct inode *inode, struct file *file)
{
struct proc_data *data;
- struct net_device *dev = PDE_DATA(inode);
+ struct net_device *dev = pde_data(inode);
struct airo_info *ai = dev->ml_priv;
int i;
__le16 mode;
@@ -5120,7 +5120,7 @@ static int proc_config_open(struct inode
static void proc_SSID_on_close(struct inode *inode, struct file *file)
{
struct proc_data *data = file->private_data;
- struct net_device *dev = PDE_DATA(inode);
+ struct net_device *dev = pde_data(inode);
struct airo_info *ai = dev->ml_priv;
SsidRid SSID_rid;
int i;
@@ -5156,7 +5156,7 @@ static void proc_SSID_on_close(struct in
static void proc_APList_on_close(struct inode *inode, struct file *file)
{
struct proc_data *data = file->private_data;
- struct net_device *dev = PDE_DATA(inode);
+ struct net_device *dev = pde_data(inode);
struct airo_info *ai = dev->ml_priv;
APListRid *APList_rid = &ai->APList;
int i;
@@ -5280,7 +5280,7 @@ static int set_wep_tx_idx(struct airo_in
static void proc_wepkey_on_close(struct inode *inode, struct file *file)
{
struct proc_data *data;
- struct net_device *dev = PDE_DATA(inode);
+ struct net_device *dev = pde_data(inode);
struct airo_info *ai = dev->ml_priv;
int i, rc;
char key[16];
@@ -5331,7 +5331,7 @@ static void proc_wepkey_on_close(struct
static int proc_wepkey_open(struct inode *inode, struct file *file)
{
struct proc_data *data;
- struct net_device *dev = PDE_DATA(inode);
+ struct net_device *dev = pde_data(inode);
struct airo_info *ai = dev->ml_priv;
char *ptr;
WepKeyRid wkr;
@@ -5379,7 +5379,7 @@ static int proc_wepkey_open(struct inode
static int proc_SSID_open(struct inode *inode, struct file *file)
{
struct proc_data *data;
- struct net_device *dev = PDE_DATA(inode);
+ struct net_device *dev = pde_data(inode);
struct airo_info *ai = dev->ml_priv;
int i;
char *ptr;
@@ -5423,7 +5423,7 @@ static int proc_SSID_open(struct inode *
static int proc_APList_open(struct inode *inode, struct file *file)
{
struct proc_data *data;
- struct net_device *dev = PDE_DATA(inode);
+ struct net_device *dev = pde_data(inode);
struct airo_info *ai = dev->ml_priv;
int i;
char *ptr;
@@ -5462,7 +5462,7 @@ static int proc_APList_open(struct inode
static int proc_BSSList_open(struct inode *inode, struct file *file)
{
struct proc_data *data;
- struct net_device *dev = PDE_DATA(inode);
+ struct net_device *dev = pde_data(inode);
struct airo_info *ai = dev->ml_priv;
char *ptr;
BSSListRid BSSList_rid;
--- a/drivers/net/wireless/intersil/hostap/hostap_ap.c~proc-remove-pde_data-completely
+++ a/drivers/net/wireless/intersil/hostap/hostap_ap.c
@@ -69,7 +69,7 @@ static void prism2_send_mgmt(struct net_
#if !defined(PRISM2_NO_PROCFS_DEBUG) && defined(CONFIG_PROC_FS)
static int ap_debug_proc_show(struct seq_file *m, void *v)
{
- struct ap_data *ap = PDE_DATA(file_inode(m->file));
+ struct ap_data *ap = pde_data(file_inode(m->file));
seq_printf(m, "BridgedUnicastFrames=%u\n", ap->bridged_unicast);
seq_printf(m, "BridgedMulticastFrames=%u\n", ap->bridged_multicast);
@@ -320,7 +320,7 @@ void hostap_deauth_all_stas(struct net_d
static int ap_control_proc_show(struct seq_file *m, void *v)
{
- struct ap_data *ap = PDE_DATA(file_inode(m->file));
+ struct ap_data *ap = pde_data(file_inode(m->file));
char *policy_txt;
struct mac_entry *entry;
@@ -352,20 +352,20 @@ static int ap_control_proc_show(struct s
static void *ap_control_proc_start(struct seq_file *m, loff_t *_pos)
{
- struct ap_data *ap = PDE_DATA(file_inode(m->file));
+ struct ap_data *ap = pde_data(file_inode(m->file));
spin_lock_bh(&ap->mac_restrictions.lock);
return seq_list_start_head(&ap->mac_restrictions.mac_list, *_pos);
}
static void *ap_control_proc_next(struct seq_file *m, void *v, loff_t *_pos)
{
- struct ap_data *ap = PDE_DATA(file_inode(m->file));
+ struct ap_data *ap = pde_data(file_inode(m->file));
return seq_list_next(v, &ap->mac_restrictions.mac_list, _pos);
}
static void ap_control_proc_stop(struct seq_file *m, void *v)
{
- struct ap_data *ap = PDE_DATA(file_inode(m->file));
+ struct ap_data *ap = pde_data(file_inode(m->file));
spin_unlock_bh(&ap->mac_restrictions.lock);
}
@@ -554,20 +554,20 @@ static int prism2_ap_proc_show(struct se
static void *prism2_ap_proc_start(struct seq_file *m, loff_t *_pos)
{
- struct ap_data *ap = PDE_DATA(file_inode(m->file));
+ struct ap_data *ap = pde_data(file_inode(m->file));
spin_lock_bh(&ap->sta_table_lock);
return seq_list_start_head(&ap->sta_list, *_pos);
}
static void *prism2_ap_proc_next(struct seq_file *m, void *v, loff_t *_pos)
{
- struct ap_data *ap = PDE_DATA(file_inode(m->file));
+ struct ap_data *ap = pde_data(file_inode(m->file));
return seq_list_next(v, &ap->sta_list, _pos);
}
static void prism2_ap_proc_stop(struct seq_file *m, void *v)
{
- struct ap_data *ap = PDE_DATA(file_inode(m->file));
+ struct ap_data *ap = pde_data(file_inode(m->file));
spin_unlock_bh(&ap->sta_table_lock);
}
--- a/drivers/net/wireless/intersil/hostap/hostap_download.c~proc-remove-pde_data-completely
+++ a/drivers/net/wireless/intersil/hostap/hostap_download.c
@@ -227,7 +227,7 @@ static int prism2_download_aux_dump_proc
sizeof(struct prism2_download_aux_dump));
if (ret == 0) {
struct seq_file *m = file->private_data;
- m->private = PDE_DATA(inode);
+ m->private = pde_data(inode);
}
return ret;
}
--- a/drivers/net/wireless/intersil/hostap/hostap_proc.c~proc-remove-pde_data-completely
+++ a/drivers/net/wireless/intersil/hostap/hostap_proc.c
@@ -97,20 +97,20 @@ static int prism2_wds_proc_show(struct s
static void *prism2_wds_proc_start(struct seq_file *m, loff_t *_pos)
{
- local_info_t *local = PDE_DATA(file_inode(m->file));
+ local_info_t *local = pde_data(file_inode(m->file));
read_lock_bh(&local->iface_lock);
return seq_list_start(&local->hostap_interfaces, *_pos);
}
static void *prism2_wds_proc_next(struct seq_file *m, void *v, loff_t *_pos)
{
- local_info_t *local = PDE_DATA(file_inode(m->file));
+ local_info_t *local = pde_data(file_inode(m->file));
return seq_list_next(v, &local->hostap_interfaces, _pos);
}
static void prism2_wds_proc_stop(struct seq_file *m, void *v)
{
- local_info_t *local = PDE_DATA(file_inode(m->file));
+ local_info_t *local = pde_data(file_inode(m->file));
read_unlock_bh(&local->iface_lock);
}
@@ -123,7 +123,7 @@ static const struct seq_operations prism
static int prism2_bss_list_proc_show(struct seq_file *m, void *v)
{
- local_info_t *local = PDE_DATA(file_inode(m->file));
+ local_info_t *local = pde_data(file_inode(m->file));
struct list_head *ptr = v;
struct hostap_bss_info *bss;
@@ -151,21 +151,21 @@ static int prism2_bss_list_proc_show(str
static void *prism2_bss_list_proc_start(struct seq_file *m, loff_t *_pos)
__acquires(&local->lock)
{
- local_info_t *local = PDE_DATA(file_inode(m->file));
+ local_info_t *local = pde_data(file_inode(m->file));
spin_lock_bh(&local->lock);
return seq_list_start_head(&local->bss_list, *_pos);
}
static void *prism2_bss_list_proc_next(struct seq_file *m, void *v, loff_t *_pos)
{
- local_info_t *local = PDE_DATA(file_inode(m->file));
+ local_info_t *local = pde_data(file_inode(m->file));
return seq_list_next(v, &local->bss_list, _pos);
}
static void prism2_bss_list_proc_stop(struct seq_file *m, void *v)
__releases(&local->lock)
{
- local_info_t *local = PDE_DATA(file_inode(m->file));
+ local_info_t *local = pde_data(file_inode(m->file));
spin_unlock_bh(&local->lock);
}
@@ -198,7 +198,7 @@ static int prism2_crypt_proc_show(struct
static ssize_t prism2_pda_proc_read(struct file *file, char __user *buf,
size_t count, loff_t *_pos)
{
- local_info_t *local = PDE_DATA(file_inode(file));
+ local_info_t *local = pde_data(file_inode(file));
size_t off;
if (local->pda == NULL || *_pos >= PRISM2_PDA_SIZE)
@@ -272,7 +272,7 @@ static int prism2_io_debug_proc_read(cha
#ifndef PRISM2_NO_STATION_MODES
static int prism2_scan_results_proc_show(struct seq_file *m, void *v)
{
- local_info_t *local = PDE_DATA(file_inode(m->file));
+ local_info_t *local = pde_data(file_inode(m->file));
unsigned long entry;
int i, len;
struct hfa384x_hostscan_result *scanres;
@@ -322,7 +322,7 @@ static int prism2_scan_results_proc_show
static void *prism2_scan_results_proc_start(struct seq_file *m, loff_t *_pos)
{
- local_info_t *local = PDE_DATA(file_inode(m->file));
+ local_info_t *local = pde_data(file_inode(m->file));
spin_lock_bh(&local->lock);
/* We have a header (pos 0) + N results to show (pos 1...N) */
@@ -333,7 +333,7 @@ static void *prism2_scan_results_proc_st
static void *prism2_scan_results_proc_next(struct seq_file *m, void *v, loff_t *_pos)
{
- local_info_t *local = PDE_DATA(file_inode(m->file));
+ local_info_t *local = pde_data(file_inode(m->file));
++*_pos;
if (*_pos > local->last_scan_results_count)
@@ -343,7 +343,7 @@ static void *prism2_scan_results_proc_ne
static void prism2_scan_results_proc_stop(struct seq_file *m, void *v)
{
- local_info_t *local = PDE_DATA(file_inode(m->file));
+ local_info_t *local = pde_data(file_inode(m->file));
spin_unlock_bh(&local->lock);
}
--- a/drivers/net/wireless/ray_cs.c~proc-remove-pde_data-completely
+++ a/drivers/net/wireless/ray_cs.c
@@ -2746,7 +2746,7 @@ static ssize_t int_proc_write(struct fil
nr = nr * 10 + c;
p++;
} while (--len);
- *(int *)PDE_DATA(file_inode(file)) = nr;
+ *(int *)pde_data(file_inode(file)) = nr;
return count;
}
--- a/drivers/nubus/proc.c~proc-remove-pde_data-completely
+++ a/drivers/nubus/proc.c
@@ -93,30 +93,30 @@ struct nubus_proc_pde_data {
static struct nubus_proc_pde_data *
nubus_proc_alloc_pde_data(unsigned char *ptr, unsigned int size)
{
- struct nubus_proc_pde_data *pde_data;
+ struct nubus_proc_pde_data *pded;
- pde_data = kmalloc(sizeof(*pde_data), GFP_KERNEL);
- if (!pde_data)
+ pded = kmalloc(sizeof(*pded), GFP_KERNEL);
+ if (!pded)
return NULL;
- pde_data->res_ptr = ptr;
- pde_data->res_size = size;
- return pde_data;
+ pded->res_ptr = ptr;
+ pded->res_size = size;
+ return pded;
}
static int nubus_proc_rsrc_show(struct seq_file *m, void *v)
{
struct inode *inode = m->private;
- struct nubus_proc_pde_data *pde_data;
+ struct nubus_proc_pde_data *pded;
- pde_data = PDE_DATA(inode);
- if (!pde_data)
+ pded = pde_data(inode);
+ if (!pded)
return 0;
- if (pde_data->res_size > m->size)
+ if (pded->res_size > m->size)
return -EFBIG;
- if (pde_data->res_size) {
+ if (pded->res_size) {
int lanes = (int)proc_get_parent_data(inode);
struct nubus_dirent ent;
@@ -124,11 +124,11 @@ static int nubus_proc_rsrc_show(struct s
return 0;
ent.mask = lanes;
- ent.base = pde_data->res_ptr;
+ ent.base = pded->res_ptr;
ent.data = 0;
- nubus_seq_write_rsrc_mem(m, &ent, pde_data->res_size);
+ nubus_seq_write_rsrc_mem(m, &ent, pded->res_size);
} else {
- unsigned int data = (unsigned int)pde_data->res_ptr;
+ unsigned int data = (unsigned int)pded->res_ptr;
seq_putc(m, data >> 16);
seq_putc(m, data >> 8);
@@ -142,18 +142,18 @@ void nubus_proc_add_rsrc_mem(struct proc
unsigned int size)
{
char name[9];
- struct nubus_proc_pde_data *pde_data;
+ struct nubus_proc_pde_data *pded;
if (!procdir)
return;
snprintf(name, sizeof(name), "%x", ent->type);
if (size)
- pde_data = nubus_proc_alloc_pde_data(nubus_dirptr(ent), size);
+ pded = nubus_proc_alloc_pde_data(nubus_dirptr(ent), size);
else
- pde_data = NULL;
+ pded = NULL;
proc_create_single_data(name, S_IFREG | 0444, procdir,
- nubus_proc_rsrc_show, pde_data);
+ nubus_proc_rsrc_show, pded);
}
void nubus_proc_add_rsrc(struct proc_dir_entry *procdir,
--- a/drivers/parisc/led.c~proc-remove-pde_data-completely
+++ a/drivers/parisc/led.c
@@ -168,14 +168,14 @@ static int led_proc_show(struct seq_file
static int led_proc_open(struct inode *inode, struct file *file)
{
- return single_open(file, led_proc_show, PDE_DATA(inode));
+ return single_open(file, led_proc_show, pde_data(inode));
}
static ssize_t led_proc_write(struct file *file, const char __user *buf,
size_t count, loff_t *pos)
{
- void *data = PDE_DATA(file_inode(file));
+ void *data = pde_data(file_inode(file));
char *cur, lbuf[32];
int d;
--- a/drivers/pci/proc.c~proc-remove-pde_data-completely
+++ a/drivers/pci/proc.c
@@ -21,14 +21,14 @@ static int proc_initialized; /* = 0 */
static loff_t proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
{
- struct pci_dev *dev = PDE_DATA(file_inode(file));
+ struct pci_dev *dev = pde_data(file_inode(file));
return fixed_size_llseek(file, off, whence, dev->cfg_size);
}
static ssize_t proc_bus_pci_read(struct file *file, char __user *buf,
size_t nbytes, loff_t *ppos)
{
- struct pci_dev *dev = PDE_DATA(file_inode(file));
+ struct pci_dev *dev = pde_data(file_inode(file));
unsigned int pos = *ppos;
unsigned int cnt, size;
@@ -114,7 +114,7 @@ static ssize_t proc_bus_pci_write(struct
size_t nbytes, loff_t *ppos)
{
struct inode *ino = file_inode(file);
- struct pci_dev *dev = PDE_DATA(ino);
+ struct pci_dev *dev = pde_data(ino);
int pos = *ppos;
int size = dev->cfg_size;
int cnt, ret;
@@ -196,7 +196,7 @@ struct pci_filp_private {
static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
- struct pci_dev *dev = PDE_DATA(file_inode(file));
+ struct pci_dev *dev = pde_data(file_inode(file));
#ifdef HAVE_PCI_MMAP
struct pci_filp_private *fpriv = file->private_data;
#endif /* HAVE_PCI_MMAP */
@@ -244,7 +244,7 @@ static long proc_bus_pci_ioctl(struct fi
#ifdef HAVE_PCI_MMAP
static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
{
- struct pci_dev *dev = PDE_DATA(file_inode(file));
+ struct pci_dev *dev = pde_data(file_inode(file));
struct pci_filp_private *fpriv = file->private_data;
int i, ret, write_combine = 0, res_bit = IORESOURCE_MEM;
--- a/drivers/platform/x86/thinkpad_acpi.c~proc-remove-pde_data-completely
+++ a/drivers/platform/x86/thinkpad_acpi.c
@@ -880,14 +880,14 @@ static int dispatch_proc_show(struct seq
static int dispatch_proc_open(struct inode *inode, struct file *file)
{
- return single_open(file, dispatch_proc_show, PDE_DATA(inode));
+ return single_open(file, dispatch_proc_show, pde_data(inode));
}
static ssize_t dispatch_proc_write(struct file *file,
const char __user *userbuf,
size_t count, loff_t *pos)
{
- struct ibm_struct *ibm = PDE_DATA(file_inode(file));
+ struct ibm_struct *ibm = pde_data(file_inode(file));
char *kernbuf;
int ret;
--- a/drivers/platform/x86/toshiba_acpi.c~proc-remove-pde_data-completely
+++ a/drivers/platform/x86/toshiba_acpi.c
@@ -1368,7 +1368,7 @@ static int lcd_proc_show(struct seq_file
static int lcd_proc_open(struct inode *inode, struct file *file)
{
- return single_open(file, lcd_proc_show, PDE_DATA(inode));
+ return single_open(file, lcd_proc_show, pde_data(inode));
}
static int set_lcd_brightness(struct toshiba_acpi_dev *dev, int value)
@@ -1404,7 +1404,7 @@ static int set_lcd_status(struct backlig
static ssize_t lcd_proc_write(struct file *file, const char __user *buf,
size_t count, loff_t *pos)
{
- struct toshiba_acpi_dev *dev = PDE_DATA(file_inode(file));
+ struct toshiba_acpi_dev *dev = pde_data(file_inode(file));
char cmd[42];
size_t len;
int levels;
@@ -1469,13 +1469,13 @@ static int video_proc_show(struct seq_fi
static int video_proc_open(struct inode *inode, struct file *file)
{
- return single_open(file, video_proc_show, PDE_DATA(inode));
+ return single_open(file, video_proc_show, pde_data(inode));
}
static ssize_t video_proc_write(struct file *file, const char __user *buf,
size_t count, loff_t *pos)
{
- struct toshiba_acpi_dev *dev = PDE_DATA(file_inode(file));
+ struct toshiba_acpi_dev *dev = pde_data(file_inode(file));
char *buffer;
char *cmd;
int lcd_out = -1, crt_out = -1, tv_out = -1;
@@ -1580,13 +1580,13 @@ static int fan_proc_show(struct seq_file
static int fan_proc_open(struct inode *inode, struct file *file)
{
- return single_open(file, fan_proc_show, PDE_DATA(inode));
+ return single_open(file, fan_proc_show, pde_data(inode));
}
static ssize_t fan_proc_write(struct file *file, const char __user *buf,
size_t count, loff_t *pos)
{
- struct toshiba_acpi_dev *dev = PDE_DATA(file_inode(file));
+ struct toshiba_acpi_dev *dev = pde_data(file_inode(file));
char cmd[42];
size_t len;
int value;
@@ -1628,13 +1628,13 @@ static int keys_proc_show(struct seq_fil
static int keys_proc_open(struct inode *inode, struct file *file)
{
- return single_open(file, keys_proc_show, PDE_DATA(inode));
+ return single_open(file, keys_proc_show, pde_data(inode));
}
static ssize_t keys_proc_write(struct file *file, const char __user *buf,
size_t count, loff_t *pos)
{
- struct toshiba_acpi_dev *dev = PDE_DATA(file_inode(file));
+ struct toshiba_acpi_dev *dev = pde_data(file_inode(file));
char cmd[42];
size_t len;
int value;
--- a/drivers/pnp/isapnp/proc.c~proc-remove-pde_data-completely
+++ a/drivers/pnp/isapnp/proc.c
@@ -22,7 +22,7 @@ static loff_t isapnp_proc_bus_lseek(stru
static ssize_t isapnp_proc_bus_read(struct file *file, char __user * buf,
size_t nbytes, loff_t * ppos)
{
- struct pnp_dev *dev = PDE_DATA(file_inode(file));
+ struct pnp_dev *dev = pde_data(file_inode(file));
int pos = *ppos;
int cnt, size = 256;
--- a/drivers/pnp/pnpbios/proc.c~proc-remove-pde_data-completely
+++ a/drivers/pnp/pnpbios/proc.c
@@ -173,13 +173,13 @@ static int pnpbios_proc_show(struct seq_
static int pnpbios_proc_open(struct inode *inode, struct file *file)
{
- return single_open(file, pnpbios_proc_show, PDE_DATA(inode));
+ return single_open(file, pnpbios_proc_show, pde_data(inode));
}
static ssize_t pnpbios_proc_write(struct file *file, const char __user *buf,
size_t count, loff_t *pos)
{
- void *data = PDE_DATA(file_inode(file));
+ void *data = pde_data(file_inode(file));
struct pnp_bios_node *node;
int boot = (long)data >> 8;
u8 nodenum = (long)data;
--- a/drivers/scsi/scsi_proc.c~proc-remove-pde_data-completely
+++ a/drivers/scsi/scsi_proc.c
@@ -49,7 +49,7 @@ static DEFINE_MUTEX(global_host_template
static ssize_t proc_scsi_host_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
- struct Scsi_Host *shost = PDE_DATA(file_inode(file));
+ struct Scsi_Host *shost = pde_data(file_inode(file));
ssize_t ret = -ENOMEM;
char *page;
@@ -79,7 +79,7 @@ static int proc_scsi_show(struct seq_fil
static int proc_scsi_host_open(struct inode *inode, struct file *file)
{
- return single_open_size(file, proc_scsi_show, PDE_DATA(inode),
+ return single_open_size(file, proc_scsi_show, pde_data(inode),
4 * PAGE_SIZE);
}
--- a/drivers/usb/gadget/function/rndis.c~proc-remove-pde_data-completely
+++ a/drivers/usb/gadget/function/rndis.c
@@ -1117,7 +1117,7 @@ static int rndis_proc_show(struct seq_fi
static ssize_t rndis_proc_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos)
{
- rndis_params *p = PDE_DATA(file_inode(file));
+ rndis_params *p = pde_data(file_inode(file));
u32 speed = 0;
int i, fl_speed = 0;
@@ -1161,7 +1161,7 @@ static ssize_t rndis_proc_write(struct f
static int rndis_proc_open(struct inode *inode, struct file *file)
{
- return single_open(file, rndis_proc_show, PDE_DATA(inode));
+ return single_open(file, rndis_proc_show, pde_data(inode));
}
static const struct proc_ops rndis_proc_ops = {
--- a/drivers/zorro/proc.c~proc-remove-pde_data-completely
+++ a/drivers/zorro/proc.c
@@ -30,7 +30,7 @@ proc_bus_zorro_lseek(struct file *file,
static ssize_t
proc_bus_zorro_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
{
- struct zorro_dev *z = PDE_DATA(file_inode(file));
+ struct zorro_dev *z = pde_data(file_inode(file));
struct ConfigDev cd;
loff_t pos = *ppos;
--- a/fs/afs/proc.c~proc-remove-pde_data-completely
+++ a/fs/afs/proc.c
@@ -227,7 +227,7 @@ static int afs_proc_cell_volumes_show(st
static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
__acquires(cell->proc_lock)
{
- struct afs_cell *cell = PDE_DATA(file_inode(m->file));
+ struct afs_cell *cell = pde_data(file_inode(m->file));
rcu_read_lock();
return seq_hlist_start_head_rcu(&cell->proc_volumes, *_pos);
@@ -236,7 +236,7 @@ static void *afs_proc_cell_volumes_start
static void *afs_proc_cell_volumes_next(struct seq_file *m, void *v,
loff_t *_pos)
{
- struct afs_cell *cell = PDE_DATA(file_inode(m->file));
+ struct afs_cell *cell = pde_data(file_inode(m->file));
return seq_hlist_next_rcu(v, &cell->proc_volumes, _pos);
}
@@ -322,7 +322,7 @@ static void *afs_proc_cell_vlservers_sta
{
struct afs_vl_seq_net_private *priv = m->private;
struct afs_vlserver_list *vllist;
- struct afs_cell *cell = PDE_DATA(file_inode(m->file));
+ struct afs_cell *cell = pde_data(file_inode(m->file));
loff_t pos = *_pos;
rcu_read_lock();
--- a/fs/ext4/mballoc.c~proc-remove-pde_data-completely
+++ a/fs/ext4/mballoc.c
@@ -2834,7 +2834,7 @@ out:
static void *ext4_mb_seq_groups_start(struct seq_file *seq, loff_t *pos)
{
- struct super_block *sb = PDE_DATA(file_inode(seq->file));
+ struct super_block *sb = pde_data(file_inode(seq->file));
ext4_group_t group;
if (*pos < 0 || *pos >= ext4_get_groups_count(sb))
@@ -2845,7 +2845,7 @@ static void *ext4_mb_seq_groups_start(st
static void *ext4_mb_seq_groups_next(struct seq_file *seq, void *v, loff_t *pos)
{
- struct super_block *sb = PDE_DATA(file_inode(seq->file));
+ struct super_block *sb = pde_data(file_inode(seq->file));
ext4_group_t group;
++*pos;
@@ -2857,7 +2857,7 @@ static void *ext4_mb_seq_groups_next(str
static int ext4_mb_seq_groups_show(struct seq_file *seq, void *v)
{
- struct super_block *sb = PDE_DATA(file_inode(seq->file));
+ struct super_block *sb = pde_data(file_inode(seq->file));
ext4_group_t group = (ext4_group_t) ((unsigned long) v);
int i;
int err, buddy_loaded = 0;
@@ -2985,7 +2985,7 @@ int ext4_seq_mb_stats_show(struct seq_fi
static void *ext4_mb_seq_structs_summary_start(struct seq_file *seq, loff_t *pos)
__acquires(&EXT4_SB(sb)->s_mb_rb_lock)
{
- struct super_block *sb = PDE_DATA(file_inode(seq->file));
+ struct super_block *sb = pde_data(file_inode(seq->file));
unsigned long position;
read_lock(&EXT4_SB(sb)->s_mb_rb_lock);
@@ -2998,7 +2998,7 @@ __acquires(&EXT4_SB(sb)->s_mb_rb_lock)
static void *ext4_mb_seq_structs_summary_next(struct seq_file *seq, void *v, loff_t *pos)
{
- struct super_block *sb = PDE_DATA(file_inode(seq->file));
+ struct super_block *sb = pde_data(file_inode(seq->file));
unsigned long position;
++*pos;
@@ -3010,7 +3010,7 @@ static void *ext4_mb_seq_structs_summary
static int ext4_mb_seq_structs_summary_show(struct seq_file *seq, void *v)
{
- struct super_block *sb = PDE_DATA(file_inode(seq->file));
+ struct super_block *sb = pde_data(file_inode(seq->file));
struct ext4_sb_info *sbi = EXT4_SB(sb);
unsigned long position = ((unsigned long) v);
struct ext4_group_info *grp;
@@ -3058,7 +3058,7 @@ static int ext4_mb_seq_structs_summary_s
static void ext4_mb_seq_structs_summary_stop(struct seq_file *seq, void *v)
__releases(&EXT4_SB(sb)->s_mb_rb_lock)
{
- struct super_block *sb = PDE_DATA(file_inode(seq->file));
+ struct super_block *sb = pde_data(file_inode(seq->file));
read_unlock(&EXT4_SB(sb)->s_mb_rb_lock);
}
--- a/fs/jbd2/journal.c~proc-remove-pde_data-completely
+++ a/fs/jbd2/journal.c
@@ -1212,7 +1212,7 @@ static const struct seq_operations jbd2_
static int jbd2_seq_info_open(struct inode *inode, struct file *file)
{
- journal_t *journal = PDE_DATA(inode);
+ journal_t *journal = pde_data(inode);
struct jbd2_stats_proc_session *s;
int rc, size;
--- a/fs/proc/proc_net.c~proc-remove-pde_data-completely
+++ a/fs/proc/proc_net.c
@@ -138,7 +138,7 @@ EXPORT_SYMBOL_GPL(proc_create_net_data);
* @parent: The parent directory in which to create.
