* + mm-vmalloc-convert-vread-to-vread_iter.patch added to mm-unstable branch
@ 2023-03-19 20:10 Andrew Morton
0 siblings, 0 replies; 3+ messages in thread
From: Andrew Morton @ 2023-03-19 20:10 UTC (permalink / raw)
To: mm-commits, willy, urezki, liushixin2, jolsa, david, bhe, lstoakes, akpm
The patch titled
Subject: mm: vmalloc: convert vread() to vread_iter()
has been added to the -mm mm-unstable branch. Its filename is
mm-vmalloc-convert-vread-to-vread_iter.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmalloc-convert-vread-to-vread_iter.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Lorenzo Stoakes <lstoakes@gmail.com>
Subject: mm: vmalloc: convert vread() to vread_iter()
Date: Sun, 19 Mar 2023 07:09:33 +0000
Having previously laid the foundation for converting vread() to an
iterator function, pull the trigger and do so.
This patch attempts to provide minimal refactoring and to reflect the
existing logic as best we can, with the exception of aligned_vread_iter()
which drops the use of the deprecated kmap_atomic() in favour of
kmap_local_page().
All existing logic to zero portions of memory not read remain and there
should be no functional difference other than a performance improvement in
/proc/kcore access to vmalloc regions.
Now we have discarded with the need for a bounce buffer at all in
read_kcore_iter(), we dispense with the one allocated there altogether.
Link: https://lkml.kernel.org/r/7f9dad4deade9639cf7af7a8b01143bca882ff02.1679209395.git.lstoakes@gmail.com
Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Liu Shixin <liushixin2@huawei.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
--- a/fs/proc/kcore.c~mm-vmalloc-convert-vread-to-vread_iter
+++ a/fs/proc/kcore.c
@@ -307,13 +307,9 @@ static void append_kcore_note(char *note
*i = ALIGN(*i + descsz, 4);
}
-static ssize_t
-read_kcore_iter(struct kiocb *iocb, struct iov_iter *iter)
+static ssize_t read_kcore_iter(struct kiocb *iocb, struct iov_iter *iter)
{
- struct file *file = iocb->ki_filp;
- char *buf = file->private_data;
loff_t *ppos = &iocb->ki_pos;
-
size_t phdrs_offset, notes_offset, data_offset;
size_t page_offline_frozen = 1;
size_t phdrs_len, notes_len;
@@ -507,9 +503,7 @@ read_kcore_iter(struct kiocb *iocb, stru
switch (m->type) {
case KCORE_VMALLOC:
- vread(buf, (char *)start, tsz);
- /* we have to zero-fill user buffer even if no read */
- if (copy_to_iter(buf, tsz, iter) != tsz) {
+ if (vread_iter(iter, (char *)start, tsz) != tsz) {
ret = -EFAULT;
goto out;
}
@@ -582,10 +576,6 @@ static int open_kcore(struct inode *inod
if (ret)
return ret;
- filp->private_data = kmalloc(PAGE_SIZE, GFP_KERNEL);
- if (!filp->private_data)
- return -ENOMEM;
-
if (kcore_need_update)
kcore_update_ram();
if (i_size_read(inode) != proc_root_kcore->size) {
@@ -596,16 +586,9 @@ static int open_kcore(struct inode *inod
return 0;
}
-static int release_kcore(struct inode *inode, struct file *file)
-{
- kfree(file->private_data);
- return 0;
-}
-
static const struct proc_ops kcore_proc_ops = {
.proc_read_iter = read_kcore_iter,
.proc_open = open_kcore,
- .proc_release = release_kcore,
.proc_lseek = default_llseek,
};
--- a/include/linux/vmalloc.h~mm-vmalloc-convert-vread-to-vread_iter
+++ a/include/linux/vmalloc.h
@@ -9,6 +9,7 @@
#include <asm/page.h> /* pgprot_t */
#include <linux/rbtree.h>
#include <linux/overflow.h>
+#include <linux/uio.h>
#include <asm/vmalloc.h>
@@ -251,7 +252,7 @@ static inline void set_vm_flush_reset_pe
#endif
/* for /proc/kcore */
-extern long vread(char *buf, char *addr, unsigned long count);
+extern long vread_iter(struct iov_iter *iter, char *addr, size_t count);
/*
* Internals. Don't use..
--- a/mm/nommu.c~mm-vmalloc-convert-vread-to-vread_iter
+++ a/mm/nommu.c
@@ -36,6 +36,7 @@
#include <linux/printk.h>
#include <linux/uaccess.h>
+#include <linux/uio.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>
@@ -198,14 +199,13 @@ unsigned long vmalloc_to_pfn(const void
}
EXPORT_SYMBOL(vmalloc_to_pfn);
-long vread(char *buf, char *addr, unsigned long count)
+long vread_iter(struct iov_iter *iter, char *addr, size_t count)
{
/* Don't allow overflow */
- if ((unsigned long) buf + count < count)
- count = -(unsigned long) buf;
+ if ((unsigned long) addr + count < count)
+ count = -(unsigned long) addr;
- memcpy(buf, addr, count);
- return count;
+ return copy_to_iter(addr, count, iter);
}
/*
--- a/mm/vmalloc.c~mm-vmalloc-convert-vread-to-vread_iter
+++ a/mm/vmalloc.c
@@ -37,7 +37,6 @@
#include <linux/rbtree_augmented.h>
#include <linux/overflow.h>
#include <linux/pgtable.h>
-#include <linux/uaccess.h>
#include <linux/hugetlb.h>
#include <linux/sched/mm.h>
#include <linux/rwsem.h>
@@ -3446,20 +3445,20 @@ EXPORT_SYMBOL(vmalloc_32_user);
* small helper routine , copy contents to buf from addr.
* If the page is not present, fill zero.
*/
-
-static int aligned_vread(char *buf, char *addr, unsigned long count)
+static void aligned_vread_iter(struct iov_iter *iter,
+ char *addr, size_t count)
{
- struct page *p;
- int copied = 0;
+ struct page *page;
- while (count) {
+ while (count > 0) {
unsigned long offset, length;
+ size_t copied = 0;
offset = offset_in_page(addr);
length = PAGE_SIZE - offset;
if (length > count)
length = count;
- p = vmalloc_to_page(addr);
+ page = vmalloc_to_page(addr);
/*
* To do safe access to this _mapped_ area, we need
* lock. But adding lock here means that we need to add
@@ -3467,23 +3466,24 @@ static int aligned_vread(char *buf, char
* interface, rarely used. Instead of that, we'll use
* kmap() and get small overhead in this access function.
*/
- if (p) {
+ if (page) {
/* We can expect USER0 is not used -- see vread() */
- void *map = kmap_atomic(p);
- memcpy(buf, map + offset, length);
- kunmap_atomic(map);
- } else
- memset(buf, 0, length);
+ void *map = kmap_local_page(page);
+
+ copied = copy_to_iter(map + offset, length, iter);
+ kunmap_local(map);
+ }
+
+ if (copied < length)
+ iov_iter_zero(length - copied, iter);
addr += length;
- buf += length;
- copied += length;
count -= length;
}
- return copied;
}
-static void vmap_ram_vread(char *buf, char *addr, int count, unsigned long flags)
+static void vmap_ram_vread_iter(struct iov_iter *iter, char *addr, int count,
+ unsigned long flags)
{
char *start;
struct vmap_block *vb;
@@ -3496,7 +3496,7 @@ static void vmap_ram_vread(char *buf, ch
* handle it here.
*/
if (!(flags & VMAP_BLOCK)) {
- aligned_vread(buf, addr, count);
+ aligned_vread_iter(iter, addr, count);
return;
}
@@ -3517,22 +3517,24 @@ static void vmap_ram_vread(char *buf, ch
if (!count)
break;
start = vmap_block_vaddr(vb->va->va_start, rs);
- while (addr < start) {
+
+ if (addr < start) {
+ size_t to_zero = min_t(size_t, start - addr, count);
+
+ iov_iter_zero(to_zero, iter);
+ addr += to_zero;
+ count -= (int)to_zero;
if (count == 0)
goto unlock;
- *buf = '\0';
- buf++;
- addr++;
- count--;
}
+
/*it could start reading from the middle of used region*/
offset = offset_in_page(addr);
n = ((re - rs + 1) << PAGE_SHIFT) - offset;
if (n > count)
n = count;
- aligned_vread(buf, start+offset, n);
+ aligned_vread_iter(iter, start + offset, n);
- buf += n;
addr += n;
count -= n;
}
@@ -3541,15 +3543,15 @@ unlock:
finished:
/* zero-fill the left dirty or free regions */
- if (count)
- memset(buf, 0, count);
+ if (count > 0)
+ iov_iter_zero(count, iter);
}
/**
- * vread() - read vmalloc area in a safe way.
- * @buf: buffer for reading data
- * @addr: vm address.
- * @count: number of bytes to be read.
+ * vread_iter() - read vmalloc area in a safe way to an iterator.
+ * @iter: the iterator to which data should be written.
+ * @addr: vm address.
+ * @count: number of bytes to be read.
*
* This function checks that addr is a valid vmalloc'ed area, and
* copy data from that area to a given buffer. If the given memory range
@@ -3569,13 +3571,13 @@ finished:
* (same number as @count) or %0 if [addr...addr+count) doesn't
* include any intersection with valid vmalloc area
*/
-long vread(char *buf, char *addr, unsigned long count)
+long vread_iter(struct iov_iter *iter, char *addr, size_t count)
{
struct vmap_area *va;
struct vm_struct *vm;
- char *vaddr, *buf_start = buf;
- unsigned long buflen = count;
- unsigned long n, size, flags;
+ char *vaddr;
+ size_t buflen = count;
+ size_t n, size, flags;
might_sleep();
@@ -3595,7 +3597,7 @@ long vread(char *buf, char *addr, unsign
goto finished;
list_for_each_entry_from(va, &vmap_area_list, list) {
- if (!count)
+ if (count == 0)
break;
vm = va->vm;
@@ -3619,36 +3621,39 @@ long vread(char *buf, char *addr, unsign
if (addr >= vaddr + size)
continue;
- while (addr < vaddr) {
+
+ if (addr < vaddr) {
+ size_t to_zero = min_t(size_t, vaddr - addr, count);
+
+ iov_iter_zero(to_zero, iter);
+ addr += to_zero;
+ count -= to_zero;
if (count == 0)
goto finished;
- *buf = '\0';
- buf++;
- addr++;
- count--;
}
+
n = vaddr + size - addr;
if (n > count)
n = count;
if (flags & VMAP_RAM)
- vmap_ram_vread(buf, addr, n, flags);
+ vmap_ram_vread_iter(iter, addr, n, flags);
else if (!(vm->flags & VM_IOREMAP))
- aligned_vread(buf, addr, n);
+ aligned_vread_iter(iter, addr, n);
else /* IOREMAP area is treated as memory hole */
- memset(buf, 0, n);
- buf += n;
+ iov_iter_zero(n, iter);
+
addr += n;
count -= n;
}
finished:
up_read(&vmap_area_lock);
- if (buf == buf_start)
+ if (count == buflen)
return 0;
/* zero-fill memory holes */
- if (buf != buf_start + buflen)
- memset(buf, 0, buflen - (buf - buf_start));
+ if (count > 0)
+ iov_iter_zero(count, iter);
return buflen;
}
_
Patches currently in -mm which might be from lstoakes@gmail.com are
mm-remove-unused-vmf_insert_mixed_prot.patch
mm-remove-vmf_insert_pfn_xxx_prot-for-huge-page-table-entries.patch
drm-ttm-remove-comment-referencing-now-removed-vmf_insert_mixed_prot.patch
mm-prefer-xxx_page-alloc-free-functions-for-order-0-pages.patch
mm-refactor-do_fault_around.patch
mm-pefer-fault_around_pages-to-fault_around_bytes.patch
fs-proc-kcore-avoid-bounce-buffer-for-ktext-data.patch
mm-vmalloc-use-rwsem-mutex-for-vmap_area_lock-and-vmap_block-lock.patch
fs-proc-kcore-convert-read_kcore-to-read_kcore_iter.patch
mm-vmalloc-convert-vread-to-vread_iter.patch
^ permalink raw reply [flat|nested] 3+ messages in thread
* + mm-vmalloc-convert-vread-to-vread_iter.patch added to mm-unstable branch
@ 2023-03-22 22:50 Andrew Morton
0 siblings, 0 replies; 3+ messages in thread
From: Andrew Morton @ 2023-03-22 22:50 UTC (permalink / raw)
To: mm-commits, willy, viro, urezki, liushixin2, jolsa, david, bhe,
axboe, lstoakes, akpm
The patch titled
Subject: mm: vmalloc: convert vread() to vread_iter()
has been added to the -mm mm-unstable branch. Its filename is
mm-vmalloc-convert-vread-to-vread_iter.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmalloc-convert-vread-to-vread_iter.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Lorenzo Stoakes <lstoakes@gmail.com>
Subject: mm: vmalloc: convert vread() to vread_iter()
Date: Wed, 22 Mar 2023 18:57:04 +0000
Having previously laid the foundation for converting vread() to an
iterator function, pull the trigger and do so.