* @ops: The seq_file ops with which to read the file.
* @write: The write method with which to 'modify' the file.
- * @data: Data for retrieval by PDE_DATA().
+ * @data: Data for retrieval by pde_data().
*
* Create a network namespaced proc file in the @parent directory with the
* specified @name and @mode that allows reading of a file that displays a
@@ -153,7 +153,7 @@ EXPORT_SYMBOL_GPL(proc_create_net_data);
* modified by the @write function. @write should return 0 on success.
*
* The @data value is accessible from the @show and @write functions by calling
- * PDE_DATA() on the file inode. The network namespace must be accessed by
+ * pde_data() on the file inode. The network namespace must be accessed by
* calling seq_file_net() on the seq_file struct.
*/
struct proc_dir_entry *proc_create_net_data_write(const char *name, umode_t mode,
@@ -230,7 +230,7 @@ EXPORT_SYMBOL_GPL(proc_create_net_single
* @parent: The parent directory in which to create.
* @show: The seqfile show method with which to read the file.
* @write: The write method with which to 'modify' the file.
- * @data: Data for retrieval by PDE_DATA().
+ * @data: Data for retrieval by pde_data().
*
* Create a network-namespaced proc file in the @parent directory with the
* specified @name and @mode that allows reading of a file that displays a
@@ -245,7 +245,7 @@ EXPORT_SYMBOL_GPL(proc_create_net_single
* modified by the @write function. @write should return 0 on success.
*
* The @data value is accessible from the @show and @write functions by calling
- * PDE_DATA() on the file inode. The network namespace must be accessed by
+ * pde_data() on the file inode. The network namespace must be accessed by
* calling seq_file_single_net() on the seq_file struct.
*/
struct proc_dir_entry *proc_create_net_single_write(const char *name, umode_t mode,
--- a/include/linux/proc_fs.h~proc-remove-pde_data-completely
+++ a/include/linux/proc_fs.h
@@ -120,8 +120,6 @@ static inline void *pde_data(const struc
return inode->i_private;
}
-#define PDE_DATA(i) pde_data(i)
-
extern void *proc_get_parent_data(const struct inode *);
extern void proc_remove(struct proc_dir_entry *);
extern void remove_proc_entry(const char *, struct proc_dir_entry *);
@@ -202,7 +200,7 @@ proc_create_data(const char *name, umode
static inline void proc_set_size(struct proc_dir_entry *de, loff_t size) {}
static inline void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) {}
-static inline void *PDE_DATA(const struct inode *inode) {BUG(); return NULL;}
+static inline void *pde_data(const struct inode *inode) {BUG(); return NULL;}
static inline void *proc_get_parent_data(const struct inode *inode) { BUG(); return NULL; }
static inline void proc_remove(struct proc_dir_entry *de) {}
--- a/include/linux/seq_file.h~proc-remove-pde_data-completely
+++ a/include/linux/seq_file.h
@@ -209,7 +209,7 @@ static const struct file_operations __na
#define DEFINE_PROC_SHOW_ATTRIBUTE(__name) \
static int __name ## _open(struct inode *inode, struct file *file) \
{ \
- return single_open(file, __name ## _show, PDE_DATA(inode)); \
+ return single_open(file, __name ## _show, pde_data(inode)); \
} \
\
static const struct proc_ops __name ## _proc_ops = { \
--- a/ipc/util.c~proc-remove-pde_data-completely
+++ a/ipc/util.c
@@ -894,7 +894,7 @@ static int sysvipc_proc_open(struct inod
if (!iter)
return -ENOMEM;
- iter->iface = PDE_DATA(inode);
+ iter->iface = pde_data(inode);
iter->ns = get_ipc_ns(current->nsproxy->ipc_ns);
iter->pid_ns = get_pid_ns(task_active_pid_ns(current));
--- a/kernel/irq/proc.c~proc-remove-pde_data-completely
+++ a/kernel/irq/proc.c
@@ -137,7 +137,7 @@ static inline int irq_select_affinity_us
static ssize_t write_irq_affinity(int type, struct file *file,
const char __user *buffer, size_t count, loff_t *pos)
{
- unsigned int irq = (int)(long)PDE_DATA(file_inode(file));
+ unsigned int irq = (int)(long)pde_data(file_inode(file));
cpumask_var_t new_value;
int err;
@@ -190,12 +190,12 @@ static ssize_t irq_affinity_list_proc_wr
static int irq_affinity_proc_open(struct inode *inode, struct file *file)
{
- return single_open(file, irq_affinity_proc_show, PDE_DATA(inode));
+ return single_open(file, irq_affinity_proc_show, pde_data(inode));
}
static int irq_affinity_list_proc_open(struct inode *inode, struct file *file)
{
- return single_open(file, irq_affinity_list_proc_show, PDE_DATA(inode));
+ return single_open(file, irq_affinity_list_proc_show, pde_data(inode));
}
static const struct proc_ops irq_affinity_proc_ops = {
@@ -265,7 +265,7 @@ out:
static int default_affinity_open(struct inode *inode, struct file *file)
{
- return single_open(file, default_affinity_show, PDE_DATA(inode));
+ return single_open(file, default_affinity_show, pde_data(inode));
}
static const struct proc_ops default_affinity_proc_ops = {
--- a/kernel/resource.c~proc-remove-pde_data-completely
+++ a/kernel/resource.c
@@ -99,7 +99,7 @@ enum { MAX_IORES_LEVEL = 5 };
static void *r_start(struct seq_file *m, loff_t *pos)
__acquires(resource_lock)
{
- struct resource *p = PDE_DATA(file_inode(m->file));
+ struct resource *p = pde_data(file_inode(m->file));
loff_t l = 0;
read_lock(&resource_lock);
for (p = p->child; p && l < *pos; p = r_next(m, p, &l))
@@ -115,7 +115,7 @@ static void r_stop(struct seq_file *m, v
static int r_show(struct seq_file *m, void *v)
{
- struct resource *root = PDE_DATA(file_inode(m->file));
+ struct resource *root = pde_data(file_inode(m->file));
struct resource *r = v, *p;
unsigned long long start, end;
int width = root->end < 0x10000 ? 4 : 8;
--- a/net/atm/proc.c~proc-remove-pde_data-completely
+++ a/net/atm/proc.c
@@ -108,7 +108,7 @@ out:
static inline void *vcc_walk(struct seq_file *seq, loff_t l)
{
struct vcc_state *state = seq->private;
- int family = (uintptr_t)(PDE_DATA(file_inode(seq->file)));
+ int family = (uintptr_t)(pde_data(file_inode(seq->file)));
return __vcc_walk(&state->sk, family, &state->bucket, l) ?
state : NULL;
@@ -324,7 +324,7 @@ static ssize_t proc_dev_atm_read(struct
page = get_zeroed_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
- dev = PDE_DATA(file_inode(file));
+ dev = pde_data(file_inode(file));
if (!dev->ops->proc_read)
length = -EINVAL;
else {
--- a/net/bluetooth/af_bluetooth.c~proc-remove-pde_data-completely
+++ a/net/bluetooth/af_bluetooth.c
@@ -611,7 +611,7 @@ EXPORT_SYMBOL(bt_sock_wait_ready);
static void *bt_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(seq->private->l->lock)
{
- struct bt_sock_list *l = PDE_DATA(file_inode(seq->file));
+ struct bt_sock_list *l = pde_data(file_inode(seq->file));
read_lock(&l->lock);
return seq_hlist_start_head(&l->head, *pos);
@@ -619,7 +619,7 @@ static void *bt_seq_start(struct seq_fil
static void *bt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
- struct bt_sock_list *l = PDE_DATA(file_inode(seq->file));
+ struct bt_sock_list *l = pde_data(file_inode(seq->file));
return seq_hlist_next(v, &l->head, pos);
}
@@ -627,14 +627,14 @@ static void *bt_seq_next(struct seq_file
static void bt_seq_stop(struct seq_file *seq, void *v)
__releases(seq->private->l->lock)
{
- struct bt_sock_list *l = PDE_DATA(file_inode(seq->file));
+ struct bt_sock_list *l = pde_data(file_inode(seq->file));
read_unlock(&l->lock);
}
static int bt_seq_show(struct seq_file *seq, void *v)
{
- struct bt_sock_list *l = PDE_DATA(file_inode(seq->file));
+ struct bt_sock_list *l = pde_data(file_inode(seq->file));
if (v == SEQ_START_TOKEN) {
seq_puts(seq, "sk RefCnt Rmem Wmem User Inode Parent");
--- a/net/can/bcm.c~proc-remove-pde_data-completely
+++ a/net/can/bcm.c
@@ -193,7 +193,7 @@ static int bcm_proc_show(struct seq_file
{
char ifname[IFNAMSIZ];
struct net *net = m->private;
- struct sock *sk = (struct sock *)PDE_DATA(m->file->f_inode);
+ struct sock *sk = (struct sock *)pde_data(m->file->f_inode);
struct bcm_sock *bo = bcm_sk(sk);
struct bcm_op *op;
--- a/net/can/proc.c~proc-remove-pde_data-completely
+++ a/net/can/proc.c
@@ -305,7 +305,7 @@ static inline void can_rcvlist_proc_show
static int can_rcvlist_proc_show(struct seq_file *m, void *v)
{
/* double cast to prevent GCC warning */
- int idx = (int)(long)PDE_DATA(m->file->f_inode);
+ int idx = (int)(long)pde_data(m->file->f_inode);
struct net_device *dev;
struct can_dev_rcv_lists *dev_rcv_lists;
struct net *net = m->private;
--- a/net/core/neighbour.c~proc-remove-pde_data-completely
+++ a/net/core/neighbour.c
@@ -3364,7 +3364,7 @@ EXPORT_SYMBOL(neigh_seq_stop);
static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos)
{
- struct neigh_table *tbl = PDE_DATA(file_inode(seq->file));
+ struct neigh_table *tbl = pde_data(file_inode(seq->file));
int cpu;
if (*pos == 0)
@@ -3381,7 +3381,7 @@ static void *neigh_stat_seq_start(struct
static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
- struct neigh_table *tbl = PDE_DATA(file_inode(seq->file));
+ struct neigh_table *tbl = pde_data(file_inode(seq->file));
int cpu;
for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
@@ -3401,7 +3401,7 @@ static void neigh_stat_seq_stop(struct s
static int neigh_stat_seq_show(struct seq_file *seq, void *v)
{
- struct neigh_table *tbl = PDE_DATA(file_inode(seq->file));
+ struct neigh_table *tbl = pde_data(file_inode(seq->file));
struct neigh_statistics *st = v;
if (v == SEQ_START_TOKEN) {
--- a/net/core/pktgen.c~proc-remove-pde_data-completely
+++ a/net/core/pktgen.c
@@ -546,7 +546,7 @@ static ssize_t pgctrl_write(struct file
static int pgctrl_open(struct inode *inode, struct file *file)
{
- return single_open(file, pgctrl_show, PDE_DATA(inode));
+ return single_open(file, pgctrl_show, pde_data(inode));
}
static const struct proc_ops pktgen_proc_ops = {
@@ -1811,7 +1811,7 @@ static ssize_t pktgen_if_write(struct fi
static int pktgen_if_open(struct inode *inode, struct file *file)
{
- return single_open(file, pktgen_if_show, PDE_DATA(inode));
+ return single_open(file, pktgen_if_show, pde_data(inode));
}
static const struct proc_ops pktgen_if_proc_ops = {
@@ -1948,7 +1948,7 @@ out:
static int pktgen_thread_open(struct inode *inode, struct file *file)
{
- return single_open(file, pktgen_thread_show, PDE_DATA(inode));
+ return single_open(file, pktgen_thread_show, pde_data(inode));
}
static const struct proc_ops pktgen_thread_proc_ops = {
--- a/net/ipv4/netfilter/ipt_CLUSTERIP.c~proc-remove-pde_data-completely
+++ a/net/ipv4/netfilter/ipt_CLUSTERIP.c
@@ -776,7 +776,7 @@ static int clusterip_proc_open(struct in
if (!ret) {
struct seq_file *sf = file->private_data;
- struct clusterip_config *c = PDE_DATA(inode);
+ struct clusterip_config *c = pde_data(inode);
sf->private = c;
@@ -788,7 +788,7 @@ static int clusterip_proc_open(struct in
static int clusterip_proc_release(struct inode *inode, struct file *file)
{
- struct clusterip_config *c = PDE_DATA(inode);
+ struct clusterip_config *c = pde_data(inode);
int ret;
ret = seq_release(inode, file);
@@ -802,7 +802,7 @@ static int clusterip_proc_release(struct
static ssize_t clusterip_proc_write(struct file *file, const char __user *input,
size_t size, loff_t *ofs)
{
- struct clusterip_config *c = PDE_DATA(file_inode(file));
+ struct clusterip_config *c = pde_data(file_inode(file));
#define PROC_WRITELEN 10
char buffer[PROC_WRITELEN+1];
unsigned long nodenum;
--- a/net/ipv4/raw.c~proc-remove-pde_data-completely
+++ a/net/ipv4/raw.c
@@ -971,7 +971,7 @@ struct proto raw_prot = {
static struct sock *raw_get_first(struct seq_file *seq)
{
struct sock *sk;
- struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
+ struct raw_hashinfo *h = pde_data(file_inode(seq->file));
struct raw_iter_state *state = raw_seq_private(seq);
for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
@@ -987,7 +987,7 @@ found:
static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
{
- struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
+ struct raw_hashinfo *h = pde_data(file_inode(seq->file));
struct raw_iter_state *state = raw_seq_private(seq);
do {
@@ -1016,7 +1016,7 @@ static struct sock *raw_get_idx(struct s
void *raw_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(&h->lock)
{
- struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
+ struct raw_hashinfo *h = pde_data(file_inode(seq->file));
read_lock(&h->lock);
return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
@@ -1039,7 +1039,7 @@ EXPORT_SYMBOL_GPL(raw_seq_next);
void raw_seq_stop(struct seq_file *seq, void *v)
__releases(&h->lock)
{
- struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
+ struct raw_hashinfo *h = pde_data(file_inode(seq->file));
read_unlock(&h->lock);
}
--- a/net/ipv4/tcp_ipv4.c~proc-remove-pde_data-completely
+++ a/net/ipv4/tcp_ipv4.c
@@ -3002,7 +3002,7 @@ static unsigned short seq_file_family(co
#endif
/* Iterated from proc fs */
- afinfo = PDE_DATA(file_inode(seq->file));
+ afinfo = pde_data(file_inode(seq->file));
return afinfo->family;
}
--- a/net/ipv4/udp.c~proc-remove-pde_data-completely
+++ a/net/ipv4/udp.c
@@ -2960,7 +2960,7 @@ static struct sock *udp_get_first(struct
if (state->bpf_seq_afinfo)
afinfo = state->bpf_seq_afinfo;
else
- afinfo = PDE_DATA(file_inode(seq->file));
+ afinfo = pde_data(file_inode(seq->file));
for (state->bucket = start; state->bucket <= afinfo->udp_table->mask;
++state->bucket) {
@@ -2993,7 +2993,7 @@ static struct sock *udp_get_next(struct
if (state->bpf_seq_afinfo)
afinfo = state->bpf_seq_afinfo;
else
- afinfo = PDE_DATA(file_inode(seq->file));
+ afinfo = pde_data(file_inode(seq->file));
do {
sk = sk_next(sk);
@@ -3050,7 +3050,7 @@ void udp_seq_stop(struct seq_file *seq,
if (state->bpf_seq_afinfo)
afinfo = state->bpf_seq_afinfo;
else
- afinfo = PDE_DATA(file_inode(seq->file));
+ afinfo = pde_data(file_inode(seq->file));
if (state->bucket <= afinfo->udp_table->mask)
spin_unlock_bh(&afinfo->udp_table->hash[state->bucket].lock);
--- a/net/netfilter/x_tables.c~proc-remove-pde_data-completely
+++ a/net/netfilter/x_tables.c
@@ -1517,7 +1517,7 @@ EXPORT_SYMBOL_GPL(xt_unregister_table);
#ifdef CONFIG_PROC_FS
static void *xt_table_seq_start(struct seq_file *seq, loff_t *pos)
{
- u8 af = (unsigned long)PDE_DATA(file_inode(seq->file));
+ u8 af = (unsigned long)pde_data(file_inode(seq->file));
struct net *net = seq_file_net(seq);
struct xt_pernet *xt_net;
@@ -1529,7 +1529,7 @@ static void *xt_table_seq_start(struct s
static void *xt_table_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
- u8 af = (unsigned long)PDE_DATA(file_inode(seq->file));
+ u8 af = (unsigned long)pde_data(file_inode(seq->file));
struct net *net = seq_file_net(seq);
struct xt_pernet *xt_net;
@@ -1540,7 +1540,7 @@ static void *xt_table_seq_next(struct se
static void xt_table_seq_stop(struct seq_file *seq, void *v)
{
- u_int8_t af = (unsigned long)PDE_DATA(file_inode(seq->file));
+ u_int8_t af = (unsigned long)pde_data(file_inode(seq->file));
mutex_unlock(&xt[af].mutex);
}
@@ -1584,7 +1584,7 @@ static void *xt_mttg_seq_next(struct seq
[MTTG_TRAV_NFP_UNSPEC] = MTTG_TRAV_NFP_SPEC,
[MTTG_TRAV_NFP_SPEC] = MTTG_TRAV_DONE,
};
- uint8_t nfproto = (unsigned long)PDE_DATA(file_inode(seq->file));
+ uint8_t nfproto = (unsigned long)pde_data(file_inode(seq->file));
struct nf_mttg_trav *trav = seq->private;
if (ppos != NULL)
@@ -1633,7 +1633,7 @@ static void *xt_mttg_seq_start(struct se
static void xt_mttg_seq_stop(struct seq_file *seq, void *v)
{
- uint8_t nfproto = (unsigned long)PDE_DATA(file_inode(seq->file));
+ uint8_t nfproto = (unsigned long)pde_data(file_inode(seq->file));
struct nf_mttg_trav *trav = seq->private;
switch (trav->class) {
--- a/net/netfilter/xt_hashlimit.c~proc-remove-pde_data-completely
+++ a/net/netfilter/xt_hashlimit.c
@@ -1052,7 +1052,7 @@ static struct xt_match hashlimit_mt_reg[
static void *dl_seq_start(struct seq_file *s, loff_t *pos)
__acquires(htable->lock)
{
- struct xt_hashlimit_htable *htable = PDE_DATA(file_inode(s->file));
+ struct xt_hashlimit_htable *htable = pde_data(file_inode(s->file));
unsigned int *bucket;
spin_lock_bh(&htable->lock);
@@ -1069,7 +1069,7 @@ static void *dl_seq_start(struct seq_fil
static void *dl_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
- struct xt_hashlimit_htable *htable = PDE_DATA(file_inode(s->file));
+ struct xt_hashlimit_htable *htable = pde_data(file_inode(s->file));
unsigned int *bucket = v;
*pos = ++(*bucket);
@@ -1083,7 +1083,7 @@ static void *dl_seq_next(struct seq_file
static void dl_seq_stop(struct seq_file *s, void *v)
__releases(htable->lock)
{
- struct xt_hashlimit_htable *htable = PDE_DATA(file_inode(s->file));
+ struct xt_hashlimit_htable *htable = pde_data(file_inode(s->file));
unsigned int *bucket = v;
if (!IS_ERR(bucket))
@@ -1125,7 +1125,7 @@ static void dl_seq_print(struct dsthash_
static int dl_seq_real_show_v2(struct dsthash_ent *ent, u_int8_t family,
struct seq_file *s)
{
- struct xt_hashlimit_htable *ht = PDE_DATA(file_inode(s->file));
+ struct xt_hashlimit_htable *ht = pde_data(file_inode(s->file));
spin_lock(&ent->lock);
/* recalculate to show accurate numbers */
@@ -1140,7 +1140,7 @@ static int dl_seq_real_show_v2(struct ds
static int dl_seq_real_show_v1(struct dsthash_ent *ent, u_int8_t family,
struct seq_file *s)
{
- struct xt_hashlimit_htable *ht = PDE_DATA(file_inode(s->file));
+ struct xt_hashlimit_htable *ht = pde_data(file_inode(s->file));
spin_lock(&ent->lock);
/* recalculate to show accurate numbers */
@@ -1155,7 +1155,7 @@ static int dl_seq_real_show_v1(struct ds
static int dl_seq_real_show(struct dsthash_ent *ent, u_int8_t family,
struct seq_file *s)
{
- struct xt_hashlimit_htable *ht = PDE_DATA(file_inode(s->file));
+ struct xt_hashlimit_htable *ht = pde_data(file_inode(s->file));
spin_lock(&ent->lock);
/* recalculate to show accurate numbers */
@@ -1169,7 +1169,7 @@ static int dl_seq_real_show(struct dstha
static int dl_seq_show_v2(struct seq_file *s, void *v)
{
- struct xt_hashlimit_htable *htable = PDE_DATA(file_inode(s->file));
+ struct xt_hashlimit_htable *htable = pde_data(file_inode(s->file));
unsigned int *bucket = (unsigned int *)v;
struct dsthash_ent *ent;
@@ -1183,7 +1183,7 @@ static int dl_seq_show_v2(struct seq_fil
static int dl_seq_show_v1(struct seq_file *s, void *v)
{