This patch attempts to provide minimal refactoring and to reflect the
existing logic as best we can, for example we continue to zero portions of
memory not read, as before.
Overall, there should be no functional difference other than a performance
improvement in /proc/kcore access to vmalloc regions.
Now we have eliminated the need for a bounce buffer in read_kcore_iter(),
we dispense with it, and try to write to user memory optimistically but
with faults disabled via copy_page_to_iter_nofault(). We already have
preemption disabled by holding a spin lock. We continue faulting in until
the operation is complete.
Additionally, we must account for the fact that at any point a copy may
fail (most likely due to a fault not being able to occur), we exit
indicating fewer bytes retrieved than expected.
Link: https://lkml.kernel.org/r/941f88bc5ab928e6656e1e2593b91bf0f8c81e1b.1679511146.git.lstoakes@gmail.com
Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Baoquan He <bhe@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Liu Shixin <liushixin2@huawei.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
--- a/fs/proc/kcore.c~mm-vmalloc-convert-vread-to-vread_iter
+++ a/fs/proc/kcore.c
@@ -307,13 +307,9 @@ static void append_kcore_note(char *note
*i = ALIGN(*i + descsz, 4);
}
-static ssize_t
-read_kcore_iter(struct kiocb *iocb, struct iov_iter *iter)
+static ssize_t read_kcore_iter(struct kiocb *iocb, struct iov_iter *iter)
{
- struct file *file = iocb->ki_filp;
- char *buf = file->private_data;
loff_t *fpos = &iocb->ki_pos;
-
size_t phdrs_offset, notes_offset, data_offset;
size_t page_offline_frozen = 1;
size_t phdrs_len, notes_len;
@@ -507,13 +503,30 @@ read_kcore_iter(struct kiocb *iocb, stru
switch (m->type) {
case KCORE_VMALLOC:
- vread(buf, (char *)start, tsz);
- /* we have to zero-fill user buffer even if no read */
- if (copy_to_iter(buf, tsz, iter) != tsz) {
- ret = -EFAULT;
- goto out;
+ {
+ const char *src = (char *)start;
+ size_t read = 0, left = tsz;
+
+ /*
+ * vmalloc uses spinlocks, so we optimistically try to
+ * read memory. If this fails, fault pages in and try
+ * again until we are done.
+ */
+ while (true) {
+ read += vread_iter(iter, src, left);
+ if (read == tsz)
+ break;
+
+ src += read;
+ left -= read;
+
+ if (fault_in_iov_iter_writeable(iter, left)) {
+ ret = -EFAULT;
+ goto out;
+ }
}
break;
+ }
case KCORE_USER:
/* User page is handled prior to normal kernel page: */
if (copy_to_iter((char *)start, tsz, iter) != tsz) {
@@ -582,10 +595,6 @@ static int open_kcore(struct inode *inod
if (ret)
return ret;
- filp->private_data = kmalloc(PAGE_SIZE, GFP_KERNEL);
- if (!filp->private_data)
- return -ENOMEM;
-
if (kcore_need_update)
kcore_update_ram();
if (i_size_read(inode) != proc_root_kcore->size) {
@@ -596,16 +605,9 @@ static int open_kcore(struct inode *inod
return 0;
}
-static int release_kcore(struct inode *inode, struct file *file)
-{
- kfree(file->private_data);
- return 0;
-}
-
static const struct proc_ops kcore_proc_ops = {
.proc_read_iter = read_kcore_iter,
.proc_open = open_kcore,
- .proc_release = release_kcore,
.proc_lseek = default_llseek,
};
--- a/include/linux/vmalloc.h~mm-vmalloc-convert-vread-to-vread_iter
+++ a/include/linux/vmalloc.h
@@ -9,6 +9,7 @@
#include <asm/page.h> /* pgprot_t */
#include <linux/rbtree.h>
#include <linux/overflow.h>
+#include <linux/uio.h>
#include <asm/vmalloc.h>
@@ -247,7 +248,7 @@ static inline void set_vm_flush_reset_pe
#endif
/* for /proc/kcore */
-extern long vread(char *buf, char *addr, unsigned long count);
+extern long vread_iter(struct iov_iter *iter, const char *addr, size_t count);
/*
* Internals. Don't use..