- struct xt_hashlimit_htable *htable = PDE_DATA(file_inode(s->file));
+ struct xt_hashlimit_htable *htable = pde_data(file_inode(s->file));
unsigned int *bucket = v;
struct dsthash_ent *ent;
@@ -1197,7 +1197,7 @@ static int dl_seq_show_v1(struct seq_fil
static int dl_seq_show(struct seq_file *s, void *v)
{
- struct xt_hashlimit_htable *htable = PDE_DATA(file_inode(s->file));
+ struct xt_hashlimit_htable *htable = pde_data(file_inode(s->file));
unsigned int *bucket = v;
struct dsthash_ent *ent;
--- a/net/netfilter/xt_recent.c~proc-remove-pde_data-completely
+++ a/net/netfilter/xt_recent.c
@@ -551,7 +551,7 @@ static int recent_seq_open(struct inode
if (st == NULL)
return -ENOMEM;
- st->table = PDE_DATA(inode);
+ st->table = pde_data(inode);
return 0;
}
@@ -559,7 +559,7 @@ static ssize_t
recent_mt_proc_write(struct file *file, const char __user *input,
size_t size, loff_t *loff)
{
- struct recent_table *t = PDE_DATA(file_inode(file));
+ struct recent_table *t = pde_data(file_inode(file));
struct recent_entry *e;
char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")];
const char *c = buf;
--- a/net/sunrpc/auth_gss/svcauth_gss.c~proc-remove-pde_data-completely
+++ a/net/sunrpc/auth_gss/svcauth_gss.c
@@ -1433,7 +1433,7 @@ static bool use_gss_proxy(struct net *ne
static ssize_t write_gssp(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
- struct net *net = PDE_DATA(file_inode(file));
+ struct net *net = pde_data(file_inode(file));
char tbuf[20];
unsigned long i;
int res;
@@ -1461,7 +1461,7 @@ static ssize_t write_gssp(struct file *f
static ssize_t read_gssp(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
- struct net *net = PDE_DATA(file_inode(file));
+ struct net *net = pde_data(file_inode(file));
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
unsigned long p = *ppos;
char tbuf[10];
--- a/net/sunrpc/cache.c~proc-remove-pde_data-completely
+++ a/net/sunrpc/cache.c
@@ -1536,7 +1536,7 @@ static ssize_t write_flush(struct file *
static ssize_t cache_read_procfs(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
{
- struct cache_detail *cd = PDE_DATA(file_inode(filp));
+ struct cache_detail *cd = pde_data(file_inode(filp));
return cache_read(filp, buf, count, ppos, cd);
}
@@ -1544,14 +1544,14 @@ static ssize_t cache_read_procfs(struct
static ssize_t cache_write_procfs(struct file *filp, const char __user *buf,
size_t count, loff_t *ppos)
{
- struct cache_detail *cd = PDE_DATA(file_inode(filp));
+ struct cache_detail *cd = pde_data(file_inode(filp));
return cache_write(filp, buf, count, ppos, cd);
}
static __poll_t cache_poll_procfs(struct file *filp, poll_table *wait)
{
- struct cache_detail *cd = PDE_DATA(file_inode(filp));
+ struct cache_detail *cd = pde_data(file_inode(filp));
return cache_poll(filp, wait, cd);
}
@@ -1560,21 +1560,21 @@ static long cache_ioctl_procfs(struct fi
unsigned int cmd, unsigned long arg)
{
struct inode *inode = file_inode(filp);
- struct cache_detail *cd = PDE_DATA(inode);
+ struct cache_detail *cd = pde_data(inode);
return cache_ioctl(inode, filp, cmd, arg, cd);
}
static int cache_open_procfs(struct inode *inode, struct file *filp)
{
- struct cache_detail *cd = PDE_DATA(inode);
+ struct cache_detail *cd = pde_data(inode);
return cache_open(inode, filp, cd);
}
static int cache_release_procfs(struct inode *inode, struct file *filp)
{
- struct cache_detail *cd = PDE_DATA(inode);
+ struct cache_detail *cd = pde_data(inode);
return cache_release(inode, filp, cd);
}
@@ -1591,14 +1591,14 @@ static const struct proc_ops cache_chann
static int content_open_procfs(struct inode *inode, struct file *filp)
{
- struct cache_detail *cd = PDE_DATA(inode);
+ struct cache_detail *cd = pde_data(inode);
return content_open(inode, filp, cd);
}
static int content_release_procfs(struct inode *inode, struct file *filp)
{
- struct cache_detail *cd = PDE_DATA(inode);
+ struct cache_detail *cd = pde_data(inode);
return content_release(inode, filp, cd);
}
@@ -1612,14 +1612,14 @@ static const struct proc_ops content_pro
static int open_flush_procfs(struct inode *inode, struct file *filp)
{
- struct cache_detail *cd = PDE_DATA(inode);
+ struct cache_detail *cd = pde_data(inode);
return open_flush(inode, filp, cd);
}
static int release_flush_procfs(struct inode *inode, struct file *filp)
{
- struct cache_detail *cd = PDE_DATA(inode);
+ struct cache_detail *cd = pde_data(inode);
return release_flush(inode, filp, cd);
}
@@ -1627,7 +1627,7 @@ static int release_flush_procfs(struct i
static ssize_t read_flush_procfs(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
{
- struct cache_detail *cd = PDE_DATA(file_inode(filp));
+ struct cache_detail *cd = pde_data(file_inode(filp));
return read_flush(filp, buf, count, ppos, cd);
}
@@ -1636,7 +1636,7 @@ static ssize_t write_flush_procfs(struct
const char __user *buf,
size_t count, loff_t *ppos)
{
- struct cache_detail *cd = PDE_DATA(file_inode(filp));
+ struct cache_detail *cd = pde_data(file_inode(filp));
return write_flush(filp, buf, count, ppos, cd);
}
--- a/net/sunrpc/stats.c~proc-remove-pde_data-completely
+++ a/net/sunrpc/stats.c
@@ -66,7 +66,7 @@ static int rpc_proc_show(struct seq_file
static int rpc_proc_open(struct inode *inode, struct file *file)
{
- return single_open(file, rpc_proc_show, PDE_DATA(inode));
+ return single_open(file, rpc_proc_show, pde_data(inode));
}
static const struct proc_ops rpc_proc_ops = {
--- a/sound/core/info.c~proc-remove-pde_data-completely
+++ a/sound/core/info.c
@@ -234,7 +234,7 @@ static int snd_info_entry_mmap(struct fi
static int snd_info_entry_open(struct inode *inode, struct file *file)
{
- struct snd_info_entry *entry = PDE_DATA(inode);
+ struct snd_info_entry *entry = pde_data(inode);
struct snd_info_private_data *data;
int mode, err;
@@ -365,7 +365,7 @@ static int snd_info_seq_show(struct seq_
static int snd_info_text_entry_open(struct inode *inode, struct file *file)
{
- struct snd_info_entry *entry = PDE_DATA(inode);
+ struct snd_info_entry *entry = pde_data(inode);
struct snd_info_private_data *data;
int err;
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 55/69] lib/stackdepot: allow optional init and stack_table allocation by kvmalloc()
2022-01-22 6:10 incoming Andrew Morton
` (53 preceding siblings ...)
2022-01-22 6:14 ` [patch 54/69] proc: remove PDE_DATA() completely Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:14 ` [patch 56/69] lib/stackdepot: always do filter_irq_stacks() in stack_depot_save() Andrew Morton
` (13 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: airlied, akpm, andreyknvl, colin.king, daniel, dvyukov, edumazet,
elver, geert, glider, glittao, imran.f.khan, jani.nikula,
jirislaby, linux-mm, maarten.lankhorst, mm-commits, mripard,
naresh.kamboju, oliver.sang, rppt, ryabinin.a.a, sfr, torvalds,
tzimmermann, vbabka, vjitta
From: Vlastimil Babka <vbabka@suse.cz>
Subject: lib/stackdepot: allow optional init and stack_table allocation by kvmalloc()
Currently, enabling CONFIG_STACKDEPOT means its stack_table will be
allocated from memblock, even if stack depot ends up not actually used.
The default size of stack_table is 4MB on 32-bit, 8MB on 64-bit.
This is fine for use-cases such as KASAN which is also a config option and
has overhead on its own. But it's an issue for functionality that has to
be actually enabled on boot (page_owner) or depends on hardware (GPU
drivers) and thus the memory might be wasted. This was raised as an issue
[1] when attempting to add stackdepot support for SLUB's debug object
tracking functionality. It's common to build kernels with
CONFIG_SLUB_DEBUG and enable slub_debug on boot only when needed, or
create only specific kmem caches with debugging for testing purposes.
It would thus be more efficient if stackdepot's table was allocated only
when actually going to be used. This patch thus makes the allocation (and
whole stack_depot_init() call) optional:
- Add a CONFIG_STACKDEPOT_ALWAYS_INIT flag to keep using the current
well-defined point of allocation as part of mem_init(). Make CONFIG_KASAN
select this flag.
- Other users have to call stack_depot_init() as part of their own init when
it's determined that stack depot will actually be used. This may depend on
both config and runtime conditions. Convert current users which are
page_owner and several in the DRM subsystem. Same will be done for SLUB
later.
- Because the init might now be called after the boot-time memblock allocation
has given all memory to the buddy allocator, change stack_depot_init() to
allocate stack_table with kvmalloc() when memblock is no longer available.
Also handle allocation failure by disabling stackdepot (could have
theoretically happened even with memblock allocation previously), and don't
unnecessarily align the memblock allocation to its own size anymore.
[1] https://lore.kernel.org/all/CAMuHMdW=eoVzM1Re5FVoEN87nKfiLmM2+Ah7eNu2KXEhCvbZyA@mail.gmail.com/
Link: https://lkml.kernel.org/r/20211013073005.11351-1-vbabka@suse.cz
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Marco Elver <elver@google.com> # stackdepot
Cc: Marco Elver <elver@google.com>
Cc: Vijayanand Jitta <vjitta@codeaurora.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Oliver Glitta <glittao@gmail.com>
Cc: Imran Khan <imran.f.khan@oracle.com>
From: Colin Ian King <colin.king@canonical.com>
Subject: lib/stackdepot: fix spelling mistake and grammar in pr_err message
There is a spelling mistake of the work allocation so fix this and
re-phrase the message to make it easier to read.
Link: https://lkml.kernel.org/r/20211015104159.11282-1-colin.king@canonical.com
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
From: Vlastimil Babka <vbabka@suse.cz>
Subject: lib/stackdepot: allow optional init and stack_table allocation by kvmalloc() - fixup
On FLATMEM, we call page_ext_init_flatmem_late() just before
kmem_cache_init() which means stack_depot_init() (called by page owner
init) will not recognize properly it should use kvmalloc() and not
memblock_alloc(). memblock_alloc() will also not issue a warning and
return a block memory that can be invalid and cause kernel page fault when
saving stacks, as reported by the kernel test robot [1].
Fix this by moving page_ext_init_flatmem_late() below kmem_cache_init() so
that slab_is_available() is true during stack_depot_init(). SPARSEMEM
doesn't have this issue, as it doesn't do page_ext_init_flatmem_late(),
but a different page_ext_init() even later in the boot process.
Thanks to Mike Rapoport for pointing out the FLATMEM init ordering issue.
While at it, also actually resolve a checkpatch warning in stack_depot_init()
from DRM CI, which was supposed to be in the original patch already.
[1] https://lore.kernel.org/all/20211014085450.GC18719@xsang-OptiPlex-9020/
Link: https://lkml.kernel.org/r/6abd9213-19a9-6d58-cedc-2414386d2d81@suse.cz
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reported-by: kernel test robot <oliver.sang@intel.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
From: Vlastimil Babka <vbabka@suse.cz>
Subject: lib/stackdepot: allow optional init and stack_table allocation by kvmalloc() - fixup3
Due to cd06ab2fd48f ("drm/locking: add backtrace for locking contended
locks without backoff") landing recently to -next adding a new stack depot
user in drivers/gpu/drm/drm_modeset_lock.c we need to add an appropriate
call to stack_depot_init() there as well.
Link: https://lkml.kernel.org/r/2a692365-cfa1-64f2-34e0-8aa5674dce5e@suse.cz
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Naresh Kamboju <naresh.kamboju@linaro.org>
Cc: Marco Elver <elver@google.com>
Cc: Vijayanand Jitta <vjitta@codeaurora.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Oliver Glitta <glittao@gmail.com>
Cc: Imran Khan <imran.f.khan@oracle.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
From: Vlastimil Babka <vbabka@suse.cz>
Subject: lib/stackdepot: allow optional init and stack_table allocation by kvmalloc() - fixup4
Due to 4e66934eaadc ("lib: add reference counting tracking
infrastructure") landing recently to net-next adding a new stack depot
user in lib/ref_tracker.c we need to add an appropriate call to
stack_depot_init() there as well.
Link: https://lkml.kernel.org/r/45c1b738-1a2f-5b5f-2f6d-86fab206d01c@suse.cz
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Cc: Jiri Slab <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
drivers/gpu/drm/drm_dp_mst_topology.c | 1
drivers/gpu/drm/drm_mm.c | 4 ++
drivers/gpu/drm/drm_modeset_lock.c | 9 ++++++
drivers/gpu/drm/i915/intel_runtime_pm.c | 3 ++
include/linux/ref_tracker.h | 2 +
include/linux/stackdepot.h | 25 ++++++++++------
init/main.c | 9 ++++--
lib/Kconfig | 4 ++
lib/Kconfig.kasan | 2 -
lib/stackdepot.c | 33 ++++++++++++++++++----
mm/page_owner.c | 2 +
11 files changed, 76 insertions(+), 18 deletions(-)
--- a/drivers/gpu/drm/drm_dp_mst_topology.c~lib-stackdepot-allow-optional-init-and-stack_table-allocation-by-kvmalloc
+++ a/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -5511,6 +5511,7 @@ int drm_dp_mst_topology_mgr_init(struct
mutex_init(&mgr->probe_lock);
#if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
mutex_init(&mgr->topology_ref_history_lock);
+ stack_depot_init();
#endif
INIT_LIST_HEAD(&mgr->tx_msg_downq);
INIT_LIST_HEAD(&mgr->destroy_port_list);
--- a/drivers/gpu/drm/drm_mm.c~lib-stackdepot-allow-optional-init-and-stack_table-allocation-by-kvmalloc
+++ a/drivers/gpu/drm/drm_mm.c
@@ -980,6 +980,10 @@ void drm_mm_init(struct drm_mm *mm, u64
add_hole(&mm->head_node);
mm->scan_active = 0;
+
+#ifdef CONFIG_DRM_DEBUG_MM
+ stack_depot_init();
+#endif
}
EXPORT_SYMBOL(drm_mm_init);
--- a/drivers/gpu/drm/drm_modeset_lock.c~lib-stackdepot-allow-optional-init-and-stack_table-allocation-by-kvmalloc
+++ a/drivers/gpu/drm/drm_modeset_lock.c
@@ -107,6 +107,11 @@ static void __drm_stack_depot_print(depo
kfree(buf);
}
+
+static void __drm_stack_depot_init(void)
+{
+ stack_depot_init();
+}
#else /* CONFIG_DRM_DEBUG_MODESET_LOCK */
static depot_stack_handle_t __drm_stack_depot_save(void)
{
@@ -115,6 +120,9 @@ static depot_stack_handle_t __drm_stack_
static void __drm_stack_depot_print(depot_stack_handle_t stack_depot)
{
}
+static void __drm_stack_depot_init(void)
+{
+}
#endif /* CONFIG_DRM_DEBUG_MODESET_LOCK */
/**
@@ -359,6 +367,7 @@ void drm_modeset_lock_init(struct drm_mo
{
ww_mutex_init(&lock->mutex, &crtc_ww_class);
INIT_LIST_HEAD(&lock->head);
+ __drm_stack_depot_init();
}
EXPORT_SYMBOL(drm_modeset_lock_init);
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c~lib-stackdepot-allow-optional-init-and-stack_table-allocation-by-kvmalloc
+++ a/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -68,6 +68,9 @@ static noinline depot_stack_handle_t __s
static void init_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm)
{
spin_lock_init(&rpm->debug.lock);
+
+ if (rpm->available)
+ stack_depot_init();
}
static noinline depot_stack_handle_t
--- a/include/linux/ref_tracker.h~lib-stackdepot-allow-optional-init-and-stack_table-allocation-by-kvmalloc
+++ a/include/linux/ref_tracker.h
@@ -4,6 +4,7 @@
#include <linux/refcount.h>
#include <linux/types.h>
#include <linux/spinlock.h>
+#include <linux/stackdepot.h>
struct ref_tracker;
@@ -26,6 +27,7 @@ static inline void ref_tracker_dir_init(
spin_lock_init(&dir->lock);
dir->quarantine_avail = quarantine_count;
refcount_set(&dir->untracked, 1);
+ stack_depot_init();
}
void ref_tracker_dir_exit(struct ref_tracker_dir *dir);
--- a/include/linux/stackdepot.h~lib-stackdepot-allow-optional-init-and-stack_table-allocation-by-kvmalloc
+++ a/include/linux/stackdepot.h
@@ -19,6 +19,22 @@ depot_stack_handle_t __stack_depot_save(
unsigned int nr_entries,
gfp_t gfp_flags, bool can_alloc);
+/*
+ * Every user of stack depot has to call this during its own init when it's
+ * decided that it will be calling stack_depot_save() later.
+ *
+ * The alternative is to select STACKDEPOT_ALWAYS_INIT to have stack depot
+ * enabled as part of mm_init(), for subsystems where it's known at compile time
+ * that stack depot will be used.
+ */
+int stack_depot_init(void);
+
+#ifdef CONFIG_STACKDEPOT_ALWAYS_INIT
+static inline int stack_depot_early_init(void) { return stack_depot_init(); }
+#else
+static inline int stack_depot_early_init(void) { return 0; }
+#endif
+
depot_stack_handle_t stack_depot_save(unsigned long *entries,
unsigned int nr_entries, gfp_t gfp_flags);
@@ -30,13 +46,4 @@ int stack_depot_snprint(depot_stack_hand
void stack_depot_print(depot_stack_handle_t stack);
-#ifdef CONFIG_STACKDEPOT
-int stack_depot_init(void);
-#else
-static inline int stack_depot_init(void)
-{
- return 0;
-}
-#endif /* CONFIG_STACKDEPOT */
-
#endif
--- a/init/main.c~lib-stackdepot-allow-optional-init-and-stack_table-allocation-by-kvmalloc
+++ a/init/main.c
@@ -834,12 +834,15 @@ static void __init mm_init(void)
init_mem_debugging_and_hardening();
kfence_alloc_pool();
report_meminit();
- stack_depot_init();
+ stack_depot_early_init();
mem_init();
mem_init_print_info();
- /* page_owner must be initialized after buddy is ready */
- page_ext_init_flatmem_late();
kmem_cache_init();
+ /*
+ * page_owner must be initialized after buddy is ready, and also after
+ * slab is ready so that stack_depot_init() works properly
+ */
+ page_ext_init_flatmem_late();
kmemleak_init();
pgtable_init();
debug_objects_mem_init();
--- a/lib/Kconfig~lib-stackdepot-allow-optional-init-and-stack_table-allocation-by-kvmalloc
+++ a/lib/Kconfig
@@ -673,6 +673,10 @@ config STACKDEPOT
bool
select STACKTRACE
+config STACKDEPOT_ALWAYS_INIT
+ bool
+ select STACKDEPOT
+
config STACK_HASH_ORDER
int "stack depot hash size (12 => 4KB, 20 => 1024KB)"
range 12 20
--- a/lib/Kconfig.kasan~lib-stackdepot-allow-optional-init-and-stack_table-allocation-by-kvmalloc
+++ a/lib/Kconfig.kasan
@@ -38,7 +38,7 @@ menuconfig KASAN
CC_HAS_WORKING_NOSANITIZE_ADDRESS) || \
HAVE_ARCH_KASAN_HW_TAGS
depends on (SLUB && SYSFS) || (SLAB && !DEBUG_SLAB)
- select STACKDEPOT
+ select STACKDEPOT_ALWAYS_INIT
help
Enables KASAN (KernelAddressSANitizer) - runtime memory debugger,
designed to find out-of-bounds accesses and use-after-free bugs.
--- a/lib/stackdepot.c~lib-stackdepot-allow-optional-init-and-stack_table-allocation-by-kvmalloc
+++ a/lib/stackdepot.c
@@ -23,6 +23,7 @@
#include <linux/jhash.h>
#include <linux/kernel.h>
#include <linux/mm.h>
+#include <linux/mutex.h>
#include <linux/percpu.h>
#include <linux/printk.h>
#include <linux/slab.h>
@@ -161,18 +162,40 @@ static int __init is_stack_depot_disable
}
early_param("stack_depot_disable", is_stack_depot_disabled);
-int __init stack_depot_init(void)
+/*
+ * __ref because of memblock_alloc(), which will not be actually called after
+ * the __init code is gone, because at that point slab_is_available() is true
+ */
+__ref int stack_depot_init(void)
{
- if (!stack_depot_disable) {
+ static DEFINE_MUTEX(stack_depot_init_mutex);
+
+ mutex_lock(&stack_depot_init_mutex);
+ if (!stack_depot_disable && !stack_table) {
size_t size = (STACK_HASH_SIZE * sizeof(struct stack_record *));
int i;
- stack_table = memblock_alloc(size, size);
- for (i = 0; i < STACK_HASH_SIZE; i++)
- stack_table[i] = NULL;
+ if (slab_is_available()) {
+ pr_info("Stack Depot allocating hash table with kvmalloc\n");
+ stack_table = kvmalloc(size, GFP_KERNEL);
+ } else {
+ pr_info("Stack Depot allocating hash table with memblock_alloc\n");
+ stack_table = memblock_alloc(size, SMP_CACHE_BYTES);
+ }
+ if (stack_table) {
+ for (i = 0; i < STACK_HASH_SIZE; i++)
+ stack_table[i] = NULL;
+ } else {
+ pr_err("Stack Depot hash table allocation failed, disabling\n");
+ stack_depot_disable = true;
+ mutex_unlock(&stack_depot_init_mutex);
+ return -ENOMEM;
+ }
}
+ mutex_unlock(&stack_depot_init_mutex);
return 0;
}
+EXPORT_SYMBOL_GPL(stack_depot_init);
/* Calculate hash for a stack */
static inline u32 hash_stack(unsigned long *entries, unsigned int size)
--- a/mm/page_owner.c~lib-stackdepot-allow-optional-init-and-stack_table-allocation-by-kvmalloc
+++ a/mm/page_owner.c
@@ -80,6 +80,8 @@ static __init void init_page_owner(void)
if (!page_owner_enabled)
return;
+ stack_depot_init();
+
register_dummy_stack();
register_failure_stack();
register_early_stack();
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 56/69] lib/stackdepot: always do filter_irq_stacks() in stack_depot_save()
2022-01-22 6:10 incoming Andrew Morton
` (54 preceding siblings ...)
2022-01-22 6:14 ` [patch 55/69] lib/stackdepot: allow optional init and stack_table allocation by kvmalloc() Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:14 ` [patch 57/69] mm: remove cleancache Andrew Morton
` (12 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: akpm, andreyknvl, chris, dvyukov, elver, glider, gustavoars,
imran.f.khan, jani.nikula, linux-mm, mika.kuoppala, mm-commits,
ryabinin.a.a, torvalds, vbabka, vjitta
From: Marco Elver <elver@google.com>
Subject: lib/stackdepot: always do filter_irq_stacks() in stack_depot_save()
The non-interrupt portion of interrupt stack traces before interrupt entry
is usually arbitrary. Therefore, saving stack traces of interrupts (that
include entries before interrupt entry) to stack depot leads to unbounded
stackdepot growth.
As such, use of filter_irq_stacks() is a requirement to ensure stackdepot
can efficiently deduplicate interrupt stacks.
Looking through all current users of stack_depot_save(), none (except
KASAN) pass the stack trace through filter_irq_stacks() before passing it
on to stack_depot_save().
Rather than adding filter_irq_stacks() to all current users of
stack_depot_save(), it became clear that stack_depot_save() should simply
do filter_irq_stacks().
Link: https://lkml.kernel.org/r/20211130095727.2378739-1-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Vijayanand Jitta <vjitta@codeaurora.org>
Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: Imran Khan <imran.f.khan@oracle.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
lib/stackdepot.c | 13 +++++++++++++
mm/kasan/common.c | 1 -
2 files changed, 13 insertions(+), 1 deletion(-)
--- a/lib/stackdepot.c~lib-stackdepot-always-do-filter_irq_stacks-in-stack_depot_save
+++ a/lib/stackdepot.c
@@ -328,6 +328,9 @@ EXPORT_SYMBOL_GPL(stack_depot_fetch);
* (allocates using GFP flags of @alloc_flags). If @can_alloc is %false, avoids
* any allocations and will fail if no space is left to store the stack trace.
*
+ * If the stack trace in @entries is from an interrupt, only the portion up to
+ * interrupt entry is saved.
+ *
* Context: Any context, but setting @can_alloc to %false is required if
* alloc_pages() cannot be used from the current context. Currently
* this is the case from contexts where neither %GFP_ATOMIC nor
@@ -346,6 +349,16 @@ depot_stack_handle_t __stack_depot_save(
unsigned long flags;
u32 hash;
+ /*
+ * If this stack trace is from an interrupt, including anything before
+ * interrupt entry usually leads to unbounded stackdepot growth.
+ *
+ * Because use of filter_irq_stacks() is a requirement to ensure
+ * stackdepot can efficiently deduplicate interrupt stacks, always
+ * filter_irq_stacks() to simplify all callers' use of stackdepot.
+ */
+ nr_entries = filter_irq_stacks(entries, nr_entries);
+
if (unlikely(nr_entries == 0) || stack_depot_disable)
goto fast_exit;
--- a/mm/kasan/common.c~lib-stackdepot-always-do-filter_irq_stacks-in-stack_depot_save
+++ a/mm/kasan/common.c
@@ -36,7 +36,6 @@ depot_stack_handle_t kasan_save_stack(gf
unsigned int nr_entries;
nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0);
- nr_entries = filter_irq_stacks(entries, nr_entries);
return __stack_depot_save(entries, nr_entries, flags, can_alloc);
}
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 57/69] mm: remove cleancache
2022-01-22 6:10 incoming Andrew Morton
` (55 preceding siblings ...)
2022-01-22 6:14 ` [patch 56/69] lib/stackdepot: always do filter_irq_stacks() in stack_depot_save() Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:14 ` [patch 58/69] frontswap: remove frontswap_writethrough Andrew Morton
` (11 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: akpm, ddstreet, geert, hch, hughd, jgross, Konrad.wilk, linux-mm,
mm-commits, sjenning, torvalds, vitaly.wool, willy
From: Christoph Hellwig <hch@lst.de>
Subject: mm: remove cleancache
Patch series "remove Xen tmem leftovers".
Since the removal of the Xen tmem driver in 2019, the cleancache hooks are
entirely unused, as are large parts of frontswap. This series against
linux-next (with the folio changes included) removes cleancaches, and cuts
down frontswap to the bits actually used by zswap.
This patch (of 13):
The cleancache subsystem is unused since the removal of Xen tmem driver in
commit 814bbf49dcd0 ("xen: remove tmem driver").
[akpm@linux-foundation.org: remove now-unreachable code]
Link: https://lkml.kernel.org/r/20211224062246.1258487-1-hch@lst.de
Link: https://lkml.kernel.org/r/20211224062246.1258487-2-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
Documentation/vm/cleancache.rst | 296 -----------------------
Documentation/vm/frontswap.rst | 12
Documentation/vm/index.rst | 1
MAINTAINERS | 7
arch/arm/configs/bcm2835_defconfig | 1
arch/arm/configs/qcom_defconfig | 1
arch/m68k/configs/amiga_defconfig | 1
arch/m68k/configs/apollo_defconfig | 1
arch/m68k/configs/atari_defconfig | 1
arch/m68k/configs/bvme6000_defconfig | 1
arch/m68k/configs/hp300_defconfig | 1
arch/m68k/configs/mac_defconfig | 1
arch/m68k/configs/multi_defconfig | 1
arch/m68k/configs/mvme147_defconfig | 1
arch/m68k/configs/mvme16x_defconfig | 1
arch/m68k/configs/q40_defconfig | 1
arch/m68k/configs/sun3_defconfig | 1
arch/m68k/configs/sun3x_defconfig | 1
arch/s390/configs/debug_defconfig | 1
arch/s390/configs/defconfig | 1
block/bdev.c | 5
fs/btrfs/extent_io.c | 10
fs/btrfs/super.c | 2
fs/ext4/readpage.c | 6
fs/ext4/super.c | 3
fs/f2fs/data.c | 13 -
fs/mpage.c | 7
fs/ntfs3/ntfs_fs.h | 1
fs/ocfs2/super.c | 2
fs/super.c | 3
include/linux/cleancache.h | 124 ---------
include/linux/fs.h | 5
mm/Kconfig | 22 -
mm/Makefile | 1
mm/cleancache.c | 315 -------------------------
mm/filemap.c | 11
mm/truncate.c | 15 -
37 files changed, 4 insertions(+), 873 deletions(-)
--- a/arch/arm/configs/bcm2835_defconfig~mm-remove-cleancache
+++ a/arch/arm/configs/bcm2835_defconfig
@@ -31,7 +31,6 @@ CONFIG_ARCH_BCM2835=y
CONFIG_PREEMPT_VOLUNTARY=y
CONFIG_AEABI=y
CONFIG_KSM=y
-CONFIG_CLEANCACHE=y
CONFIG_CMA=y
CONFIG_SECCOMP=y
CONFIG_KEXEC=y
--- a/arch/arm/configs/qcom_defconfig~mm-remove-cleancache
+++ a/arch/arm/configs/qcom_defconfig
@@ -27,7 +27,6 @@ CONFIG_PCIE_QCOM=y
CONFIG_SMP=y
CONFIG_PREEMPT=y
CONFIG_HIGHMEM=y
-CONFIG_CLEANCACHE=y
CONFIG_ARM_APPENDED_DTB=y
CONFIG_ARM_ATAG_DTB_COMPAT=y
CONFIG_CPU_IDLE=y
--- a/arch/m68k/configs/amiga_defconfig~mm-remove-cleancache
+++ a/arch/m68k/configs/amiga_defconfig
@@ -45,7 +45,6 @@ CONFIG_IOSCHED_BFQ=m
CONFIG_BINFMT_AOUT=m
CONFIG_BINFMT_MISC=m
# CONFIG_COMPACTION is not set
-CONFIG_CLEANCACHE=y
CONFIG_ZPOOL=m
CONFIG_NET=y
CONFIG_PACKET=y
--- a/arch/m68k/configs/apollo_defconfig~mm-remove-cleancache
+++ a/arch/m68k/configs/apollo_defconfig
@@ -41,7 +41,6 @@ CONFIG_IOSCHED_BFQ=m
CONFIG_BINFMT_AOUT=m
CONFIG_BINFMT_MISC=m
# CONFIG_COMPACTION is not set
-CONFIG_CLEANCACHE=y
CONFIG_ZPOOL=m
CONFIG_NET=y
CONFIG_PACKET=y
--- a/arch/m68k/configs/atari_defconfig~mm-remove-cleancache
+++ a/arch/m68k/configs/atari_defconfig
@@ -48,7 +48,6 @@ CONFIG_IOSCHED_BFQ=m
CONFIG_BINFMT_AOUT=m
CONFIG_BINFMT_MISC=m
# CONFIG_COMPACTION is not set
-CONFIG_CLEANCACHE=y
CONFIG_ZPOOL=m
CONFIG_NET=y
CONFIG_PACKET=y
--- a/arch/m68k/configs/bvme6000_defconfig~mm-remove-cleancache
+++ a/arch/m68k/configs/bvme6000_defconfig
@@ -38,7 +38,6 @@ CONFIG_IOSCHED_BFQ=m
CONFIG_BINFMT_AOUT=m
CONFIG_BINFMT_MISC=m
# CONFIG_COMPACTION is not set
-CONFIG_CLEANCACHE=y
CONFIG_ZPOOL=m
CONFIG_NET=y
CONFIG_PACKET=y
--- a/arch/m68k/configs/hp300_defconfig~mm-remove-cleancache
+++ a/arch/m68k/configs/hp300_defconfig
@@ -40,7 +40,6 @@ CONFIG_IOSCHED_BFQ=m
CONFIG_BINFMT_AOUT=m
CONFIG_BINFMT_MISC=m
# CONFIG_COMPACTION is not set
-CONFIG_CLEANCACHE=y
CONFIG_ZPOOL=m
CONFIG_NET=y
CONFIG_PACKET=y
--- a/arch/m68k/configs/mac_defconfig~mm-remove-cleancache
+++ a/arch/m68k/configs/mac_defconfig
@@ -39,7 +39,6 @@ CONFIG_IOSCHED_BFQ=m
CONFIG_BINFMT_AOUT=m
CONFIG_BINFMT_MISC=m
# CONFIG_COMPACTION is not set
-CONFIG_CLEANCACHE=y
CONFIG_ZPOOL=m
CONFIG_NET=y
CONFIG_PACKET=y
--- a/arch/m68k/configs/multi_defconfig~mm-remove-cleancache
+++ a/arch/m68k/configs/multi_defconfig
@@ -59,7 +59,6 @@ CONFIG_IOSCHED_BFQ=m
CONFIG_BINFMT_AOUT=m
CONFIG_BINFMT_MISC=m
# CONFIG_COMPACTION is not set
-CONFIG_CLEANCACHE=y
CONFIG_ZPOOL=m
CONFIG_NET=y
CONFIG_PACKET=y
--- a/arch/m68k/configs/mvme147_defconfig~mm-remove-cleancache
+++ a/arch/m68k/configs/mvme147_defconfig
@@ -37,7 +37,6 @@ CONFIG_IOSCHED_BFQ=m
CONFIG_BINFMT_AOUT=m
CONFIG_BINFMT_MISC=m
# CONFIG_COMPACTION is not set
-CONFIG_CLEANCACHE=y
CONFIG_ZPOOL=m
CONFIG_NET=y
CONFIG_PACKET=y
--- a/arch/m68k/configs/mvme16x_defconfig~mm-remove-cleancache
+++ a/arch/m68k/configs/mvme16x_defconfig
@@ -38,7 +38,6 @@ CONFIG_IOSCHED_BFQ=m
CONFIG_BINFMT_AOUT=m
CONFIG_BINFMT_MISC=m
# CONFIG_COMPACTION is not set
-CONFIG_CLEANCACHE=y
CONFIG_ZPOOL=m
CONFIG_NET=y
CONFIG_PACKET=y
--- a/arch/m68k/configs/q40_defconfig~mm-remove-cleancache
+++ a/arch/m68k/configs/q40_defconfig
@@ -39,7 +39,6 @@ CONFIG_IOSCHED_BFQ=m
CONFIG_BINFMT_AOUT=m
CONFIG_BINFMT_MISC=m
# CONFIG_COMPACTION is not set
-CONFIG_CLEANCACHE=y
CONFIG_ZPOOL=m
CONFIG_NET=y
CONFIG_PACKET=y
--- a/arch/m68k/configs/sun3_defconfig~mm-remove-cleancache
+++ a/arch/m68k/configs/sun3_defconfig
@@ -35,7 +35,6 @@ CONFIG_IOSCHED_BFQ=m
CONFIG_BINFMT_AOUT=m
CONFIG_BINFMT_MISC=m
# CONFIG_COMPACTION is not set
-CONFIG_CLEANCACHE=y
CONFIG_ZPOOL=m
CONFIG_NET=y
CONFIG_PACKET=y
--- a/arch/m68k/configs/sun3x_defconfig~mm-remove-cleancache
+++ a/arch/m68k/configs/sun3x_defconfig
@@ -35,7 +35,6 @@ CONFIG_IOSCHED_BFQ=m
CONFIG_BINFMT_AOUT=m
CONFIG_BINFMT_MISC=m
# CONFIG_COMPACTION is not set
-CONFIG_CLEANCACHE=y
CONFIG_ZPOOL=m
CONFIG_NET=y
CONFIG_PACKET=y
--- a/arch/s390/configs/debug_defconfig~mm-remove-cleancache
+++ a/arch/s390/configs/debug_defconfig
@@ -96,7 +96,6 @@ CONFIG_MEMORY_HOTPLUG=y
CONFIG_MEMORY_HOTREMOVE=y
CONFIG_KSM=y
CONFIG_TRANSPARENT_HUGEPAGE=y
-CONFIG_CLEANCACHE=y
CONFIG_FRONTSWAP=y
CONFIG_CMA_DEBUG=y
CONFIG_CMA_DEBUGFS=y
--- a/arch/s390/configs/defconfig~mm-remove-cleancache
+++ a/arch/s390/configs/defconfig
@@ -91,7 +91,6 @@ CONFIG_MEMORY_HOTPLUG=y
CONFIG_MEMORY_HOTREMOVE=y
CONFIG_KSM=y
CONFIG_TRANSPARENT_HUGEPAGE=y
-CONFIG_CLEANCACHE=y
CONFIG_FRONTSWAP=y
CONFIG_CMA_SYSFS=y
CONFIG_CMA_AREAS=7
--- a/block/bdev.c~mm-remove-cleancache
+++ a/block/bdev.c
@@ -24,7 +24,6 @@
#include <linux/pseudo_fs.h>
#include <linux/uio.h>
#include <linux/namei.h>
-#include <linux/cleancache.h>
#include <linux/part_stat.h>
#include <linux/uaccess.h>
#include "../fs/internal.h"
@@ -88,10 +87,6 @@ void invalidate_bdev(struct block_device
lru_add_drain_all(); /* make sure all lru add caches are flushed */
invalidate_mapping_pages(mapping, 0, -1);
}
- /* 99% of the time, we don't need to flush the cleancache on the bdev.
- * But, for the strange corners, lets be cautious
- */
- cleancache_invalidate_inode(mapping);
}
EXPORT_SYMBOL(invalidate_bdev);
--- a/Documentation/vm/cleancache.rst
+++ /dev/null
@@ -1,296 +0,0 @@
-.. _cleancache:
-
-==========
-Cleancache
-==========
-
-Motivation
-==========
-
-Cleancache is a new optional feature provided by the VFS layer that
-potentially dramatically increases page cache effectiveness for
-many workloads in many environments at a negligible cost.
-
-Cleancache can be thought of as a page-granularity victim cache for clean
-pages that the kernel's pageframe replacement algorithm (PFRA) would like
-to keep around, but can't since there isn't enough memory. So when the
-PFRA "evicts" a page, it first attempts to use cleancache code to
-put the data contained in that page into "transcendent memory", memory
-that is not directly accessible or addressable by the kernel and is
-of unknown and possibly time-varying size.
-
-Later, when a cleancache-enabled filesystem wishes to access a page
-in a file on disk, it first checks cleancache to see if it already
-contains it; if it does, the page of data is copied into the kernel
-and a disk access is avoided.
-
-Transcendent memory "drivers" for cleancache are currently implemented
-in Xen (using hypervisor memory) and zcache (using in-kernel compressed
-memory) and other implementations are in development.
-
-:ref:`FAQs <faq>` are included below.
-
-Implementation Overview
-=======================
-
-A cleancache "backend" that provides transcendent memory registers itself
-to the kernel's cleancache "frontend" by calling cleancache_register_ops,
-passing a pointer to a cleancache_ops structure with funcs set appropriately.
-The functions provided must conform to certain semantics as follows:
-
-Most important, cleancache is "ephemeral". Pages which are copied into
-cleancache have an indefinite lifetime which is completely unknowable
-by the kernel and so may or may not still be in cleancache at any later time.
-Thus, as its name implies, cleancache is not suitable for dirty pages.
-Cleancache has complete discretion over what pages to preserve and what
-pages to discard and when.
-
-Mounting a cleancache-enabled filesystem should call "init_fs" to obtain a
-pool id which, if positive, must be saved in the filesystem's superblock;
-a negative return value indicates failure. A "put_page" will copy a
-(presumably about-to-be-evicted) page into cleancache and associate it with
-the pool id, a file key, and a page index into the file. (The combination
-of a pool id, a file key, and an index is sometimes called a "handle".)
-A "get_page" will copy the page, if found, from cleancache into kernel memory.
-An "invalidate_page" will ensure the page no longer is present in cleancache;
-an "invalidate_inode" will invalidate all pages associated with the specified
-file; and, when a filesystem is unmounted, an "invalidate_fs" will invalidate
-all pages in all files specified by the given pool id and also surrender
-the pool id.
-
-An "init_shared_fs", like init_fs, obtains a pool id but tells cleancache
-to treat the pool as shared using a 128-bit UUID as a key. On systems
-that may run multiple kernels (such as hard partitioned or virtualized
-systems) that may share a clustered filesystem, and where cleancache
-may be shared among those kernels, calls to init_shared_fs that specify the
-same UUID will receive the same pool id, thus allowing the pages to
-be shared. Note that any security requirements must be imposed outside
-of the kernel (e.g. by "tools" that control cleancache). Or a
-cleancache implementation can simply disable shared_init by always
-returning a negative value.
-
-If a get_page is successful on a non-shared pool, the page is invalidated
-(thus making cleancache an "exclusive" cache). On a shared pool, the page
-is NOT invalidated on a successful get_page so that it remains accessible to
-other sharers. The kernel is responsible for ensuring coherency between
-cleancache (shared or not), the page cache, and the filesystem, using
-cleancache invalidate operations as required.
-
-Note that cleancache must enforce put-put-get coherency and get-get
-coherency. For the former, if two puts are made to the same handle but
-with different data, say AAA by the first put and BBB by the second, a
-subsequent get can never return the stale data (AAA). For get-get coherency,
-if a get for a given handle fails, subsequent gets for that handle will
-never succeed unless preceded by a successful put with that handle.
-
-Last, cleancache provides no SMP serialization guarantees; if two
-different Linux threads are simultaneously putting and invalidating a page
-with the same handle, the results are indeterminate. Callers must
-lock the page to ensure serial behavior.
-
-Cleancache Performance Metrics
-==============================
-
-If properly configured, monitoring of cleancache is done via debugfs in
-the `/sys/kernel/debug/cleancache` directory. The effectiveness of cleancache
-can be measured (across all filesystems) with:
-
-``succ_gets``
- number of gets that were successful
-
-``failed_gets``
- number of gets that failed
-
-``puts``
- number of puts attempted (all "succeed")
-
-``invalidates``
- number of invalidates attempted
-
-A backend implementation may provide additional metrics.