--- a/mm/nommu.c~mm-vmalloc-convert-vread-to-vread_iter
+++ a/mm/nommu.c
@@ -36,6 +36,7 @@
#include <linux/printk.h>
#include <linux/uaccess.h>
+#include <linux/uio.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>
@@ -198,14 +199,13 @@ unsigned long vmalloc_to_pfn(const void
}
EXPORT_SYMBOL(vmalloc_to_pfn);
-long vread(char *buf, char *addr, unsigned long count)
+long vread_iter(struct iov_iter *iter, const char *addr, size_t count)
{
/* Don't allow overflow */
- if ((unsigned long) buf + count < count)
- count = -(unsigned long) buf;
+ if ((unsigned long) addr + count < count)
+ count = -(unsigned long) addr;
- memcpy(buf, addr, count);
- return count;
+ return copy_to_iter(addr, count, iter);
}
/*
--- a/mm/vmalloc.c~mm-vmalloc-convert-vread-to-vread_iter
+++ a/mm/vmalloc.c
@@ -37,7 +37,6 @@
#include <linux/rbtree_augmented.h>
#include <linux/overflow.h>
#include <linux/pgtable.h>
-#include <linux/uaccess.h>
#include <linux/hugetlb.h>
#include <linux/sched/mm.h>
#include <asm/tlbflush.h>
@@ -3442,62 +3441,96 @@ void *vmalloc_32_user(unsigned long size
EXPORT_SYMBOL(vmalloc_32_user);
/*
- * small helper routine , copy contents to buf from addr.
- * If the page is not present, fill zero.
+ * Atomically zero bytes in the iterator.
+ *
+ * Returns the number of zeroed bytes.
*/
+size_t zero_iter(struct iov_iter *iter, size_t count)
+{
+ size_t remains = count;
+
+ while (remains > 0) {
+ size_t num, copied;
+
+ num = remains < PAGE_SIZE ? remains : PAGE_SIZE;
+ copied = copy_page_to_iter_nofault(ZERO_PAGE(0), 0, num, iter);
+ remains -= copied;
+
+ if (copied < num)
+ break;
+ }
-static int aligned_vread(char *buf, char *addr, unsigned long count)
+ return count - remains;
+}
+
+/*
+ * small helper routine, copy contents to iter from addr.
+ * If the page is not present, fill zero.
+ *
+ * Returns the number of copied bytes.
+ */
+static size_t aligned_vread_iter(struct iov_iter *iter,
+ const char *addr, size_t count)
{
- struct page *p;
- int copied = 0;
+ size_t remains = count;
+ struct page *page;
- while (count) {
+ while (remains > 0) {
unsigned long offset, length;
+ size_t copied = 0;
offset = offset_in_page(addr);
length = PAGE_SIZE - offset;
- if (length > count)
- length = count;
- p = vmalloc_to_page(addr);
+ if (length > remains)
+ length = remains;
+ page = vmalloc_to_page(addr);
/*
- * To do safe access to this _mapped_ area, we need
- * lock. But adding lock here means that we need to add
- * overhead of vmalloc()/vfree() calls for this _debug_
- * interface, rarely used. Instead of that, we'll use
- * kmap() and get small overhead in this access function.
+ * To do safe access to this _mapped_ area, we need lock. But
+ * adding lock here means that we need to add overhead of
+ * vmalloc()/vfree() calls for this _debug_ interface, rarely
+ * used. Instead of that, we'll use an local mapping via
+ * copy_page_to_iter_nofault() and accept a small overhead in
+ * this access function.
*/
- if (p) {
- /* We can expect USER0 is not used -- see vread() */
- void *map = kmap_atomic(p);
- memcpy(buf, map + offset, length);
- kunmap_atomic(map);
- } else
- memset(buf, 0, length);
+ if (page)
+ copied = copy_page_to_iter_nofault(page, offset,
+ length, iter);
+ else
+ copied = zero_iter(iter, length);
- addr += length;
- buf += length;
- copied += length;
- count -= length;
+ addr += copied;
+ remains -= copied;
+
+ if (copied != length)
+ break;
}
- return copied;
+
+ return count - remains;
}
-static void vmap_ram_vread(char *buf, char *addr, int count, unsigned long flags)
+/*
+ * Read from a vm_map_ram region of memory.
+ *
+ * Returns the number of copied bytes.
+ */
+static size_t vmap_ram_vread_iter(struct iov_iter *iter, const char *addr,
+ size_t count, unsigned long flags)
{
char *start;
struct vmap_block *vb;
unsigned long offset;
- unsigned int rs, re, n;
+ unsigned int rs, re;
+ size_t remains, n;
/*
* If it's area created by vm_map_ram() interface directly, but
* not further subdividing and delegating management to vmap_block,
* handle it here.
*/
- if (!(flags & VMAP_BLOCK)) {
- aligned_vread(buf, addr, count);
- return;
- }
+ if (!(flags & VMAP_BLOCK))
+ return aligned_vread_iter(iter, addr, count);
+
+ remains = count;
/*
* Area is split into regions and tracked with vmap_block, read out
@@ -3505,50 +3538,64 @@ static void vmap_ram_vread(char *buf, ch
*/
vb = xa_load(&vmap_blocks, addr_to_vb_idx((unsigned long)addr));
if (!vb)
- goto finished;
+ goto finished_zero;
spin_lock(&vb->lock);
if (bitmap_empty(vb->used_map, VMAP_BBMAP_BITS)) {
spin_unlock(&vb->lock);
- goto finished;
+ goto finished_zero;
}
+
for_each_set_bitrange(rs, re, vb->used_map, VMAP_BBMAP_BITS) {
- if (!count)
- break;
+ size_t copied;
+
+ if (remains == 0)
+ goto finished;
+
start = vmap_block_vaddr(vb->va->va_start, rs);
- while (addr < start) {
- if (count == 0)
- goto unlock;
- *buf = '\0';
- buf++;
- addr++;
- count--;
+
+ if (addr < start) {
+ size_t to_zero = min_t(size_t, start - addr, remains);
+ size_t zeroed = zero_iter(iter, to_zero);
+
+ addr += zeroed;
+ remains -= zeroed;
+
+ if (remains == 0 || zeroed != to_zero)
+ goto finished;
}
+
/*it could start reading from the middle of used region*/
offset = offset_in_page(addr);
n = ((re - rs + 1) << PAGE_SHIFT) - offset;
- if (n > count)
- n = count;
- aligned_vread(buf, start+offset, n);
-
- buf += n;
- addr += n;
- count -= n;
+ if (n > remains)
+ n = remains;
+
+ copied = aligned_vread_iter(iter, start + offset, n);
+
+ addr += copied;
+ remains -= copied;
+
+ if (copied != n)
+ goto finished;
}
-unlock:
+
spin_unlock(&vb->lock);
-finished:
+finished_zero:
/* zero-fill the left dirty or free regions */
- if (count)
- memset(buf, 0, count);
+ return count - remains + zero_iter(iter, remains);
+finished:
+ /* We couldn't copy/zero everything */
+ spin_unlock(&vb->lock);
+ return count - remains;
}
/**
- * vread() - read vmalloc area in a safe way.