-
-.. _faq:
-
-FAQ
-===
-
-* Where's the value? (Andrew Morton)
-
-Cleancache provides a significant performance benefit to many workloads
-in many environments with negligible overhead by improving the
-effectiveness of the pagecache. Clean pagecache pages are
-saved in transcendent memory (RAM that is otherwise not directly
-addressable to the kernel); fetching those pages later avoids "refaults"
-and thus disk reads.
-
-Cleancache (and its sister code "frontswap") provide interfaces for
-this transcendent memory (aka "tmem"), which conceptually lies between
-fast kernel-directly-addressable RAM and slower DMA/asynchronous devices.
-Disallowing direct kernel or userland reads/writes to tmem
-is ideal when data is transformed to a different form and size (such
-as with compression) or secretly moved (as might be useful for write-
-balancing for some RAM-like devices). Evicted page-cache pages (and
-swap pages) are a great use for this kind of slower-than-RAM-but-much-
-faster-than-disk transcendent memory, and the cleancache (and frontswap)
-"page-object-oriented" specification provides a nice way to read and
-write -- and indirectly "name" -- the pages.
-
-In the virtual case, the whole point of virtualization is to statistically
-multiplex physical resources across the varying demands of multiple
-virtual machines. This is really hard to do with RAM and efforts to
-do it well with no kernel change have essentially failed (except in some
-well-publicized special-case workloads). Cleancache -- and frontswap --
-with a fairly small impact on the kernel, provide a huge amount
-of flexibility for more dynamic, flexible RAM multiplexing.
-Specifically, the Xen Transcendent Memory backend allows otherwise
-"fallow" hypervisor-owned RAM to not only be "time-shared" between multiple
-virtual machines, but the pages can be compressed and deduplicated to
-optimize RAM utilization. And when guest OS's are induced to surrender
-underutilized RAM (e.g. with "self-ballooning"), page cache pages
-are the first to go, and cleancache allows those pages to be
-saved and reclaimed if overall host system memory conditions allow.
-
-And the identical interface used for cleancache can be used in
-physical systems as well. The zcache driver acts as a memory-hungry
-device that stores pages of data in a compressed state. And
-the proposed "RAMster" driver shares RAM across multiple physical
-systems.
-
-* Why does cleancache have its sticky fingers so deep inside the
- filesystems and VFS? (Andrew Morton and Christoph Hellwig)
-
-The core hooks for cleancache in VFS are in most cases a single line
-and the minimum set are placed precisely where needed to maintain
-coherency (via cleancache_invalidate operations) between cleancache,
-the page cache, and disk. All hooks compile into nothingness if
-cleancache is config'ed off and turn into a function-pointer-
-compare-to-NULL if config'ed on but no backend claims the ops
-functions, or to a compare-struct-element-to-negative if a
-backend claims the ops functions but a filesystem doesn't enable
-cleancache.
-
-Some filesystems are built entirely on top of VFS and the hooks
-in VFS are sufficient, so don't require an "init_fs" hook; the
-initial implementation of cleancache didn't provide this hook.
-But for some filesystems (such as btrfs), the VFS hooks are
-incomplete and one or more hooks in fs-specific code are required.
-And for some other filesystems, such as tmpfs, cleancache may
-be counterproductive. So it seemed prudent to require a filesystem
-to "opt in" to use cleancache, which requires adding a hook in
-each filesystem. Not all filesystems are supported by cleancache
-only because they haven't been tested. The existing set should
-be sufficient to validate the concept, the opt-in approach means
-that untested filesystems are not affected, and the hooks in the
-existing filesystems should make it very easy to add more
-filesystems in the future.
-
-The total impact of the hooks to existing fs and mm files is only
-about 40 lines added (not counting comments and blank lines).
-
-* Why not make cleancache asynchronous and batched so it can more
- easily interface with real devices with DMA instead of copying each
- individual page? (Minchan Kim)
-
-The one-page-at-a-time copy semantics simplifies the implementation
-on both the frontend and backend and also allows the backend to
-do fancy things on-the-fly like page compression and
-page deduplication. And since the data is "gone" (copied into/out
-of the pageframe) before the cleancache get/put call returns,
-a great deal of race conditions and potential coherency issues
-are avoided. While the interface seems odd for a "real device"
-or for real kernel-addressable RAM, it makes perfect sense for
-transcendent memory.
-
-* Why is non-shared cleancache "exclusive"? And where is the
- page "invalidated" after a "get"? (Minchan Kim)
-
-The main reason is to free up space in transcendent memory and
-to avoid unnecessary cleancache_invalidate calls. If you want inclusive,
-the page can be "put" immediately following the "get". If
-put-after-get for inclusive becomes common, the interface could
-be easily extended to add a "get_no_invalidate" call.
-
-The invalidate is done by the cleancache backend implementation.
-
-* What's the performance impact?
-
-Performance analysis has been presented at OLS'09 and LCA'10.
-Briefly, performance gains can be significant on most workloads,
-especially when memory pressure is high (e.g. when RAM is
-overcommitted in a virtual workload); and because the hooks are
-invoked primarily in place of or in addition to a disk read/write,
-overhead is negligible even in worst case workloads. Basically
-cleancache replaces I/O with memory-copy-CPU-overhead; on older
-single-core systems with slow memory-copy speeds, cleancache
-has little value, but in newer multicore machines, especially
-consolidated/virtualized machines, it has great value.
-
-* How do I add cleancache support for filesystem X? (Boaz Harrash)
-
-Filesystems that are well-behaved and conform to certain
-restrictions can utilize cleancache simply by making a call to
-cleancache_init_fs at mount time. Unusual, misbehaving, or
-poorly layered filesystems must either add additional hooks
-and/or undergo extensive additional testing... or should just
-not enable the optional cleancache.
-
-Some points for a filesystem to consider:
-
- - The FS should be block-device-based (e.g. a ram-based FS such
- as tmpfs should not enable cleancache)
- - To ensure coherency/correctness, the FS must ensure that all
- file removal or truncation operations either go through VFS or
- add hooks to do the equivalent cleancache "invalidate" operations
- - To ensure coherency/correctness, either inode numbers must
- be unique across the lifetime of the on-disk file OR the
- FS must provide an "encode_fh" function.
- - The FS must call the VFS superblock alloc and deactivate routines
- or add hooks to do the equivalent cleancache calls done there.
- - To maximize performance, all pages fetched from the FS should
- go through the do_mpag_readpage routine or the FS should add
- hooks to do the equivalent (cf. btrfs)
- - Currently, the FS blocksize must be the same as PAGESIZE. This
- is not an architectural restriction, but no backends currently
- support anything different.
- - A clustered FS should invoke the "shared_init_fs" cleancache
- hook to get best performance for some backends.
-
-* Why not use the KVA of the inode as the key? (Christoph Hellwig)
-
-If cleancache would use the inode virtual address instead of
-inode/filehandle, the pool id could be eliminated. But, this
-won't work because cleancache retains pagecache data pages
-persistently even when the inode has been pruned from the
-inode unused list, and only invalidates the data page if the file
-gets removed/truncated. So if cleancache used the inode kva,
-there would be potential coherency issues if/when the inode
-kva is reused for a different file. Alternately, if cleancache
-invalidated the pages when the inode kva was freed, much of the value
-of cleancache would be lost because the cache of pages in cleanache
-is potentially much larger than the kernel pagecache and is most
-useful if the pages survive inode cache removal.
-
-* Why is a global variable required?
-
-The cleancache_enabled flag is checked in all of the frequently-used
-cleancache hooks. The alternative is a function call to check a static
-variable. Since cleancache is enabled dynamically at runtime, systems
-that don't enable cleancache would suffer thousands (possibly
-tens-of-thousands) of unnecessary function calls per second. So the
-global variable allows cleancache to be enabled by default at compile
-time, but have insignificant performance impact when cleancache remains
-disabled at runtime.
-
-* Does cleanache work with KVM?
-
-The memory model of KVM is sufficiently different that a cleancache
-backend may have less value for KVM. This remains to be tested,
-especially in an overcommitted system.
-
-* Does cleancache work in userspace? It sounds useful for
- memory hungry caches like web browsers. (Jamie Lokier)
-
-No plans yet, though we agree it sounds useful, at least for
-apps that bypass the page cache (e.g. O_DIRECT).
-
-Last updated: Dan Magenheimer, April 13 2011
--- a/Documentation/vm/frontswap.rst~mm-remove-cleancache
+++ a/Documentation/vm/frontswap.rst
@@ -8,12 +8,6 @@ Frontswap provides a "transcendent memor
In some environments, dramatic performance savings may be obtained because
swapped pages are saved in RAM (or a RAM-like device) instead of a swap disk.
-(Note, frontswap -- and :ref:`cleancache` (merged at 3.0) -- are the "frontends"
-and the only necessary changes to the core kernel for transcendent memory;
-all other supporting code -- the "backends" -- is implemented as drivers.
-See the LWN.net article `Transcendent memory in a nutshell`_
-for a detailed overview of frontswap and related kernel parts)
-
.. _Transcendent memory in a nutshell: https://lwn.net/Articles/454795/
Frontswap is so named because it can be thought of as the opposite of
@@ -87,11 +81,9 @@ This interface is ideal when data is tra
and size (such as with compression) or secretly moved (as might be
useful for write-balancing for some RAM-like devices). Swap pages (and
evicted page-cache pages) are a great use for this kind of slower-than-RAM-
-but-much-faster-than-disk "pseudo-RAM device" and the frontswap (and
-cleancache) interface to transcendent memory provides a nice way to read
-and write -- and indirectly "name" -- the pages.
+but-much-faster-than-disk "pseudo-RAM device".
-Frontswap -- and cleancache -- with a fairly small impact on the kernel,
+Frontswap with a fairly small impact on the kernel,
provides a huge amount of flexibility for more dynamic, flexible RAM
utilization in various system configurations:
--- a/Documentation/vm/index.rst~mm-remove-cleancache
+++ a/Documentation/vm/index.rst
@@ -15,7 +15,6 @@ algorithms. If you are looking for advi
active_mm
arch_pgtable_helpers
balance
- cleancache
damon/index
free_page_reporting
frontswap
--- a/fs/btrfs/extent_io.c~mm-remove-cleancache
+++ a/fs/btrfs/extent_io.c
@@ -12,7 +12,6 @@
#include <linux/writeback.h>
#include <linux/pagevec.h>
#include <linux/prefetch.h>
-#include <linux/cleancache.h>
#include <linux/fsverity.h>
#include "misc.h"
#include "extent_io.h"
@@ -3578,15 +3577,6 @@ int btrfs_do_readpage(struct page *page,
goto out;
}
- if (!PageUptodate(page)) {
- if (cleancache_get_page(page) == 0) {
- BUG_ON(blocksize != PAGE_SIZE);
- unlock_extent(tree, start, end);
- unlock_page(page);
- goto out;
- }
- }
-
if (page->index == last_byte >> PAGE_SHIFT) {
size_t zero_offset = offset_in_page(last_byte);
--- a/fs/btrfs/super.c~mm-remove-cleancache
+++ a/fs/btrfs/super.c
@@ -23,7 +23,6 @@
#include <linux/miscdevice.h>
#include <linux/magic.h>
#include <linux/slab.h>
-#include <linux/cleancache.h>
#include <linux/ratelimit.h>
#include <linux/crc32c.h>
#include <linux/btrfs.h>
@@ -1374,7 +1373,6 @@ static int btrfs_fill_super(struct super
goto fail_close;
}
- cleancache_init_fs(sb);
sb->s_flags |= SB_ACTIVE;
return 0;
--- a/fs/ext4/readpage.c~mm-remove-cleancache
+++ a/fs/ext4/readpage.c
@@ -43,7 +43,6 @@
#include <linux/writeback.h>
#include <linux/backing-dev.h>
#include <linux/pagevec.h>
-#include <linux/cleancache.h>
#include "ext4.h"
@@ -350,11 +349,6 @@ int ext4_mpage_readpages(struct inode *i
} else if (fully_mapped) {
SetPageMappedToDisk(page);
}
- if (fully_mapped && blocks_per_page == 1 &&
- !PageUptodate(page) && cleancache_get_page(page) == 0) {
- SetPageUptodate(page);
- goto confused;
- }
/*
* This page will go to BIO. Do we need to send this
--- a/fs/ext4/super.c~mm-remove-cleancache
+++ a/fs/ext4/super.c
@@ -39,7 +39,6 @@
#include <linux/log2.h>
#include <linux/crc16.h>
#include <linux/dax.h>
-#include <linux/cleancache.h>
#include <linux/uaccess.h>
#include <linux/iversion.h>
#include <linux/unicode.h>
@@ -3149,8 +3148,6 @@ done:
EXT4_BLOCKS_PER_GROUP(sb),
EXT4_INODES_PER_GROUP(sb),
sbi->s_mount_opt, sbi->s_mount_opt2);
-
- cleancache_init_fs(sb);
return err;
}
--- a/fs/f2fs/data.c~mm-remove-cleancache
+++ a/fs/f2fs/data.c
@@ -18,7 +18,6 @@
#include <linux/swap.h>
#include <linux/prefetch.h>
#include <linux/uio.h>
-#include <linux/cleancache.h>
#include <linux/sched/signal.h>
#include <linux/fiemap.h>
#include <linux/iomap.h>
@@ -2035,12 +2034,6 @@ got_it:
block_nr = map->m_pblk + block_in_file - map->m_lblk;
SetPageMappedToDisk(page);
- if (!PageUptodate(page) && (!PageSwapCache(page) &&
- !cleancache_get_page(page))) {
- SetPageUptodate(page);
- goto confused;
- }
-
if (!f2fs_is_valid_blkaddr(F2FS_I_SB(inode), block_nr,
DATA_GENERIC_ENHANCE_READ)) {
ret = -EFSCORRUPTED;
@@ -2096,12 +2089,6 @@ submit_and_realloc:
ClearPageError(page);
*last_block_in_bio = block_nr;
goto out;
-confused:
- if (bio) {
- __submit_bio(F2FS_I_SB(inode), bio, DATA);
- bio = NULL;
- }
- unlock_page(page);
out:
*bio_ret = bio;
return ret;
--- a/fs/mpage.c~mm-remove-cleancache
+++ a/fs/mpage.c
@@ -29,7 +29,6 @@
#include <linux/writeback.h>
#include <linux/backing-dev.h>
#include <linux/pagevec.h>
-#include <linux/cleancache.h>
#include "internal.h"
/*
@@ -284,12 +283,6 @@ static struct bio *do_mpage_readpage(str
SetPageMappedToDisk(page);
}
- if (fully_mapped && blocks_per_page == 1 && !PageUptodate(page) &&
- cleancache_get_page(page) == 0) {
- SetPageUptodate(page);
- goto confused;
- }
-
/*
* This page will go to BIO. Do we need to send this BIO off first?
*/
--- a/fs/ntfs3/ntfs_fs.h~mm-remove-cleancache
+++ a/fs/ntfs3/ntfs_fs.h
@@ -11,7 +11,6 @@
#include <linux/blkdev.h>
#include <linux/buffer_head.h>
-#include <linux/cleancache.h>
#include <linux/fs.h>
#include <linux/highmem.h>
#include <linux/kernel.h>
--- a/fs/ocfs2/super.c~mm-remove-cleancache
+++ a/fs/ocfs2/super.c
@@ -25,7 +25,6 @@
#include <linux/mount.h>
#include <linux/seq_file.h>
#include <linux/quotaops.h>
-#include <linux/cleancache.h>
#include <linux/signal.h>
#define CREATE_TRACE_POINTS
@@ -2283,7 +2282,6 @@ static int ocfs2_initialize_super(struct
mlog_errno(status);
goto bail;
}
- cleancache_init_shared_fs(sb);
osb->ocfs2_wq = alloc_ordered_workqueue("ocfs2_wq", WQ_MEM_RECLAIM);
if (!osb->ocfs2_wq) {
--- a/fs/super.c~mm-remove-cleancache
+++ a/fs/super.c
@@ -31,7 +31,6 @@
#include <linux/mutex.h>
#include <linux/backing-dev.h>
#include <linux/rculist_bl.h>
-#include <linux/cleancache.h>
#include <linux/fscrypt.h>
#include <linux/fsnotify.h>
#include <linux/lockdep.h>
@@ -260,7 +259,6 @@ static struct super_block *alloc_super(s
s->s_time_gran = 1000000000;
s->s_time_min = TIME64_MIN;
s->s_time_max = TIME64_MAX;
- s->cleancache_poolid = CLEANCACHE_NO_POOL;
s->s_shrink.seeks = DEFAULT_SEEKS;
s->s_shrink.scan_objects = super_cache_scan;
@@ -330,7 +328,6 @@ void deactivate_locked_super(struct supe
{
struct file_system_type *fs = s->s_type;
if (atomic_dec_and_test(&s->s_active)) {
- cleancache_invalidate_fs(s);
unregister_shrinker(&s->s_shrink);
fs->kill_sb(s);
--- a/include/linux/cleancache.h
+++ /dev/null
@@ -1,124 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_CLEANCACHE_H
-#define _LINUX_CLEANCACHE_H
-
-#include <linux/fs.h>
-#include <linux/exportfs.h>
-#include <linux/mm.h>
-
-#define CLEANCACHE_NO_POOL -1
-#define CLEANCACHE_NO_BACKEND -2
-#define CLEANCACHE_NO_BACKEND_SHARED -3
-
-#define CLEANCACHE_KEY_MAX 6
-
-/*
- * cleancache requires every file with a page in cleancache to have a
- * unique key unless/until the file is removed/truncated. For some
- * filesystems, the inode number is unique, but for "modern" filesystems
- * an exportable filehandle is required (see exportfs.h)
- */
-struct cleancache_filekey {
- union {
- ino_t ino;
- __u32 fh[CLEANCACHE_KEY_MAX];
- u32 key[CLEANCACHE_KEY_MAX];
- } u;
-};
-
-struct cleancache_ops {
- int (*init_fs)(size_t);
- int (*init_shared_fs)(uuid_t *uuid, size_t);
- int (*get_page)(int, struct cleancache_filekey,
- pgoff_t, struct page *);
- void (*put_page)(int, struct cleancache_filekey,
- pgoff_t, struct page *);
- void (*invalidate_page)(int, struct cleancache_filekey, pgoff_t);
- void (*invalidate_inode)(int, struct cleancache_filekey);
- void (*invalidate_fs)(int);
-};
-
-extern int cleancache_register_ops(const struct cleancache_ops *ops);
-extern void __cleancache_init_fs(struct super_block *);
-extern void __cleancache_init_shared_fs(struct super_block *);
-extern int __cleancache_get_page(struct page *);
-extern void __cleancache_put_page(struct page *);
-extern void __cleancache_invalidate_page(struct address_space *, struct page *);
-extern void __cleancache_invalidate_inode(struct address_space *);
-extern void __cleancache_invalidate_fs(struct super_block *);
-
-#ifdef CONFIG_CLEANCACHE
-#define cleancache_enabled (1)
-static inline bool cleancache_fs_enabled_mapping(struct address_space *mapping)
-{
- return mapping->host->i_sb->cleancache_poolid >= 0;
-}
-static inline bool cleancache_fs_enabled(struct page *page)
-{
- return cleancache_fs_enabled_mapping(page->mapping);
-}
-#else
-#define cleancache_enabled (0)
-#define cleancache_fs_enabled(_page) (0)
-#define cleancache_fs_enabled_mapping(_page) (0)
-#endif
-
-/*
- * The shim layer provided by these inline functions allows the compiler
- * to reduce all cleancache hooks to nothingness if CONFIG_CLEANCACHE
- * is disabled, to a single global variable check if CONFIG_CLEANCACHE
- * is enabled but no cleancache "backend" has dynamically enabled it,
- * and, for the most frequent cleancache ops, to a single global variable
- * check plus a superblock element comparison if CONFIG_CLEANCACHE is enabled
- * and a cleancache backend has dynamically enabled cleancache, but the
- * filesystem referenced by that cleancache op has not enabled cleancache.
- * As a result, CONFIG_CLEANCACHE can be enabled by default with essentially
- * no measurable performance impact.
- */
-
-static inline void cleancache_init_fs(struct super_block *sb)
-{
- if (cleancache_enabled)
- __cleancache_init_fs(sb);
-}
-
-static inline void cleancache_init_shared_fs(struct super_block *sb)
-{
- if (cleancache_enabled)
- __cleancache_init_shared_fs(sb);
-}
-
-static inline int cleancache_get_page(struct page *page)
-{
- if (cleancache_enabled && cleancache_fs_enabled(page))
- return __cleancache_get_page(page);
- return -1;
-}
-
-static inline void cleancache_put_page(struct page *page)
-{
- if (cleancache_enabled && cleancache_fs_enabled(page))
- __cleancache_put_page(page);
-}
-
-static inline void cleancache_invalidate_page(struct address_space *mapping,
- struct page *page)
-{
- /* careful... page->mapping is NULL sometimes when this is called */
- if (cleancache_enabled && cleancache_fs_enabled_mapping(mapping))
- __cleancache_invalidate_page(mapping, page);
-}
-
-static inline void cleancache_invalidate_inode(struct address_space *mapping)
-{
- if (cleancache_enabled && cleancache_fs_enabled_mapping(mapping))
- __cleancache_invalidate_inode(mapping);
-}
-
-static inline void cleancache_invalidate_fs(struct super_block *sb)
-{
- if (cleancache_enabled)
- __cleancache_invalidate_fs(sb);
-}
-
-#endif /* _LINUX_CLEANCACHE_H */
--- a/include/linux/fs.h~mm-remove-cleancache
+++ a/include/linux/fs.h
@@ -1535,11 +1535,6 @@ struct super_block {
const struct dentry_operations *s_d_op; /* default d_op for dentries */
- /*
- * Saved pool identifier for cleancache (-1 means none)
- */
- int cleancache_poolid;
-
struct shrinker s_shrink; /* per-sb shrinker handle */
/* Number of inodes with nlink == 0 but still referenced */
--- a/MAINTAINERS~mm-remove-cleancache
+++ a/MAINTAINERS
@@ -4705,13 +4705,6 @@ T: git git://git.kernel.org/pub/scm/linu
F: include/linux/cfi.h
F: kernel/cfi.c
-CLEANCACHE API
-M: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
-L: linux-kernel@vger.kernel.org
-S: Maintained
-F: include/linux/cleancache.h
-F: mm/cleancache.c
-
CLK API
M: Russell King <linux@armlinux.org.uk>
L: linux-clk@vger.kernel.org
--- a/mm/cleancache.c
+++ /dev/null
@@ -1,315 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Cleancache frontend
- *
- * This code provides the generic "frontend" layer to call a matching
- * "backend" driver implementation of cleancache. See
- * Documentation/vm/cleancache.rst for more information.
- *
- * Copyright (C) 2009-2010 Oracle Corp. All rights reserved.
- * Author: Dan Magenheimer
- */
-
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/exportfs.h>
-#include <linux/mm.h>
-#include <linux/debugfs.h>
-#include <linux/cleancache.h>
-
-/*
- * cleancache_ops is set by cleancache_register_ops to contain the pointers
- * to the cleancache "backend" implementation functions.
- */
-static const struct cleancache_ops *cleancache_ops __read_mostly;
-
-/*
- * Counters available via /sys/kernel/debug/cleancache (if debugfs is
- * properly configured. These are for information only so are not protected
- * against increment races.