- * @buf: buffer for reading data
- * @addr: vm address.
- * @count: number of bytes to be read.
+ * vread_iter() - read vmalloc area in a safe way to an iterator.
+ * @iter: the iterator to which data should be written.
+ * @addr: vm address.
+ * @count: number of bytes to be read.
*
* This function checks that addr is a valid vmalloc'ed area, and
* copy data from that area to a given buffer. If the given memory range
@@ -3568,13 +3615,12 @@ finished:
* (same number as @count) or %0 if [addr...addr+count) doesn't
* include any intersection with valid vmalloc area
*/
-long vread(char *buf, char *addr, unsigned long count)
+long vread_iter(struct iov_iter *iter, const char *addr, size_t count)
{
struct vmap_area *va;
struct vm_struct *vm;
- char *vaddr, *buf_start = buf;
- unsigned long buflen = count;
- unsigned long n, size, flags;
+ char *vaddr;
+ size_t n, size, flags, remains;
addr = kasan_reset_tag(addr);
@@ -3582,18 +3628,22 @@ long vread(char *buf, char *addr, unsign
if ((unsigned long) addr + count < count)
count = -(unsigned long) addr;
+ remains = count;
+
spin_lock(&vmap_area_lock);
va = find_vmap_area_exceed_addr((unsigned long)addr);
if (!va)
- goto finished;
+ goto finished_zero;
/* no intersects with alive vmap_area */
- if ((unsigned long)addr + count <= va->va_start)
- goto finished;
+ if ((unsigned long)addr + remains <= va->va_start)
+ goto finished_zero;
list_for_each_entry_from(va, &vmap_area_list, list) {
- if (!count)
- break;
+ size_t copied;
+
+ if (remains == 0)
+ goto finished;
vm = va->vm;
flags = va->flags & VMAP_FLAGS_MASK;
@@ -3608,6 +3658,7 @@ long vread(char *buf, char *addr, unsign
if (vm && (vm->flags & VM_UNINITIALIZED))
continue;
+
/* Pair with smp_wmb() in clear_vm_uninitialized_flag() */
smp_rmb();
@@ -3616,38 +3667,45 @@ long vread(char *buf, char *addr, unsign
if (addr >= vaddr + size)
continue;
- while (addr < vaddr) {
- if (count == 0)
+
+ if (addr < vaddr) {
+ size_t to_zero = min_t(size_t, vaddr - addr, remains);
+ size_t zeroed = zero_iter(iter, to_zero);
+
+ addr += zeroed;
+ remains -= zeroed;
+
+ if (remains == 0 || zeroed != to_zero)
goto finished;
- *buf = '\0';
- buf++;
- addr++;
- count--;
}
+
n = vaddr + size - addr;
- if (n > count)
- n = count;
+ if (n > remains)
+ n = remains;
if (flags & VMAP_RAM)
- vmap_ram_vread(buf, addr, n, flags);
+ copied = vmap_ram_vread_iter(iter, addr, n, flags);
else if (!(vm->flags & VM_IOREMAP))
- aligned_vread(buf, addr, n);
+ copied = aligned_vread_iter(iter, addr, n);
else /* IOREMAP area is treated as memory hole */
- memset(buf, 0, n);
- buf += n;
- addr += n;
- count -= n;
+ copied = zero_iter(iter, n);
+
+ addr += copied;
+ remains -= copied;
+
+ if (copied != n)
+ goto finished;
}
-finished:
- spin_unlock(&vmap_area_lock);
- if (buf == buf_start)
- return 0;
+finished_zero:
+ spin_unlock(&vmap_area_lock);
/* zero-fill memory holes */
- if (buf != buf_start + buflen)
- memset(buf, 0, buflen - (buf - buf_start));
+ return count - remains + zero_iter(iter, remains);
+finished:
+ /* Nothing remains, or We couldn't copy/zero everything. */
+ spin_unlock(&vmap_area_lock);
- return buflen;
+ return count - remains;
}
/**
_
Patches currently in -mm which might be from lstoakes@gmail.com are
mm-prefer-xxx_page-alloc-free-functions-for-order-0-pages.patch
mm-refactor-do_fault_around.patch
mm-pefer-fault_around_pages-to-fault_around_bytes.patch
maintainers-add-myself-as-vmalloc-reviewer.patch
mm-remove-unused-vmf_insert_mixed_prot.patch
mm-remove-vmf_insert_pfn_xxx_prot-for-huge-page-table-entries.patch
drm-ttm-remove-comment-referencing-now-removed-vmf_insert_mixed_prot.patch
fs-proc-kcore-avoid-bounce-buffer-for-ktext-data.patch
fs-proc-kcore-convert-read_kcore-to-read_kcore_iter.patch
iov_iter-add-copy_page_to_iter_nofault.patch
mm-vmalloc-convert-vread-to-vread_iter.patch
mm-mmap-vma_merge-further-improve-prev-next-vma-naming.patch
mm-mmap-vma_merge-fold-curr-next-assignment-logic.patch
mm-mmap-vma_merge-explicitly-assign-res-vma-extend-invariants.patch
mm-mmap-vma_merge-init-cleanup-be-explicit-about-the-non-mergeable-case.patch
^ permalink raw reply [flat|nested] 3+ messages in thread
* + mm-vmalloc-convert-vread-to-vread_iter.patch added to mm-unstable branch
@ 2023-03-21 21:15 Andrew Morton
0 siblings, 0 replies; 3+ messages in thread
From: Andrew Morton @ 2023-03-21 21:15 UTC (permalink / raw)
To: mm-commits, willy, viro, urezki, liushixin2, jolsa, david, bhe,
axboe, lstoakes, akpm
The patch titled
Subject: mm: vmalloc: convert vread() to vread_iter()
has been added to the -mm mm-unstable branch. Its filename is
mm-vmalloc-convert-vread-to-vread_iter.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmalloc-convert-vread-to-vread_iter.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Lorenzo Stoakes <lstoakes@gmail.com>
Subject: mm: vmalloc: convert vread() to vread_iter()
Date: Tue, 21 Mar 2023 20:54:33 +0000
Having previously laid the foundation for converting vread() to an
iterator function, pull the trigger and do so.
This patch attempts to provide minimal refactoring and to reflect the
existing logic as best we can, for example we continue to zero portions of
memory not read, as before.
Overall, there should be no functional difference other than a performance
improvement in /proc/kcore access to vmalloc regions.
Now we have eliminated the need for a bounce buffer in read_kcore_iter(),
we dispense with it. We need to ensure userland pages are faulted in
before proceeding, as we take spin locks.
Additionally, we must account for the fact that at any point a copy may
fail if this happens, we exit indicating fewer bytes retrieved than
expected.
Link: https://lkml.kernel.org/r/6b3899bbbf1f4bd6b7133c8b6f27b3a8791607b0.1679431886.git.lstoakes@gmail.com
Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Baoquan He <bhe@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Liu Shixin <liushixin2@huawei.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/proc/kcore.c | 26 +---
include/linux/vmalloc.h | 3
mm/nommu.c | 10 -
mm/vmalloc.c | 236 +++++++++++++++++++++++---------------
4 files changed, 161 insertions(+), 114 deletions(-)
--- a/fs/proc/kcore.c~mm-vmalloc-convert-vread-to-vread_iter
+++ a/fs/proc/kcore.c
@@ -307,13 +307,9 @@ static void append_kcore_note(char *note
*i = ALIGN(*i + descsz, 4);
}
-static ssize_t
-read_kcore_iter(struct kiocb *iocb, struct iov_iter *iter)
+static ssize_t read_kcore_iter(struct kiocb *iocb, struct iov_iter *iter)
{
- struct file *file = iocb->ki_filp;
- char *buf = file->private_data;
loff_t *ppos = &iocb->ki_pos;
-
size_t phdrs_offset, notes_offset, data_offset;
size_t page_offline_frozen = 1;
size_t phdrs_len, notes_len;
@@ -507,9 +503,12 @@ read_kcore_iter(struct kiocb *iocb, stru
switch (m->type) {
case KCORE_VMALLOC:
- vread(buf, (char *)start, tsz);
- /* we have to zero-fill user buffer even if no read */
- if (copy_to_iter(buf, tsz, iter) != tsz) {
+ /*
+ * Make sure user pages are faulted in as we acquire
+ * spinlocks in vread_iter().
+ */
+ if (fault_in_iov_iter_writeable(iter, tsz) ||
+ vread_iter(iter, (char *)start, tsz) != tsz) {
ret = -EFAULT;
goto out;
}
@@ -582,10 +581,6 @@ static int open_kcore(struct inode *inod
if (ret)
return ret;
- filp->private_data = kmalloc(PAGE_SIZE, GFP_KERNEL);
- if (!filp->private_data)
- return -ENOMEM;
-
if (kcore_need_update)
kcore_update_ram();
if (i_size_read(inode) != proc_root_kcore->size) {
@@ -596,16 +591,9 @@ static int open_kcore(struct inode *inod
return 0;
}
-static int release_kcore(struct inode *inode, struct file *file)
-{
- kfree(file->private_data);
- return 0;
-}
-
static const struct proc_ops kcore_proc_ops = {
.proc_read_iter = read_kcore_iter,
.proc_open = open_kcore,
- .proc_release = release_kcore,
.proc_lseek = default_llseek,
};
--- a/include/linux/vmalloc.h~mm-vmalloc-convert-vread-to-vread_iter
+++ a/include/linux/vmalloc.h
@@ -9,6 +9,7 @@
#include <asm/page.h> /* pgprot_t */
#include <linux/rbtree.h>
#include <linux/overflow.h>
+#include <linux/uio.h>
#include <asm/vmalloc.h>
@@ -247,7 +248,7 @@ static inline void set_vm_flush_reset_pe
#endif
/* for /proc/kcore */
-extern long vread(char *buf, char *addr, unsigned long count);
+extern long vread_iter(struct iov_iter *iter, const char *addr, size_t count);
/*
* Internals. Don't use..
--- a/mm/nommu.c~mm-vmalloc-convert-vread-to-vread_iter
+++ a/mm/nommu.c
@@ -36,6 +36,7 @@
#include <linux/printk.h>
#include <linux/uaccess.h>
+#include <linux/uio.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>
@@ -198,14 +199,13 @@ unsigned long vmalloc_to_pfn(const void
}
EXPORT_SYMBOL(vmalloc_to_pfn);
-long vread(char *buf, char *addr, unsigned long count)
+long vread_iter(struct iov_iter *iter, char *addr, size_t count)
{
/* Don't allow overflow */
- if ((unsigned long) buf + count < count)
- count = -(unsigned long) buf;
+ if ((unsigned long) addr + count < count)
+ count = -(unsigned long) addr;
- memcpy(buf, addr, count);
- return count;
+ return copy_to_iter(addr, count, iter);
}
/*
--- a/mm/vmalloc.c~mm-vmalloc-convert-vread-to-vread_iter
+++ a/mm/vmalloc.c
@@ -37,7 +37,6 @@
#include <linux/rbtree_augmented.h>
#include <linux/overflow.h>
#include <linux/pgtable.h>
-#include <linux/uaccess.h>
#include <linux/hugetlb.h>
#include <linux/sched/mm.h>
#include <asm/tlbflush.h>
@@ -3442,62 +3441,95 @@ void *vmalloc_32_user(unsigned long size
EXPORT_SYMBOL(vmalloc_32_user);
/*
- * small helper routine , copy contents to buf from addr.