- */
-static u64 cleancache_succ_gets;
-static u64 cleancache_failed_gets;
-static u64 cleancache_puts;
-static u64 cleancache_invalidates;
-
-static void cleancache_register_ops_sb(struct super_block *sb, void *unused)
-{
- switch (sb->cleancache_poolid) {
- case CLEANCACHE_NO_BACKEND:
- __cleancache_init_fs(sb);
- break;
- case CLEANCACHE_NO_BACKEND_SHARED:
- __cleancache_init_shared_fs(sb);
- break;
- }
-}
-
-/*
- * Register operations for cleancache. Returns 0 on success.
- */
-int cleancache_register_ops(const struct cleancache_ops *ops)
-{
- if (cmpxchg(&cleancache_ops, NULL, ops))
- return -EBUSY;
-
- /*
- * A cleancache backend can be built as a module and hence loaded after
- * a cleancache enabled filesystem has called cleancache_init_fs. To
- * handle such a scenario, here we call ->init_fs or ->init_shared_fs
- * for each active super block. To differentiate between local and
- * shared filesystems, we temporarily initialize sb->cleancache_poolid
- * to CLEANCACHE_NO_BACKEND or CLEANCACHE_NO_BACKEND_SHARED
- * respectively in case there is no backend registered at the time
- * cleancache_init_fs or cleancache_init_shared_fs is called.
- *
- * Since filesystems can be mounted concurrently with cleancache
- * backend registration, we have to be careful to guarantee that all
- * cleancache enabled filesystems that has been mounted by the time
- * cleancache_register_ops is called has got and all mounted later will
- * get cleancache_poolid. This is assured by the following statements
- * tied together:
- *
- * a) iterate_supers skips only those super blocks that has started
- * ->kill_sb
- *
- * b) if iterate_supers encounters a super block that has not finished
- * ->mount yet, it waits until it is finished
- *
- * c) cleancache_init_fs is called from ->mount and
- * cleancache_invalidate_fs is called from ->kill_sb
- *
- * d) we call iterate_supers after cleancache_ops has been set
- *
- * From a) it follows that if iterate_supers skips a super block, then
- * either the super block is already dead, in which case we do not need
- * to bother initializing cleancache for it, or it was mounted after we
- * initiated iterate_supers. In the latter case, it must have seen
- * cleancache_ops set according to d) and initialized cleancache from
- * ->mount by itself according to c). This proves that we call
- * ->init_fs at least once for each active super block.
- *
- * From b) and c) it follows that if iterate_supers encounters a super
- * block that has already started ->init_fs, it will wait until ->mount
- * and hence ->init_fs has finished, then check cleancache_poolid, see
- * that it has already been set and therefore do nothing. This proves
- * that we call ->init_fs no more than once for each super block.
- *
- * Combined together, the last two paragraphs prove the function
- * correctness.
- *
- * Note that various cleancache callbacks may proceed before this
- * function is called or even concurrently with it, but since
- * CLEANCACHE_NO_BACKEND is negative, they will all result in a noop
- * until the corresponding ->init_fs has been actually called and
- * cleancache_ops has been set.
- */
- iterate_supers(cleancache_register_ops_sb, NULL);
- return 0;
-}
-EXPORT_SYMBOL(cleancache_register_ops);
-
-/* Called by a cleancache-enabled filesystem at time of mount */
-void __cleancache_init_fs(struct super_block *sb)
-{
- int pool_id = CLEANCACHE_NO_BACKEND;
-
- if (cleancache_ops) {
- pool_id = cleancache_ops->init_fs(PAGE_SIZE);
- if (pool_id < 0)
- pool_id = CLEANCACHE_NO_POOL;
- }
- sb->cleancache_poolid = pool_id;
-}
-EXPORT_SYMBOL(__cleancache_init_fs);
-
-/* Called by a cleancache-enabled clustered filesystem at time of mount */
-void __cleancache_init_shared_fs(struct super_block *sb)
-{
- int pool_id = CLEANCACHE_NO_BACKEND_SHARED;
-
- if (cleancache_ops) {
- pool_id = cleancache_ops->init_shared_fs(&sb->s_uuid, PAGE_SIZE);
- if (pool_id < 0)
- pool_id = CLEANCACHE_NO_POOL;
- }
- sb->cleancache_poolid = pool_id;
-}
-EXPORT_SYMBOL(__cleancache_init_shared_fs);
-
-/*
- * If the filesystem uses exportable filehandles, use the filehandle as
- * the key, else use the inode number.
- */
-static int cleancache_get_key(struct inode *inode,
- struct cleancache_filekey *key)
-{
- int (*fhfn)(struct inode *, __u32 *fh, int *, struct inode *);
- int len = 0, maxlen = CLEANCACHE_KEY_MAX;
- struct super_block *sb = inode->i_sb;
-
- key->u.ino = inode->i_ino;
- if (sb->s_export_op != NULL) {
- fhfn = sb->s_export_op->encode_fh;
- if (fhfn) {
- len = (*fhfn)(inode, &key->u.fh[0], &maxlen, NULL);
- if (len <= FILEID_ROOT || len == FILEID_INVALID)
- return -1;
- if (maxlen > CLEANCACHE_KEY_MAX)
- return -1;
- }
- }
- return 0;
-}
-
-/*
- * "Get" data from cleancache associated with the poolid/inode/index
- * that were specified when the data was put to cleanache and, if
- * successful, use it to fill the specified page with data and return 0.
- * The pageframe is unchanged and returns -1 if the get fails.
- * Page must be locked by caller.
- *
- * The function has two checks before any action is taken - whether
- * a backend is registered and whether the sb->cleancache_poolid
- * is correct.
- */
-int __cleancache_get_page(struct page *page)
-{
- int ret = -1;
- int pool_id;
- struct cleancache_filekey key = { .u.key = { 0 } };
-
- if (!cleancache_ops) {
- cleancache_failed_gets++;
- goto out;
- }
-
- VM_BUG_ON_PAGE(!PageLocked(page), page);
- pool_id = page->mapping->host->i_sb->cleancache_poolid;
- if (pool_id < 0)
- goto out;
-
- if (cleancache_get_key(page->mapping->host, &key) < 0)
- goto out;
-
- ret = cleancache_ops->get_page(pool_id, key, page->index, page);
- if (ret == 0)
- cleancache_succ_gets++;
- else
- cleancache_failed_gets++;
-out:
- return ret;
-}
-EXPORT_SYMBOL(__cleancache_get_page);
-
-/*
- * "Put" data from a page to cleancache and associate it with the
- * (previously-obtained per-filesystem) poolid and the page's,
- * inode and page index. Page must be locked. Note that a put_page
- * always "succeeds", though a subsequent get_page may succeed or fail.
- *
- * The function has two checks before any action is taken - whether
- * a backend is registered and whether the sb->cleancache_poolid
- * is correct.
- */
-void __cleancache_put_page(struct page *page)
-{
- int pool_id;
- struct cleancache_filekey key = { .u.key = { 0 } };
-
- if (!cleancache_ops) {
- cleancache_puts++;
- return;
- }
-
- VM_BUG_ON_PAGE(!PageLocked(page), page);
- pool_id = page->mapping->host->i_sb->cleancache_poolid;
- if (pool_id >= 0 &&
- cleancache_get_key(page->mapping->host, &key) >= 0) {
- cleancache_ops->put_page(pool_id, key, page->index, page);
- cleancache_puts++;
- }
-}
-EXPORT_SYMBOL(__cleancache_put_page);
-
-/*
- * Invalidate any data from cleancache associated with the poolid and the
- * page's inode and page index so that a subsequent "get" will fail.
- *
- * The function has two checks before any action is taken - whether
- * a backend is registered and whether the sb->cleancache_poolid
- * is correct.
- */
-void __cleancache_invalidate_page(struct address_space *mapping,
- struct page *page)
-{
- /* careful... page->mapping is NULL sometimes when this is called */
- int pool_id = mapping->host->i_sb->cleancache_poolid;
- struct cleancache_filekey key = { .u.key = { 0 } };
-
- if (!cleancache_ops)
- return;
-
- if (pool_id >= 0) {
- VM_BUG_ON_PAGE(!PageLocked(page), page);
- if (cleancache_get_key(mapping->host, &key) >= 0) {
- cleancache_ops->invalidate_page(pool_id,
- key, page->index);
- cleancache_invalidates++;
- }
- }
-}
-EXPORT_SYMBOL(__cleancache_invalidate_page);
-
-/*
- * Invalidate all data from cleancache associated with the poolid and the
- * mappings's inode so that all subsequent gets to this poolid/inode
- * will fail.
- *
- * The function has two checks before any action is taken - whether
- * a backend is registered and whether the sb->cleancache_poolid
- * is correct.
- */
-void __cleancache_invalidate_inode(struct address_space *mapping)
-{
- int pool_id = mapping->host->i_sb->cleancache_poolid;
- struct cleancache_filekey key = { .u.key = { 0 } };
-
- if (!cleancache_ops)
- return;
-
- if (pool_id >= 0 && cleancache_get_key(mapping->host, &key) >= 0)
- cleancache_ops->invalidate_inode(pool_id, key);
-}
-EXPORT_SYMBOL(__cleancache_invalidate_inode);
-
-/*
- * Called by any cleancache-enabled filesystem at time of unmount;
- * note that pool_id is surrendered and may be returned by a subsequent
- * cleancache_init_fs or cleancache_init_shared_fs.
- */
-void __cleancache_invalidate_fs(struct super_block *sb)
-{
- int pool_id;
-
- pool_id = sb->cleancache_poolid;
- sb->cleancache_poolid = CLEANCACHE_NO_POOL;
-
- if (cleancache_ops && pool_id >= 0)
- cleancache_ops->invalidate_fs(pool_id);
-}
-EXPORT_SYMBOL(__cleancache_invalidate_fs);
-
-static int __init init_cleancache(void)
-{
-#ifdef CONFIG_DEBUG_FS
- struct dentry *root = debugfs_create_dir("cleancache", NULL);
-
- debugfs_create_u64("succ_gets", 0444, root, &cleancache_succ_gets);
- debugfs_create_u64("failed_gets", 0444, root, &cleancache_failed_gets);
- debugfs_create_u64("puts", 0444, root, &cleancache_puts);
- debugfs_create_u64("invalidates", 0444, root, &cleancache_invalidates);
-#endif
- return 0;
-}
-module_init(init_cleancache)
--- a/mm/filemap.c~mm-remove-cleancache
+++ a/mm/filemap.c
@@ -35,7 +35,6 @@
#include <linux/cpuset.h>
#include <linux/hugetlb.h>
#include <linux/memcontrol.h>
-#include <linux/cleancache.h>
#include <linux/shmem_fs.h>
#include <linux/rmap.h>
#include <linux/delayacct.h>
@@ -151,16 +150,6 @@ static void filemap_unaccount_folio(stru
{
long nr;
- /*
- * if we're uptodate, flush out into the cleancache, otherwise
- * invalidate any existing cleancache entries. We can't leave
- * stale data around in the cleancache once our page is gone
- */
- if (folio_test_uptodate(folio) && folio_test_mappedtodisk(folio))
- cleancache_put_page(&folio->page);
- else
- cleancache_invalidate_page(mapping, &folio->page);
-
VM_BUG_ON_FOLIO(folio_mapped(folio), folio);
if (!IS_ENABLED(CONFIG_DEBUG_VM) && unlikely(folio_mapped(folio))) {
int mapcount;
--- a/mm/Kconfig~mm-remove-cleancache
+++ a/mm/Kconfig
@@ -444,28 +444,6 @@ config USE_PERCPU_NUMA_NODE_ID
config HAVE_SETUP_PER_CPU_AREA
bool
-config CLEANCACHE
- bool "Enable cleancache driver to cache clean pages if tmem is present"
- help
- Cleancache can be thought of as a page-granularity victim cache
- for clean pages that the kernel's pageframe replacement algorithm
- (PFRA) would like to keep around, but can't since there isn't enough
- memory. So when the PFRA "evicts" a page, it first attempts to use
- cleancache code to put the data contained in that page into
- "transcendent memory", memory that is not directly accessible or
- addressable by the kernel and is of unknown and possibly
- time-varying size. And when a cleancache-enabled
- filesystem wishes to access a page in a file on disk, it first
- checks cleancache to see if it already contains it; if it does,
- the page is copied into the kernel and a disk access is avoided.
- When a transcendent memory driver is available (such as zcache or
- Xen transcendent memory), a significant I/O reduction
- may be achieved. When none is available, all cleancache calls
- are reduced to a single pointer-compare-against-NULL resulting
- in a negligible performance hit.
-
- If unsure, say Y to enable cleancache
-
config FRONTSWAP
bool "Enable frontswap to cache swap pages if tmem is present"
depends on SWAP
--- a/mm/Makefile~mm-remove-cleancache
+++ a/mm/Makefile
@@ -104,7 +104,6 @@ obj-$(CONFIG_DEBUG_KMEMLEAK) += kmemleak
obj-$(CONFIG_DEBUG_RODATA_TEST) += rodata_test.o
obj-$(CONFIG_DEBUG_VM_PGTABLE) += debug_vm_pgtable.o
obj-$(CONFIG_PAGE_OWNER) += page_owner.o
-obj-$(CONFIG_CLEANCACHE) += cleancache.o
obj-$(CONFIG_MEMORY_ISOLATION) += page_isolation.o
obj-$(CONFIG_ZPOOL) += zpool.o
obj-$(CONFIG_ZBUD) += zbud.o
--- a/mm/truncate.c~mm-remove-cleancache
+++ a/mm/truncate.c
@@ -22,7 +22,6 @@
#include <linux/buffer_head.h> /* grr. try_to_release_page,
do_invalidatepage */
#include <linux/shmem_fs.h>
-#include <linux/cleancache.h>
#include <linux/rmap.h>
#include "internal.h"
@@ -264,7 +263,6 @@ bool truncate_inode_partial_folio(struct
*/
folio_zero_range(folio, offset, length);
- cleancache_invalidate_page(folio->mapping, &folio->page);
if (folio_has_private(folio))
do_invalidatepage(&folio->page, offset, length);
if (!folio_test_large(folio))
@@ -351,7 +349,7 @@ void truncate_inode_pages_range(struct a
bool same_folio;
if (mapping_empty(mapping))
- goto out;
+ return;
/*
* 'start' and 'end' always covers the range of pages to be fully
@@ -442,9 +440,6 @@ void truncate_inode_pages_range(struct a
folio_batch_release(&fbatch);
index++;
}
-
-out:
- cleancache_invalidate_inode(mapping);
}
EXPORT_SYMBOL(truncate_inode_pages_range);
@@ -498,10 +493,6 @@ void truncate_inode_pages_final(struct a
xa_unlock_irq(&mapping->i_pages);
}
- /*
- * Cleancache needs notification even if there are no pages or shadow
- * entries.
- */
truncate_inode_pages(mapping, 0);
}
EXPORT_SYMBOL(truncate_inode_pages_final);
@@ -661,7 +652,7 @@ int invalidate_inode_pages2_range(struct
int did_range_unmap = 0;
if (mapping_empty(mapping))
- goto out;
+ return 0;
folio_batch_init(&fbatch);
index = start;
@@ -725,8 +716,6 @@ int invalidate_inode_pages2_range(struct
if (dax_mapping(mapping)) {
unmap_mapping_pages(mapping, start, end - start + 1, false);
}
-out:
- cleancache_invalidate_inode(mapping);
return ret;
}
EXPORT_SYMBOL_GPL(invalidate_inode_pages2_range);
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 58/69] frontswap: remove frontswap_writethrough
2022-01-22 6:10 incoming Andrew Morton
` (56 preceding siblings ...)
2022-01-22 6:14 ` [patch 57/69] mm: remove cleancache Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:14 ` [patch 59/69] frontswap: remove frontswap_tmem_exclusive_gets Andrew Morton
` (10 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: akpm, ddstreet, geert, hch, hughd, jgross, Konrad.wilk, linux-mm,
mm-commits, sjenning, torvalds, vitaly.wool, willy
From: Christoph Hellwig <hch@lst.de>
Subject: frontswap: remove frontswap_writethrough
frontswap_writethrough is never called, so remove it.
Link: https://lkml.kernel.org/r/20211224062246.1258487-3-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
Documentation/vm/frontswap.rst | 6 ------
include/linux/frontswap.h | 1 -
mm/frontswap.c | 23 +----------------------
3 files changed, 1 insertion(+), 29 deletions(-)
--- a/Documentation/vm/frontswap.rst~frontswap-remove-frontswap_writethrough
+++ a/Documentation/vm/frontswap.rst
@@ -39,12 +39,6 @@ a disk write and, if the data is later r
If a store returns failure, transcendent memory has rejected the data, and the
page can be written to swap as usual.
-If a backend chooses, frontswap can be configured as a "writethrough
-cache" by calling frontswap_writethrough(). In this mode, the reduction
-in swap device writes is lost (and also a non-trivial performance advantage)
-in order to allow the backend to arbitrarily "reclaim" space used to
-store frontswap pages to more completely manage its memory usage.
-
Note that if a page is stored and the page already exists in transcendent memory
(a "duplicate" store), either the store succeeds and the data is overwritten,
or the store fails AND the page is invalidated. This ensures stale data may
--- a/include/linux/frontswap.h~frontswap-remove-frontswap_writethrough
+++ a/include/linux/frontswap.h
@@ -26,7 +26,6 @@ struct frontswap_ops {
extern void frontswap_register_ops(struct frontswap_ops *ops);
extern void frontswap_shrink(unsigned long);
extern unsigned long frontswap_curr_pages(void);
-extern void frontswap_writethrough(bool);
#define FRONTSWAP_HAS_EXCLUSIVE_GETS
extern void frontswap_tmem_exclusive_gets(bool);
--- a/mm/frontswap.c~frontswap-remove-frontswap_writethrough
+++ a/mm/frontswap.c
@@ -33,16 +33,6 @@ static struct frontswap_ops *frontswap_o
for ((ops) = frontswap_ops; (ops); (ops) = (ops)->next)
/*
- * If enabled, frontswap_store will return failure even on success. As
- * a result, the swap subsystem will always write the page to swap, in
- * effect converting frontswap into a writethrough cache. In this mode,
- * there is no direct reduction in swap writes, but a frontswap backend
- * can unilaterally "reclaim" any pages in use with no data loss, thus
- * providing increases control over maximum memory usage due to frontswap.
- */
-static bool frontswap_writethrough_enabled __read_mostly;
-
-/*
* If enabled, the underlying tmem implementation is capable of doing
* exclusive gets, so frontswap_load, on a successful tmem_get must
* mark the page as no longer in frontswap AND mark it dirty.
@@ -171,15 +161,6 @@ void frontswap_register_ops(struct front
EXPORT_SYMBOL(frontswap_register_ops);
/*
- * Enable/disable frontswap writethrough (see above).
- */
-void frontswap_writethrough(bool enable)
-{
- frontswap_writethrough_enabled = enable;
-}
-EXPORT_SYMBOL(frontswap_writethrough);
-
-/*
* Enable/disable frontswap exclusive gets (see above).
*/
void frontswap_tmem_exclusive_gets(bool enable)
@@ -283,9 +264,7 @@ int __frontswap_store(struct page *page)
} else {
inc_frontswap_failed_stores();
}
- if (frontswap_writethrough_enabled)
- /* report failure so swap also writes to swap device */
- ret = -1;
+
return ret;
}
EXPORT_SYMBOL(__frontswap_store);
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 59/69] frontswap: remove frontswap_tmem_exclusive_gets
2022-01-22 6:10 incoming Andrew Morton
` (57 preceding siblings ...)
2022-01-22 6:14 ` [patch 58/69] frontswap: remove frontswap_writethrough Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:14 ` [patch 60/69] frontswap: remove frontswap_shrink Andrew Morton
` (9 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: akpm, ddstreet, geert, hch, hughd, jgross, Konrad.wilk, linux-mm,
mm-commits, sjenning, torvalds, vitaly.wool, willy
From: Christoph Hellwig <hch@lst.de>
Subject: frontswap: remove frontswap_tmem_exclusive_gets
frontswap_tmem_exclusive_gets is never called, so remove it.
Link: https://lkml.kernel.org/r/20211224062246.1258487-4-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/frontswap.h | 2 --
mm/frontswap.c | 23 +----------------------
2 files changed, 1 insertion(+), 24 deletions(-)
--- a/include/linux/frontswap.h~frontswap-remove-frontswap_tmem_exclusive_gets
+++ a/include/linux/frontswap.h
@@ -26,8 +26,6 @@ struct frontswap_ops {
extern void frontswap_register_ops(struct frontswap_ops *ops);
extern void frontswap_shrink(unsigned long);
extern unsigned long frontswap_curr_pages(void);
-#define FRONTSWAP_HAS_EXCLUSIVE_GETS
-extern void frontswap_tmem_exclusive_gets(bool);
extern bool __frontswap_test(struct swap_info_struct *, pgoff_t);
extern void __frontswap_init(unsigned type, unsigned long *map);
--- a/mm/frontswap.c~frontswap-remove-frontswap_tmem_exclusive_gets
+++ a/mm/frontswap.c
@@ -32,13 +32,6 @@ static struct frontswap_ops *frontswap_o
#define for_each_frontswap_ops(ops) \
for ((ops) = frontswap_ops; (ops); (ops) = (ops)->next)
-/*
- * If enabled, the underlying tmem implementation is capable of doing
- * exclusive gets, so frontswap_load, on a successful tmem_get must
- * mark the page as no longer in frontswap AND mark it dirty.
- */
-static bool frontswap_tmem_exclusive_gets_enabled __read_mostly;
-
#ifdef CONFIG_DEBUG_FS
/*
* Counters available via /sys/kernel/debug/frontswap (if debugfs is
@@ -161,15 +154,6 @@ void frontswap_register_ops(struct front
EXPORT_SYMBOL(frontswap_register_ops);
/*
- * Enable/disable frontswap exclusive gets (see above).
- */
-void frontswap_tmem_exclusive_gets(bool enable)
-{
- frontswap_tmem_exclusive_gets_enabled = enable;
-}
-EXPORT_SYMBOL(frontswap_tmem_exclusive_gets);
-
-/*
* Called when a swap device is swapon'd.
*/
void __frontswap_init(unsigned type, unsigned long *map)
@@ -296,13 +280,8 @@ int __frontswap_load(struct page *page)
if (!ret) /* successful load */
break;
}
- if (ret == 0) {
+ if (ret == 0)
inc_frontswap_loads();
- if (frontswap_tmem_exclusive_gets_enabled) {
- SetPageDirty(page);
- __frontswap_clear(sis, offset);
- }
- }
return ret;
}
EXPORT_SYMBOL(__frontswap_load);
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 60/69] frontswap: remove frontswap_shrink
2022-01-22 6:10 incoming Andrew Morton
` (58 preceding siblings ...)
2022-01-22 6:14 ` [patch 59/69] frontswap: remove frontswap_tmem_exclusive_gets Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:14 ` [patch 61/69] frontswap: remove frontswap_curr_pages Andrew Morton
` (8 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: akpm, ddstreet, geert, hch, hughd, jgross, Konrad.wilk, linux-mm,
mm-commits, sjenning, torvalds, vitaly.wool, willy
From: Christoph Hellwig <hch@lst.de>
Subject: frontswap: remove frontswap_shrink
frontswap_shrink is never called, so remove it.