- * If the page is not present, fill zero.
+ * Atomically zero bytes in the iterator.
+ *
+ * Returns the number of zeroed bytes.
*/
+size_t zero_iter(struct iov_iter *iter, size_t count)
+{
+ size_t remains = count;
+
+ while (remains > 0) {
+ size_t num, copied;
+
+ num = remains < PAGE_SIZE ? remains : PAGE_SIZE;
+ copied = copy_page_to_iter_atomic(ZERO_PAGE(0), 0, num, iter);
+ remains -= copied;
+
+ if (copied < num)
+ break;
+ }
-static int aligned_vread(char *buf, char *addr, unsigned long count)
+ return count - remains;
+}
+
+/*
+ * small helper routine, copy contents to iter from addr.
+ * If the page is not present, fill zero.
+ *
+ * Returns the number of copied bytes.
+ */
+static size_t aligned_vread_iter(struct iov_iter *iter,
+ const char *addr, size_t count)
{
- struct page *p;
- int copied = 0;
+ size_t remains = count;
+ struct page *page;
- while (count) {
+ while (remains > 0) {
unsigned long offset, length;
+ size_t copied = 0;
offset = offset_in_page(addr);
length = PAGE_SIZE - offset;
- if (length > count)
- length = count;
- p = vmalloc_to_page(addr);
+ if (length > remains)
+ length = remains;
+ page = vmalloc_to_page(addr);
/*
- * To do safe access to this _mapped_ area, we need
- * lock. But adding lock here means that we need to add
- * overhead of vmalloc()/vfree() calls for this _debug_
- * interface, rarely used. Instead of that, we'll use
- * kmap() and get small overhead in this access function.
+ * To do safe access to this _mapped_ area, we need lock. But
+ * adding lock here means that we need to add overhead of
+ * vmalloc()/vfree() calls for this _debug_ interface, rarely
+ * used. Instead of that, we'll use an local mapping via
+ * copy_page_to_iter_atomic() and accept a small overhead in
+ * this access function.
*/
- if (p) {
- /* We can expect USER0 is not used -- see vread() */
- void *map = kmap_atomic(p);
- memcpy(buf, map + offset, length);
- kunmap_atomic(map);
- } else
- memset(buf, 0, length);
+ if (page)
+ copied = copy_page_to_iter_atomic(page, offset, length,
+ iter);
+
+ /* Zero anything we were unable to copy. */
+ copied += zero_iter(iter, length - copied);
- addr += length;
- buf += length;
- copied += length;
- count -= length;
+ addr += copied;
+ remains -= copied;
+
+ if (copied != length)
+ break;
}
- return copied;
+
+ return count - remains;
}
-static void vmap_ram_vread(char *buf, char *addr, int count, unsigned long flags)
+/*
+ * Read from a vm_map_ram region of memory.
+ *
+ * Returns the number of copied bytes.
+ */
+static size_t vmap_ram_vread_iter(struct iov_iter *iter, const char *addr,
+ size_t count, unsigned long flags)
{
char *start;
struct vmap_block *vb;
unsigned long offset;
- unsigned int rs, re, n;
+ unsigned int rs, re;
+ size_t remains, n;
/*
* If it's area created by vm_map_ram() interface directly, but
* not further subdividing and delegating management to vmap_block,
* handle it here.
*/
- if (!(flags & VMAP_BLOCK)) {
- aligned_vread(buf, addr, count);
- return;
- }
+ if (!(flags & VMAP_BLOCK))
+ return aligned_vread_iter(iter, addr, count);
/*
* Area is split into regions and tracked with vmap_block, read out
@@ -3505,50 +3537,65 @@ static void vmap_ram_vread(char *buf, ch
*/
vb = xa_load(&vmap_blocks, addr_to_vb_idx((unsigned long)addr));
if (!vb)
- goto finished;
+ goto finished_zero;
spin_lock(&vb->lock);
if (bitmap_empty(vb->used_map, VMAP_BBMAP_BITS)) {
spin_unlock(&vb->lock);
- goto finished;
+ goto finished_zero;
}
+
+ remains = count;
for_each_set_bitrange(rs, re, vb->used_map, VMAP_BBMAP_BITS) {
- if (!count)
- break;
+ size_t copied;
+
+ if (remains == 0)
+ goto finished;
+
start = vmap_block_vaddr(vb->va->va_start, rs);
- while (addr < start) {
- if (count == 0)
- goto unlock;
- *buf = '\0';
- buf++;
- addr++;
- count--;
+
+ if (addr < start) {
+ size_t to_zero = min_t(size_t, start - addr, remains);
+ size_t zeroed = zero_iter(iter, to_zero);
+
+ addr += zeroed;
+ remains -= zeroed;
+
+ if (remains == 0 || zeroed != to_zero)
+ goto finished;
}
+
/*it could start reading from the middle of used region*/
offset = offset_in_page(addr);
n = ((re - rs + 1) << PAGE_SHIFT) - offset;
- if (n > count)
- n = count;
- aligned_vread(buf, start+offset, n);
-
- buf += n;
- addr += n;
- count -= n;
+ if (n > remains)
+ n = remains;
+
+ copied = aligned_vread_iter(iter, start + offset, n);
+
+ addr += copied;
+ remains -= copied;
+
+ if (copied != n)
+ goto finished;
}
-unlock:
+
spin_unlock(&vb->lock);
-finished:
+finished_zero:
/* zero-fill the left dirty or free regions */
- if (count)
- memset(buf, 0, count);
+ return count - remains + zero_iter(iter, remains);
+finished:
+ /* We couldn't copy/zero everything */
+ spin_unlock(&vb->lock);
+ return count - remains;
}
/**
- * vread() - read vmalloc area in a safe way.