Link: https://lkml.kernel.org/r/20211224062246.1258487-5-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
Documentation/vm/frontswap.rst | 13 ----
include/linux/frontswap.h | 1
mm/frontswap.c | 83 -------------------------------
3 files changed, 97 deletions(-)
--- a/Documentation/vm/frontswap.rst~frontswap-remove-frontswap_shrink
+++ a/Documentation/vm/frontswap.rst
@@ -255,19 +255,6 @@ the old data and ensure that it is no lo
swap subsystem then writes the new data to the read swap device,
this is the correct course of action to ensure coherency.
-* What is frontswap_shrink for?
-
-When the (non-frontswap) swap subsystem swaps out a page to a real
-swap device, that page is only taking up low-value pre-allocated disk
-space. But if frontswap has placed a page in transcendent memory, that
-page may be taking up valuable real estate. The frontswap_shrink
-routine allows code outside of the swap subsystem to force pages out
-of the memory managed by frontswap and back into kernel-addressable memory.
-For example, in RAMster, a "suction driver" thread will attempt
-to "repatriate" pages sent to a remote machine back to the local machine;
-this is driven using the frontswap_shrink mechanism when memory pressure
-subsides.
-
* Why does the frontswap patch create the new include file swapfile.h?
The frontswap code depends on some swap-subsystem-internal data
--- a/include/linux/frontswap.h~frontswap-remove-frontswap_shrink
+++ a/include/linux/frontswap.h
@@ -24,7 +24,6 @@ struct frontswap_ops {
};
extern void frontswap_register_ops(struct frontswap_ops *ops);
-extern void frontswap_shrink(unsigned long);
extern unsigned long frontswap_curr_pages(void);
extern bool __frontswap_test(struct swap_info_struct *, pgoff_t);
--- a/mm/frontswap.c~frontswap-remove-frontswap_shrink
+++ a/mm/frontswap.c
@@ -341,89 +341,6 @@ static unsigned long __frontswap_curr_pa
return totalpages;
}
-static int __frontswap_unuse_pages(unsigned long total, unsigned long *unused,
- int *swapid)
-{
- int ret = -EINVAL;
- struct swap_info_struct *si = NULL;
- int si_frontswap_pages;
- unsigned long total_pages_to_unuse = total;
- unsigned long pages = 0, pages_to_unuse = 0;
-
- assert_spin_locked(&swap_lock);
- plist_for_each_entry(si, &swap_active_head, list) {
- si_frontswap_pages = atomic_read(&si->frontswap_pages);
- if (total_pages_to_unuse < si_frontswap_pages) {
- pages = pages_to_unuse = total_pages_to_unuse;
- } else {
- pages = si_frontswap_pages;
- pages_to_unuse = 0; /* unuse all */
- }
- /* ensure there is enough RAM to fetch pages from frontswap */
- if (security_vm_enough_memory_mm(current->mm, pages)) {
- ret = -ENOMEM;
- continue;
- }
- vm_unacct_memory(pages);
- *unused = pages_to_unuse;
- *swapid = si->type;
- ret = 0;
- break;
- }
-
- return ret;
-}
-
-/*
- * Used to check if it's necessary and feasible to unuse pages.
- * Return 1 when nothing to do, 0 when need to shrink pages,
- * error code when there is an error.
- */
-static int __frontswap_shrink(unsigned long target_pages,
- unsigned long *pages_to_unuse,
- int *type)
-{
- unsigned long total_pages = 0, total_pages_to_unuse;
-
- assert_spin_locked(&swap_lock);
-
- total_pages = __frontswap_curr_pages();
- if (total_pages <= target_pages) {
- /* Nothing to do */
- *pages_to_unuse = 0;
- return 1;
- }
- total_pages_to_unuse = total_pages - target_pages;
- return __frontswap_unuse_pages(total_pages_to_unuse, pages_to_unuse, type);
-}
-
-/*
- * Frontswap, like a true swap device, may unnecessarily retain pages
- * under certain circumstances; "shrink" frontswap is essentially a
- * "partial swapoff" and works by calling try_to_unuse to attempt to
- * unuse enough frontswap pages to attempt to -- subject to memory
- * constraints -- reduce the number of pages in frontswap to the
- * number given in the parameter target_pages.
- */
-void frontswap_shrink(unsigned long target_pages)
-{
- unsigned long pages_to_unuse = 0;
- int type, ret;
-
- /*
- * we don't want to hold swap_lock while doing a very
- * lengthy try_to_unuse, but swap_list may change
- * so restart scan from swap_active_head each time
- */
- spin_lock(&swap_lock);
- ret = __frontswap_shrink(target_pages, &pages_to_unuse, &type);
- spin_unlock(&swap_lock);
- if (ret == 0)
- try_to_unuse(type, true, pages_to_unuse);
- return;
-}
-EXPORT_SYMBOL(frontswap_shrink);
-
/*
* Count and return the number of frontswap pages across all
* swap devices. This is exported so that backend drivers can
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 61/69] frontswap: remove frontswap_curr_pages
2022-01-22 6:10 incoming Andrew Morton
` (59 preceding siblings ...)
2022-01-22 6:14 ` [patch 60/69] frontswap: remove frontswap_shrink Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:14 ` [patch 62/69] frontswap: simplify frontswap_init Andrew Morton
` (7 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: akpm, ddstreet, geert, hch, hughd, jgross, Konrad.wilk, linux-mm,
mm-commits, sjenning, torvalds, vitaly.wool, willy
From: Christoph Hellwig <hch@lst.de>
Subject: frontswap: remove frontswap_curr_pages
frontswap_curr_pages is never called, so remove it.
Link: https://lkml.kernel.org/r/20211224062246.1258487-6-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/frontswap.h | 1 -
mm/frontswap.c | 28 ----------------------------
2 files changed, 29 deletions(-)
--- a/include/linux/frontswap.h~frontswap-remove-frontswap_curr_pages
+++ a/include/linux/frontswap.h
@@ -24,7 +24,6 @@ struct frontswap_ops {
};
extern void frontswap_register_ops(struct frontswap_ops *ops);
-extern unsigned long frontswap_curr_pages(void);
extern bool __frontswap_test(struct swap_info_struct *, pgoff_t);
extern void __frontswap_init(unsigned type, unsigned long *map);
--- a/mm/frontswap.c~frontswap-remove-frontswap_curr_pages
+++ a/mm/frontswap.c
@@ -330,34 +330,6 @@ void __frontswap_invalidate_area(unsigne
}
EXPORT_SYMBOL(__frontswap_invalidate_area);
-static unsigned long __frontswap_curr_pages(void)
-{
- unsigned long totalpages = 0;
- struct swap_info_struct *si = NULL;
-
- assert_spin_locked(&swap_lock);
- plist_for_each_entry(si, &swap_active_head, list)
- totalpages += atomic_read(&si->frontswap_pages);
- return totalpages;
-}
-
-/*
- * Count and return the number of frontswap pages across all
- * swap devices. This is exported so that backend drivers can
- * determine current usage without reading debugfs.
- */
-unsigned long frontswap_curr_pages(void)
-{
- unsigned long totalpages = 0;
-
- spin_lock(&swap_lock);
- totalpages = __frontswap_curr_pages();
- spin_unlock(&swap_lock);
-
- return totalpages;
-}
-EXPORT_SYMBOL(frontswap_curr_pages);
-
static int __init init_frontswap(void)
{
#ifdef CONFIG_DEBUG_FS
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 62/69] frontswap: simplify frontswap_init
2022-01-22 6:10 incoming Andrew Morton
` (60 preceding siblings ...)
2022-01-22 6:14 ` [patch 61/69] frontswap: remove frontswap_curr_pages Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:14 ` [patch 63/69] frontswap: remove the frontswap exports Andrew Morton
` (6 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: akpm, ddstreet, geert, hch, hughd, jgross, Konrad.wilk, linux-mm,
mm-commits, sjenning, torvalds, vitaly.wool, willy
From: Christoph Hellwig <hch@lst.de>
Subject: frontswap: simplify frontswap_init
Just use IS_ENABLED() and remove the __frontswap_init indirection.
Also remove the unused export.
Link: https://lkml.kernel.org/r/20211224062246.1258487-7-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/frontswap.h | 9 +--------
mm/frontswap.c | 3 +--
mm/swapfile.c | 3 ++-
3 files changed, 4 insertions(+), 11 deletions(-)
--- a/include/linux/frontswap.h~frontswap-simplify-frontswap_init
+++ a/include/linux/frontswap.h
@@ -26,7 +26,7 @@ struct frontswap_ops {
extern void frontswap_register_ops(struct frontswap_ops *ops);
extern bool __frontswap_test(struct swap_info_struct *, pgoff_t);
-extern void __frontswap_init(unsigned type, unsigned long *map);
+extern void frontswap_init(unsigned type, unsigned long *map);
extern int __frontswap_store(struct page *page);
extern int __frontswap_load(struct page *page);
extern void __frontswap_invalidate_page(unsigned, pgoff_t);
@@ -107,11 +107,4 @@ static inline void frontswap_invalidate_
__frontswap_invalidate_area(type);
}
-static inline void frontswap_init(unsigned type, unsigned long *map)
-{
-#ifdef CONFIG_FRONTSWAP
- __frontswap_init(type, map);
-#endif
-}
-
#endif /* _LINUX_FRONTSWAP_H */
--- a/mm/frontswap.c~frontswap-simplify-frontswap_init
+++ a/mm/frontswap.c
@@ -156,7 +156,7 @@ EXPORT_SYMBOL(frontswap_register_ops);
/*
* Called when a swap device is swapon'd.
*/
-void __frontswap_init(unsigned type, unsigned long *map)
+void frontswap_init(unsigned type, unsigned long *map)
{
struct swap_info_struct *sis = swap_info[type];
struct frontswap_ops *ops;
@@ -179,7 +179,6 @@ void __frontswap_init(unsigned type, uns
for_each_frontswap_ops(ops)
ops->init(type);
}
-EXPORT_SYMBOL(__frontswap_init);
bool __frontswap_test(struct swap_info_struct *sis,
pgoff_t offset)
--- a/mm/swapfile.c~frontswap-simplify-frontswap_init
+++ a/mm/swapfile.c
@@ -2463,7 +2463,8 @@ static void enable_swap_info(struct swap
struct swap_cluster_info *cluster_info,
unsigned long *frontswap_map)
{
- frontswap_init(p->type, frontswap_map);
+ if (IS_ENABLED(CONFIG_FRONTSWAP))
+ frontswap_init(p->type, frontswap_map);
spin_lock(&swap_lock);
spin_lock(&p->lock);
setup_swap_info(p, prio, swap_map, cluster_info);
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 63/69] frontswap: remove the frontswap exports
2022-01-22 6:10 incoming Andrew Morton
` (61 preceding siblings ...)
2022-01-22 6:14 ` [patch 62/69] frontswap: simplify frontswap_init Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:14 ` [patch 64/69] mm: simplify try_to_unuse Andrew Morton
` (5 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: akpm, ddstreet, geert, hch, hughd, jgross, Konrad.wilk, linux-mm,
mm-commits, sjenning, torvalds, vitaly.wool, willy
From: Christoph Hellwig <hch@lst.de>
Subject: frontswap: remove the frontswap exports
None of the frontswap API is called from modular code.
Link: https://lkml.kernel.org/r/20211224062246.1258487-8-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/frontswap.c | 6 ------
1 file changed, 6 deletions(-)
--- a/mm/frontswap.c~frontswap-remove-the-frontswap-exports
+++ a/mm/frontswap.c
@@ -151,7 +151,6 @@ void frontswap_register_ops(struct front
}
}
}
-EXPORT_SYMBOL(frontswap_register_ops);
/*
* Called when a swap device is swapon'd.
@@ -187,7 +186,6 @@ bool __frontswap_test(struct swap_info_s
return test_bit(offset, sis->frontswap_map);
return false;
}
-EXPORT_SYMBOL(__frontswap_test);
static inline void __frontswap_set(struct swap_info_struct *sis,
pgoff_t offset)
@@ -250,7 +248,6 @@ int __frontswap_store(struct page *page)
return ret;
}
-EXPORT_SYMBOL(__frontswap_store);
/*
* "Get" data from frontswap associated with swaptype and offset that were
@@ -283,7 +280,6 @@ int __frontswap_load(struct page *page)
inc_frontswap_loads();
return ret;
}
-EXPORT_SYMBOL(__frontswap_load);
/*
* Invalidate any data from frontswap associated with the specified swaptype
@@ -305,7 +301,6 @@ void __frontswap_invalidate_page(unsigne
__frontswap_clear(sis, offset);
inc_frontswap_invalidates();
}
-EXPORT_SYMBOL(__frontswap_invalidate_page);
/*
* Invalidate all data from frontswap associated with all offsets for the
@@ -327,7 +322,6 @@ void __frontswap_invalidate_area(unsigne
atomic_set(&sis->frontswap_pages, 0);
bitmap_zero(sis->frontswap_map, sis->max);
}
-EXPORT_SYMBOL(__frontswap_invalidate_area);
static int __init init_frontswap(void)
{
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 64/69] mm: simplify try_to_unuse
2022-01-22 6:10 incoming Andrew Morton
` (62 preceding siblings ...)
2022-01-22 6:14 ` [patch 63/69] frontswap: remove the frontswap exports Andrew Morton
@ 2022-01-22 6:14 ` Andrew Morton
2022-01-22 6:15 ` [patch 65/69] frontswap: remove frontswap_test Andrew Morton
` (4 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:14 UTC (permalink / raw)
To: akpm, ddstreet, geert, hch, hughd, jgross, Konrad.wilk, linux-mm,
mm-commits, naresh.kamboju, sjenning, torvalds, vitaly.wool,
willy
From: Christoph Hellwig <hch@lst.de>
Subject: mm: simplify try_to_unuse
Remove the unused frontswap and pages_to_unuse arguments, and mark
the function static now that the caller in frontswap is gone.
[akpm@linux-foundation.org: fix shmem_unuse() stub, per Matthew]
Link: https://lkml.kernel.org/r/20211224062246.1258487-9-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Cc: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/frontswap.h | 7 ---
include/linux/shmem_fs.h | 3 -
include/linux/swapfile.h | 1
mm/shmem.c | 33 ++------------
mm/swapfile.c | 83 +++++++++---------------------------
5 files changed, 30 insertions(+), 97 deletions(-)
--- a/include/linux/frontswap.h~mm-simplify-try_to_unuse
+++ a/include/linux/frontswap.h
@@ -7,13 +7,6 @@
#include <linux/bitops.h>
#include <linux/jump_label.h>
-/*
- * Return code to denote that requested number of
- * frontswap pages are unused(moved to page cache).
- * Used in shmem_unuse and try_to_unuse.
- */
-#define FRONTSWAP_PAGES_UNUSED 2
-
struct frontswap_ops {
void (*init)(unsigned); /* this swap type was just swapon'ed */
int (*store)(unsigned, pgoff_t, struct page *); /* store a page */
--- a/include/linux/shmem_fs.h~mm-simplify-try_to_unuse
+++ a/include/linux/shmem_fs.h
@@ -83,8 +83,7 @@ extern void shmem_unlock_mapping(struct
extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
pgoff_t index, gfp_t gfp_mask);
extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end);
-extern int shmem_unuse(unsigned int type, bool frontswap,
- unsigned long *fs_pages_to_unuse);
+int shmem_unuse(unsigned int type);
extern bool shmem_is_huge(struct vm_area_struct *vma,
struct inode *inode, pgoff_t index);
--- a/include/linux/swapfile.h~mm-simplify-try_to_unuse
+++ a/include/linux/swapfile.h
@@ -9,7 +9,6 @@
extern spinlock_t swap_lock;
extern struct plist_head swap_active_head;
extern struct swap_info_struct *swap_info[];
-extern int try_to_unuse(unsigned int, bool, unsigned long);
extern unsigned long generic_max_swapfile_size(void);
extern unsigned long max_swapfile_size(void);
--- a/mm/shmem.c~mm-simplify-try_to_unuse
+++ a/mm/shmem.c
@@ -36,7 +36,6 @@
#include <linux/uio.h>
#include <linux/khugepaged.h>
#include <linux/hugetlb.h>
-#include <linux/frontswap.h>
#include <linux/fs_parser.h>
#include <linux/swapfile.h>
@@ -1152,7 +1151,7 @@ static void shmem_evict_inode(struct ino
static int shmem_find_swap_entries(struct address_space *mapping,
pgoff_t start, unsigned int nr_entries,
struct page **entries, pgoff_t *indices,
- unsigned int type, bool frontswap)
+ unsigned int type)
{
XA_STATE(xas, &mapping->i_pages, start);
struct page *page;
@@ -1173,9 +1172,6 @@ static int shmem_find_swap_entries(struc
entry = radix_to_swp_entry(page);
if (swp_type(entry) != type)
continue;
- if (frontswap &&
- !frontswap_test(swap_info[type], swp_offset(entry)))
- continue;
indices[ret] = xas.xa_index;
entries[ret] = page;
@@ -1228,26 +1224,20 @@ static int shmem_unuse_swap_entries(stru
/*
* If swap found in inode, free it and move page from swapcache to filecache.
*/
-static int shmem_unuse_inode(struct inode *inode, unsigned int type,
- bool frontswap, unsigned long *fs_pages_to_unuse)
+static int shmem_unuse_inode(struct inode *inode, unsigned int type)
{
struct address_space *mapping = inode->i_mapping;
pgoff_t start = 0;
struct pagevec pvec;
pgoff_t indices[PAGEVEC_SIZE];
- bool frontswap_partial = (frontswap && *fs_pages_to_unuse > 0);
int ret = 0;
pagevec_init(&pvec);
do {
unsigned int nr_entries = PAGEVEC_SIZE;
- if (frontswap_partial && *fs_pages_to_unuse < PAGEVEC_SIZE)
- nr_entries = *fs_pages_to_unuse;
-
pvec.nr = shmem_find_swap_entries(mapping, start, nr_entries,
- pvec.pages, indices,
- type, frontswap);
+ pvec.pages, indices, type);
if (pvec.nr == 0) {
ret = 0;
break;
@@ -1257,14 +1247,6 @@ static int shmem_unuse_inode(struct inod
if (ret < 0)
break;
- if (frontswap_partial) {
- *fs_pages_to_unuse -= ret;
- if (*fs_pages_to_unuse == 0) {
- ret = FRONTSWAP_PAGES_UNUSED;
- break;
- }
- }
-
start = indices[pvec.nr - 1];
} while (true);
@@ -1276,8 +1258,7 @@ static int shmem_unuse_inode(struct inod
* device 'type' back into memory, so the swap device can be
* unused.
*/
-int shmem_unuse(unsigned int type, bool frontswap,
- unsigned long *fs_pages_to_unuse)
+int shmem_unuse(unsigned int type)
{
struct shmem_inode_info *info, *next;
int error = 0;
@@ -1300,8 +1281,7 @@ int shmem_unuse(unsigned int type, bool
atomic_inc(&info->stop_eviction);
mutex_unlock(&shmem_swaplist_mutex);
- error = shmem_unuse_inode(&info->vfs_inode, type, frontswap,
- fs_pages_to_unuse);
+ error = shmem_unuse_inode(&info->vfs_inode, type);
cond_resched();
mutex_lock(&shmem_swaplist_mutex);
@@ -4015,8 +3995,7 @@ int __init shmem_init(void)
return 0;
}
-int shmem_unuse(unsigned int type, bool frontswap,
- unsigned long *fs_pages_to_unuse)
+int shmem_unuse(unsigned int type)
{
return 0;
}
--- a/mm/swapfile.c~mm-simplify-try_to_unuse
+++ a/mm/swapfile.c
@@ -1923,8 +1923,7 @@ out:
static int unuse_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long end,
- unsigned int type, bool frontswap,
- unsigned long *fs_pages_to_unuse)
+ unsigned int type)
{
struct page *page;
swp_entry_t entry;
@@ -1945,9 +1944,6 @@ static int unuse_pte_range(struct vm_are
continue;
offset = swp_offset(entry);
- if (frontswap && !frontswap_test(si, offset))
- continue;
-
pte_unmap(pte);
swap_map = &si->swap_map[offset];
page = lookup_swap_cache(entry, vma, addr);
@@ -1979,11 +1975,6 @@ static int unuse_pte_range(struct vm_are
try_to_free_swap(page);
unlock_page(page);
put_page(page);
-
- if (*fs_pages_to_unuse && !--(*fs_pages_to_unuse)) {
- ret = FRONTSWAP_PAGES_UNUSED;
- goto out;
- }
try_next:
pte = pte_offset_map(pmd, addr);
} while (pte++, addr += PAGE_SIZE, addr != end);
@@ -1996,8 +1987,7 @@ out:
static inline int unuse_pmd_range(struct vm_area_struct *vma, pud_t *pud,
unsigned long addr, unsigned long end,
- unsigned int type, bool frontswap,
- unsigned long *fs_pages_to_unuse)
+ unsigned int type)
{
pmd_t *pmd;
unsigned long next;
@@ -2009,8 +1999,7 @@ static inline int unuse_pmd_range(struct
next = pmd_addr_end(addr, end);
if (pmd_none_or_trans_huge_or_clear_bad(pmd))
continue;
- ret = unuse_pte_range(vma, pmd, addr, next, type,
- frontswap, fs_pages_to_unuse);
+ ret = unuse_pte_range(vma, pmd, addr, next, type);
if (ret)
return ret;
} while (pmd++, addr = next, addr != end);
@@ -2019,8 +2008,7 @@ static inline int unuse_pmd_range(struct
static inline int unuse_pud_range(struct vm_area_struct *vma, p4d_t *p4d,
unsigned long addr, unsigned long end,
- unsigned int type, bool frontswap,
- unsigned long *fs_pages_to_unuse)
+ unsigned int type)
{
pud_t *pud;
unsigned long next;
@@ -2031,8 +2019,7 @@ static inline int unuse_pud_range(struct
next = pud_addr_end(addr, end);
if (pud_none_or_clear_bad(pud))
continue;
- ret = unuse_pmd_range(vma, pud, addr, next, type,
- frontswap, fs_pages_to_unuse);
+ ret = unuse_pmd_range(vma, pud, addr, next, type);
if (ret)
return ret;
} while (pud++, addr = next, addr != end);
@@ -2041,8 +2028,7 @@ static inline int unuse_pud_range(struct
static inline int unuse_p4d_range(struct vm_area_struct *vma, pgd_t *pgd,
unsigned long addr, unsigned long end,
- unsigned int type, bool frontswap,
- unsigned long *fs_pages_to_unuse)
+ unsigned int type)
{
p4d_t *p4d;
unsigned long next;
@@ -2053,16 +2039,14 @@ static inline int unuse_p4d_range(struct
next = p4d_addr_end(addr, end);
if (p4d_none_or_clear_bad(p4d))
continue;
- ret = unuse_pud_range(vma, p4d, addr, next, type,
- frontswap, fs_pages_to_unuse);
+ ret = unuse_pud_range(vma, p4d, addr, next, type);
if (ret)
return ret;
} while (p4d++, addr = next, addr != end);
return 0;
}
-static int unuse_vma(struct vm_area_struct *vma, unsigned int type,
- bool frontswap, unsigned long *fs_pages_to_unuse)
+static int unuse_vma(struct vm_area_struct *vma, unsigned int type)
{
pgd_t *pgd;
unsigned long addr, end, next;
@@ -2076,16 +2060,14 @@ static int unuse_vma(struct vm_area_stru
next = pgd_addr_end(addr, end);
if (pgd_none_or_clear_bad(pgd))
continue;
- ret = unuse_p4d_range(vma, pgd, addr, next, type,
- frontswap, fs_pages_to_unuse);
+ ret = unuse_p4d_range(vma, pgd, addr, next, type);
if (ret)
return ret;
} while (pgd++, addr = next, addr != end);
return 0;
}
-static int unuse_mm(struct mm_struct *mm, unsigned int type,
- bool frontswap, unsigned long *fs_pages_to_unuse)
+static int unuse_mm(struct mm_struct *mm, unsigned int type)
{
struct vm_area_struct *vma;
int ret = 0;
@@ -2093,8 +2075,7 @@ static int unuse_mm(struct mm_struct *mm
mmap_read_lock(mm);
for (vma = mm->mmap; vma; vma = vma->vm_next) {
if (vma->anon_vma) {
- ret = unuse_vma(vma, type, frontswap,
- fs_pages_to_unuse);
+ ret = unuse_vma(vma, type);
if (ret)
break;
}
@@ -2110,7 +2091,7 @@ static int unuse_mm(struct mm_struct *mm
* if there are no inuse entries after prev till end of the map.