- * @buf: buffer for reading data
- * @addr: vm address.
- * @count: number of bytes to be read.
+ * vread_iter() - read vmalloc area in a safe way to an iterator.
+ * @iter: the iterator to which data should be written.
+ * @addr: vm address.
+ * @count: number of bytes to be read.
*
* This function checks that addr is a valid vmalloc'ed area, and
* copy data from that area to a given buffer. If the given memory range
@@ -3568,13 +3615,12 @@ finished:
* (same number as @count) or %0 if [addr...addr+count) doesn't
* include any intersection with valid vmalloc area
*/
-long vread(char *buf, char *addr, unsigned long count)
+long vread_iter(struct iov_iter *iter, const char *addr, size_t count)
{
struct vmap_area *va;
struct vm_struct *vm;
- char *vaddr, *buf_start = buf;
- unsigned long buflen = count;
- unsigned long n, size, flags;
+ char *vaddr;
+ size_t n, size, flags, remains;
addr = kasan_reset_tag(addr);
@@ -3582,18 +3628,22 @@ long vread(char *buf, char *addr, unsign
if ((unsigned long) addr + count < count)
count = -(unsigned long) addr;
+ remains = count;
+
spin_lock(&vmap_area_lock);
va = find_vmap_area_exceed_addr((unsigned long)addr);
if (!va)
- goto finished;
+ goto finished_zero;
/* no intersects with alive vmap_area */
- if ((unsigned long)addr + count <= va->va_start)
- goto finished;
+ if ((unsigned long)addr + remains <= va->va_start)
+ goto finished_zero;
list_for_each_entry_from(va, &vmap_area_list, list) {
- if (!count)
- break;
+ size_t copied;
+
+ if (remains == 0)
+ goto finished;
vm = va->vm;
flags = va->flags & VMAP_FLAGS_MASK;
@@ -3608,6 +3658,7 @@ long vread(char *buf, char *addr, unsign
if (vm && (vm->flags & VM_UNINITIALIZED))
continue;
+
/* Pair with smp_wmb() in clear_vm_uninitialized_flag() */
smp_rmb();
@@ -3616,38 +3667,45 @@ long vread(char *buf, char *addr, unsign
if (addr >= vaddr + size)
continue;
- while (addr < vaddr) {
- if (count == 0)
+
+ if (addr < vaddr) {
+ size_t to_zero = min_t(size_t, vaddr - addr, remains);
+ size_t zeroed = zero_iter(iter, to_zero);
+
+ addr += zeroed;
+ remains -= zeroed;
+
+ if (remains == 0 || zeroed != to_zero)
goto finished;
- *buf = '\0';
- buf++;
- addr++;
- count--;
}
+
n = vaddr + size - addr;
- if (n > count)
- n = count;
+ if (n > remains)
+ n = remains;
if (flags & VMAP_RAM)
- vmap_ram_vread(buf, addr, n, flags);
+ copied = vmap_ram_vread_iter(iter, addr, n, flags);
else if (!(vm->flags & VM_IOREMAP))
- aligned_vread(buf, addr, n);
+ copied = aligned_vread_iter(iter, addr, n);
else /* IOREMAP area is treated as memory hole */
- memset(buf, 0, n);
- buf += n;
- addr += n;
- count -= n;
+ copied = zero_iter(iter, n);
+
+ addr += copied;
+ remains -= copied;
+
+ if (copied != n)
+ goto finished;
}
-finished:
- spin_unlock(&vmap_area_lock);
- if (buf == buf_start)
- return 0;
+finished_zero:
+ spin_unlock(&vmap_area_lock);
/* zero-fill memory holes */
- if (buf != buf_start + buflen)
- memset(buf, 0, buflen - (buf - buf_start));
+ return count - remains + zero_iter(iter, remains);
+finished:
+ /* Nothing remains, or We couldn't copy/zero everything. */
+ spin_unlock(&vmap_area_lock);
- return buflen;
+ return count - remains;
}
/**
_
Patches currently in -mm which might be from lstoakes@gmail.com are
mm-prefer-xxx_page-alloc-free-functions-for-order-0-pages.patch
mm-refactor-do_fault_around.patch
mm-pefer-fault_around_pages-to-fault_around_bytes.patch
maintainers-add-myself-as-vmalloc-reviewer.patch
mm-remove-unused-vmf_insert_mixed_prot.patch
mm-remove-vmf_insert_pfn_xxx_prot-for-huge-page-table-entries.patch
drm-ttm-remove-comment-referencing-now-removed-vmf_insert_mixed_prot.patch
mm-mmap-vma_merge-further-improve-prev-next-vma-naming.patch
mm-mmap-vma_merge-set-next-to-null-if-not-applicable.patch
mm-mmap-vma_merge-extend-invariants-avoid-invalid-res-vma.patch
mm-mmap-vma_merge-init-cleanup-be-explicit-about-the-non-mergeable-case.patch
fs-proc-kcore-avoid-bounce-buffer-for-ktext-data.patch
fs-proc-kcore-convert-read_kcore-to-read_kcore_iter.patch
iov_iter-add-copy_page_to_iter_atomic.patch
mm-vmalloc-convert-vread-to-vread_iter.patch
^ permalink raw reply [flat|nested] 3+ messages in thread
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2023-03-19 20:10 + mm-vmalloc-convert-vread-to-vread_iter.patch added to mm-unstable branch Andrew Morton
2023-03-21 21:15 Andrew Morton
2023-03-22 22:50 Andrew Morton
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