*/
static unsigned int find_next_to_unuse(struct swap_info_struct *si,
- unsigned int prev, bool frontswap)
+ unsigned int prev)
{
unsigned int i;
unsigned char count;
@@ -2124,8 +2105,7 @@ static unsigned int find_next_to_unuse(s
for (i = prev + 1; i < si->max; i++) {
count = READ_ONCE(si->swap_map[i]);
if (count && swap_count(count) != SWAP_MAP_BAD)
- if (!frontswap || frontswap_test(si, i))
- break;
+ break;
if ((i % LATENCY_LIMIT) == 0)
cond_resched();
}
@@ -2136,12 +2116,7 @@ static unsigned int find_next_to_unuse(s
return i;
}
-/*
- * If the boolean frontswap is true, only unuse pages_to_unuse pages;
- * pages_to_unuse==0 means all pages; ignored if frontswap is false
- */
-int try_to_unuse(unsigned int type, bool frontswap,
- unsigned long pages_to_unuse)
+static int try_to_unuse(unsigned int type)
{
struct mm_struct *prev_mm;
struct mm_struct *mm;
@@ -2155,13 +2130,10 @@ int try_to_unuse(unsigned int type, bool
if (!READ_ONCE(si->inuse_pages))
return 0;
- if (!frontswap)
- pages_to_unuse = 0;
-
retry:
- retval = shmem_unuse(type, frontswap, &pages_to_unuse);
+ retval = shmem_unuse(type);
if (retval)
- goto out;
+ return retval;
prev_mm = &init_mm;
mmget(prev_mm);
@@ -2178,11 +2150,10 @@ retry:
spin_unlock(&mmlist_lock);
mmput(prev_mm);
prev_mm = mm;
- retval = unuse_mm(mm, type, frontswap, &pages_to_unuse);
-
+ retval = unuse_mm(mm, type);
if (retval) {
mmput(prev_mm);
- goto out;
+ return retval;
}
/*
@@ -2199,7 +2170,7 @@ retry:
i = 0;
while (READ_ONCE(si->inuse_pages) &&
!signal_pending(current) &&
- (i = find_next_to_unuse(si, i, frontswap)) != 0) {
+ (i = find_next_to_unuse(si, i)) != 0) {
entry = swp_entry(type, i);
page = find_get_page(swap_address_space(entry), i);
@@ -2217,14 +2188,6 @@ retry:
try_to_free_swap(page);
unlock_page(page);
put_page(page);
-
- /*
- * For frontswap, we just need to unuse pages_to_unuse, if
- * it was specified. Need not check frontswap again here as
- * we already zeroed out pages_to_unuse if not frontswap.
- */
- if (pages_to_unuse && --pages_to_unuse == 0)
- goto out;
}
/*
@@ -2242,10 +2205,10 @@ retry:
if (READ_ONCE(si->inuse_pages)) {
if (!signal_pending(current))
goto retry;
- retval = -EINTR;
+ return -EINTR;
}
-out:
- return (retval == FRONTSWAP_PAGES_UNUSED) ? 0 : retval;
+
+ return 0;
}
/*
@@ -2577,7 +2540,7 @@ SYSCALL_DEFINE1(swapoff, const char __us
disable_swap_slots_cache_lock();
set_current_oom_origin();
- err = try_to_unuse(p->type, false, 0); /* force unuse all pages */
+ err = try_to_unuse(p->type);
clear_current_oom_origin();
if (err) {
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 65/69] frontswap: remove frontswap_test
2022-01-22 6:10 incoming Andrew Morton
` (63 preceding siblings ...)
2022-01-22 6:14 ` [patch 64/69] mm: simplify try_to_unuse Andrew Morton
@ 2022-01-22 6:15 ` Andrew Morton
2022-01-22 6:15 ` [patch 66/69] frontswap: simplify frontswap_register_ops Andrew Morton
` (3 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:15 UTC (permalink / raw)
To: akpm, ddstreet, geert, hch, hughd, jgross, Konrad.wilk, linux-mm,
mm-commits, sjenning, torvalds, vitaly.wool, willy
From: Christoph Hellwig <hch@lst.de>
Subject: frontswap: remove frontswap_test
frontswap_test is unused now, remove it.
Link: https://lkml.kernel.org/r/20211224062246.1258487-10-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/frontswap.h | 11 -----------
mm/frontswap.c | 2 +-
2 files changed, 1 insertion(+), 12 deletions(-)
--- a/include/linux/frontswap.h~frontswap-remove-frontswap_test
+++ a/include/linux/frontswap.h
@@ -18,7 +18,6 @@ struct frontswap_ops {
extern void frontswap_register_ops(struct frontswap_ops *ops);
-extern bool __frontswap_test(struct swap_info_struct *, pgoff_t);
extern void frontswap_init(unsigned type, unsigned long *map);
extern int __frontswap_store(struct page *page);
extern int __frontswap_load(struct page *page);
@@ -33,11 +32,6 @@ static inline bool frontswap_enabled(voi
return static_branch_unlikely(&frontswap_enabled_key);
}
-static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset)
-{
- return __frontswap_test(sis, offset);
-}
-
static inline void frontswap_map_set(struct swap_info_struct *p,
unsigned long *map)
{
@@ -55,11 +49,6 @@ static inline bool frontswap_enabled(voi
{
return false;
}
-
-static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset)
-{
- return false;
-}
static inline void frontswap_map_set(struct swap_info_struct *p,
unsigned long *map)
--- a/mm/frontswap.c~frontswap-remove-frontswap_test
+++ a/mm/frontswap.c
@@ -179,7 +179,7 @@ void frontswap_init(unsigned type, unsig
ops->init(type);
}
-bool __frontswap_test(struct swap_info_struct *sis,
+static bool __frontswap_test(struct swap_info_struct *sis,
pgoff_t offset)
{
if (sis->frontswap_map)
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 66/69] frontswap: simplify frontswap_register_ops
2022-01-22 6:10 incoming Andrew Morton
` (64 preceding siblings ...)
2022-01-22 6:15 ` [patch 65/69] frontswap: remove frontswap_test Andrew Morton
@ 2022-01-22 6:15 ` Andrew Morton
2022-01-22 6:15 ` [patch 67/69] mm: mark swap_lock and swap_active_head static Andrew Morton
` (2 subsequent siblings)
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:15 UTC (permalink / raw)
To: akpm, ddstreet, geert, hch, hughd, jgross, Konrad.wilk, linux-mm,
mm-commits, sjenning, torvalds, vitaly.wool, willy
From: Christoph Hellwig <hch@lst.de>
Subject: frontswap: simplify frontswap_register_ops
Given that frontswap_register_ops must be called from built-in code,
there is no need to handle the case of swapfiles coming online before
or during it, so delete the code that deals with that case.
Link: https://lkml.kernel.org/r/20211224062246.1258487-11-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/frontswap.c | 41 -----------------------------------------
1 file changed, 41 deletions(-)
--- a/mm/frontswap.c~frontswap-simplify-frontswap_register_ops
+++ a/mm/frontswap.c
@@ -99,25 +99,6 @@ static inline void inc_frontswap_invalid
*/
void frontswap_register_ops(struct frontswap_ops *ops)
{
- DECLARE_BITMAP(a, MAX_SWAPFILES);
- DECLARE_BITMAP(b, MAX_SWAPFILES);
- struct swap_info_struct *si;
- unsigned int i;
-
- bitmap_zero(a, MAX_SWAPFILES);
- bitmap_zero(b, MAX_SWAPFILES);
-
- spin_lock(&swap_lock);
- plist_for_each_entry(si, &swap_active_head, list) {
- if (!WARN_ON(!si->frontswap_map))
- __set_bit(si->type, a);
- }
- spin_unlock(&swap_lock);
-
- /* the new ops needs to know the currently active swap devices */
- for_each_set_bit(i, a, MAX_SWAPFILES)
- ops->init(i);
-
/*
* Setting frontswap_ops must happen after the ops->init() calls
* above; cmpxchg implies smp_mb() which will ensure the init is
@@ -128,28 +109,6 @@ void frontswap_register_ops(struct front
} while (cmpxchg(&frontswap_ops, ops->next, ops) != ops->next);
static_branch_inc(&frontswap_enabled_key);
-
- spin_lock(&swap_lock);
- plist_for_each_entry(si, &swap_active_head, list) {
- if (si->frontswap_map)
- __set_bit(si->type, b);
- }
- spin_unlock(&swap_lock);
-
- /*
- * On the very unlikely chance that a swap device was added or
- * removed between setting the "a" list bits and the ops init
- * calls, we re-check and do init or invalidate for any changed
- * bits.
- */
- if (unlikely(!bitmap_equal(a, b, MAX_SWAPFILES))) {
- for (i = 0; i < MAX_SWAPFILES; i++) {
- if (!test_bit(i, a) && test_bit(i, b))
- ops->init(i);
- else if (test_bit(i, a) && !test_bit(i, b))
- ops->invalidate_area(i);
- }
- }
}
/*
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 67/69] mm: mark swap_lock and swap_active_head static
2022-01-22 6:10 incoming Andrew Morton
` (65 preceding siblings ...)
2022-01-22 6:15 ` [patch 66/69] frontswap: simplify frontswap_register_ops Andrew Morton
@ 2022-01-22 6:15 ` Andrew Morton
2022-01-22 6:15 ` [patch 68/69] frontswap: remove support for multiple ops Andrew Morton
2022-01-22 6:15 ` [patch 69/69] mm: hide the FRONTSWAP Kconfig symbol Andrew Morton
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:15 UTC (permalink / raw)
To: akpm, ddstreet, geert, hch, hughd, jgross, Konrad.wilk, linux-mm,
mm-commits, sjenning, torvalds, vitaly.wool, willy
From: Christoph Hellwig <hch@lst.de>
Subject: mm: mark swap_lock and swap_active_head static
swap_lock and swap_active_head are only used in swapfile.c, so mark them
static.
Link: https://lkml.kernel.org/r/20211224062246.1258487-12-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/swapfile.h | 2 --
mm/swapfile.c | 4 ++--
2 files changed, 2 insertions(+), 4 deletions(-)
--- a/include/linux/swapfile.h~mm-mark-swap_lock-and-swap_active_head-static
+++ a/include/linux/swapfile.h
@@ -6,8 +6,6 @@
* these were static in swapfile.c but frontswap.c needs them and we don't
* want to expose them to the dozens of source files that include swap.h
*/
-extern spinlock_t swap_lock;
-extern struct plist_head swap_active_head;
extern struct swap_info_struct *swap_info[];
extern unsigned long generic_max_swapfile_size(void);
extern unsigned long max_swapfile_size(void);
--- a/mm/swapfile.c~mm-mark-swap_lock-and-swap_active_head-static
+++ a/mm/swapfile.c
@@ -49,7 +49,7 @@ static bool swap_count_continued(struct
unsigned char);
static void free_swap_count_continuations(struct swap_info_struct *);
-DEFINE_SPINLOCK(swap_lock);
+static DEFINE_SPINLOCK(swap_lock);
static unsigned int nr_swapfiles;
atomic_long_t nr_swap_pages;
/*
@@ -71,7 +71,7 @@ static const char Unused_offset[] = "Unu
* all active swap_info_structs
* protected with swap_lock, and ordered by priority.
*/
-PLIST_HEAD(swap_active_head);
+static PLIST_HEAD(swap_active_head);
/*
* all available (active, not full) swap_info_structs
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 68/69] frontswap: remove support for multiple ops
2022-01-22 6:10 incoming Andrew Morton
` (66 preceding siblings ...)
2022-01-22 6:15 ` [patch 67/69] mm: mark swap_lock and swap_active_head static Andrew Morton
@ 2022-01-22 6:15 ` Andrew Morton
2022-01-22 6:15 ` [patch 69/69] mm: hide the FRONTSWAP Kconfig symbol Andrew Morton
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:15 UTC (permalink / raw)
To: akpm, ddstreet, geert, hch, hughd, jgross, Konrad.wilk, linux-mm,
mm-commits, sjenning, torvalds, vitaly.wool, willy
From: Christoph Hellwig <hch@lst.de>
Subject: frontswap: remove support for multiple ops
There is only a single instance of frontswap ops in the kernel, so
simplify the frontswap code by removing support for multiple operations.
Link: https://lkml.kernel.org/r/20211224062246.1258487-13-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/frontswap.h | 3 --
mm/frontswap.c | 50 ++++++++----------------------------
mm/zswap.c | 8 ++++-
3 files changed, 19 insertions(+), 42 deletions(-)
--- a/include/linux/frontswap.h~frontswap-remove-support-for-multiple-ops
+++ a/include/linux/frontswap.h
@@ -13,10 +13,9 @@ struct frontswap_ops {
int (*load)(unsigned, pgoff_t, struct page *); /* load a page */
void (*invalidate_page)(unsigned, pgoff_t); /* page no longer needed */
void (*invalidate_area)(unsigned); /* swap type just swapoff'ed */
- struct frontswap_ops *next; /* private pointer to next ops */
};
-extern void frontswap_register_ops(struct frontswap_ops *ops);
+int frontswap_register_ops(const struct frontswap_ops *ops);
extern void frontswap_init(unsigned type, unsigned long *map);
extern int __frontswap_store(struct page *page);
--- a/mm/frontswap.c~frontswap-remove-support-for-multiple-ops
+++ a/mm/frontswap.c
@@ -27,10 +27,7 @@ DEFINE_STATIC_KEY_FALSE(frontswap_enable
* may be registered, but implementations can never deregister. This
* is a simple singly-linked list of all registered implementations.
*/
-static struct frontswap_ops *frontswap_ops __read_mostly;
-
-#define for_each_frontswap_ops(ops) \
- for ((ops) = frontswap_ops; (ops); (ops) = (ops)->next)
+static const struct frontswap_ops *frontswap_ops __read_mostly;
#ifdef CONFIG_DEBUG_FS
/*
@@ -97,18 +94,14 @@ static inline void inc_frontswap_invalid
/*
* Register operations for frontswap
*/
-void frontswap_register_ops(struct frontswap_ops *ops)
+int frontswap_register_ops(const struct frontswap_ops *ops)
{
- /*
- * Setting frontswap_ops must happen after the ops->init() calls
- * above; cmpxchg implies smp_mb() which will ensure the init is
- * complete at this point.
- */
- do {
- ops->next = frontswap_ops;
- } while (cmpxchg(&frontswap_ops, ops->next, ops) != ops->next);
+ if (frontswap_ops)
+ return -EINVAL;
+ frontswap_ops = ops;
static_branch_inc(&frontswap_enabled_key);
+ return 0;
}
/*
@@ -117,7 +110,6 @@ void frontswap_register_ops(struct front
void frontswap_init(unsigned type, unsigned long *map)
{
struct swap_info_struct *sis = swap_info[type];
- struct frontswap_ops *ops;
VM_BUG_ON(sis == NULL);
@@ -133,9 +125,7 @@ void frontswap_init(unsigned type, unsig
* p->frontswap set to something valid to work properly.
*/
frontswap_map_set(sis, map);
-
- for_each_frontswap_ops(ops)
- ops->init(type);
+ frontswap_ops->init(type);
}
static bool __frontswap_test(struct swap_info_struct *sis,
@@ -174,7 +164,6 @@ int __frontswap_store(struct page *page)
int type = swp_type(entry);
struct swap_info_struct *sis = swap_info[type];
pgoff_t offset = swp_offset(entry);
- struct frontswap_ops *ops;
VM_BUG_ON(!frontswap_ops);
VM_BUG_ON(!PageLocked(page));
@@ -188,16 +177,10 @@ int __frontswap_store(struct page *page)
*/
if (__frontswap_test(sis, offset)) {
__frontswap_clear(sis, offset);
- for_each_frontswap_ops(ops)
- ops->invalidate_page(type, offset);
+ frontswap_ops->invalidate_page(type, offset);
}
- /* Try to store in each implementation, until one succeeds. */
- for_each_frontswap_ops(ops) {
- ret = ops->store(type, offset, page);
- if (!ret) /* successful store */
- break;
- }
+ ret = frontswap_ops->store(type, offset, page);
if (ret == 0) {
__frontswap_set(sis, offset);
inc_frontswap_succ_stores();
@@ -220,7 +203,6 @@ int __frontswap_load(struct page *page)
int type = swp_type(entry);
struct swap_info_struct *sis = swap_info[type];
pgoff_t offset = swp_offset(entry);
- struct frontswap_ops *ops;
VM_BUG_ON(!frontswap_ops);
VM_BUG_ON(!PageLocked(page));
@@ -230,11 +212,7 @@ int __frontswap_load(struct page *page)
return -1;
/* Try loading from each implementation, until one succeeds. */
- for_each_frontswap_ops(ops) {
- ret = ops->load(type, offset, page);
- if (!ret) /* successful load */
- break;
- }
+ ret = frontswap_ops->load(type, offset, page);
if (ret == 0)
inc_frontswap_loads();
return ret;
@@ -247,7 +225,6 @@ int __frontswap_load(struct page *page)
void __frontswap_invalidate_page(unsigned type, pgoff_t offset)
{
struct swap_info_struct *sis = swap_info[type];
- struct frontswap_ops *ops;
VM_BUG_ON(!frontswap_ops);
VM_BUG_ON(sis == NULL);
@@ -255,8 +232,7 @@ void __frontswap_invalidate_page(unsigne
if (!__frontswap_test(sis, offset))
return;
- for_each_frontswap_ops(ops)
- ops->invalidate_page(type, offset);
+ frontswap_ops->invalidate_page(type, offset);
__frontswap_clear(sis, offset);
inc_frontswap_invalidates();
}
@@ -268,7 +244,6 @@ void __frontswap_invalidate_page(unsigne
void __frontswap_invalidate_area(unsigned type)
{
struct swap_info_struct *sis = swap_info[type];
- struct frontswap_ops *ops;
VM_BUG_ON(!frontswap_ops);
VM_BUG_ON(sis == NULL);
@@ -276,8 +251,7 @@ void __frontswap_invalidate_area(unsigne
if (sis->frontswap_map == NULL)
return;
- for_each_frontswap_ops(ops)
- ops->invalidate_area(type);
+ frontswap_ops->invalidate_area(type);
atomic_set(&sis->frontswap_pages, 0);
bitmap_zero(sis->frontswap_map, sis->max);
}
--- a/mm/zswap.c~frontswap-remove-support-for-multiple-ops
+++ a/mm/zswap.c
@@ -1378,7 +1378,7 @@ static void zswap_frontswap_init(unsigne
zswap_trees[type] = tree;
}
-static struct frontswap_ops zswap_frontswap_ops = {
+static const struct frontswap_ops zswap_frontswap_ops = {
.store = zswap_frontswap_store,
.load = zswap_frontswap_load,
.invalidate_page = zswap_frontswap_invalidate_page,
@@ -1475,11 +1475,15 @@ static int __init init_zswap(void)
if (!shrink_wq)
goto fallback_fail;
- frontswap_register_ops(&zswap_frontswap_ops);
+ ret = frontswap_register_ops(&zswap_frontswap_ops);
+ if (ret)
+ goto destroy_wq;
if (zswap_debugfs_init())
pr_warn("debugfs initialization failed\n");
return 0;
+destroy_wq:
+ destroy_workqueue(shrink_wq);
fallback_fail:
if (pool)
zswap_pool_destroy(pool);
_
^ permalink raw reply [flat|nested] 83+ messages in thread* [patch 69/69] mm: hide the FRONTSWAP Kconfig symbol
2022-01-22 6:10 incoming Andrew Morton
` (67 preceding siblings ...)
2022-01-22 6:15 ` [patch 68/69] frontswap: remove support for multiple ops Andrew Morton
@ 2022-01-22 6:15 ` Andrew Morton
68 siblings, 0 replies; 83+ messages in thread
From: Andrew Morton @ 2022-01-22 6:15 UTC (permalink / raw)
To: akpm, ddstreet, geert, hch, hughd, jgross, Konrad.wilk, linux-mm,
mm-commits, sjenning, torvalds, vitaly.wool, willy
From: Christoph Hellwig <hch@lst.de>
Subject: mm: hide the FRONTSWAP Kconfig symbol
Select FRONTSWAP from ZSWAP instead of prompting for it.
Link: https://lkml.kernel.org/r/20211224062246.1258487-14-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/Kconfig | 18 +++---------------
1 file changed, 3 insertions(+), 15 deletions(-)
--- a/mm/Kconfig~mm-hide-the-frontswap-kconfig-symbol
+++ a/mm/Kconfig
@@ -445,20 +445,7 @@ config HAVE_SETUP_PER_CPU_AREA
bool
config FRONTSWAP
- bool "Enable frontswap to cache swap pages if tmem is present"
- depends on SWAP
- help
- Frontswap is so named because it can be thought of as the opposite
- of a "backing" store for a swap device. The data is stored into
- "transcendent memory", memory that is not directly accessible or
- addressable by the kernel and is of unknown and possibly
- time-varying size. When space in transcendent memory is available,
- a significant swap I/O reduction may be achieved. When none is
- available, all frontswap calls are reduced to a single pointer-
- compare-against-NULL resulting in a negligible performance hit
- and swap data is stored as normal on the matching swap device.
-
- If unsure, say Y to enable frontswap.
+ bool
config CMA
bool "Contiguous Memory Allocator"
@@ -523,7 +510,8 @@ config MEM_SOFT_DIRTY
config ZSWAP
bool "Compressed cache for swap pages (EXPERIMENTAL)"
- depends on FRONTSWAP && CRYPTO=y
+ depends on SWAP && CRYPTO=y
+ select FRONTSWAP
select ZPOOL
help
A lightweight compressed cache for swap pages. It takes
_
^ permalink raw reply [flat|nested] 83+ messages in thread