From: Andrew Morton <akpm@linux-foundation.org>
To: akpm@linux-foundation.org, daniel@ffwll.ch, david@fromorbit.com,
david@redhat.com, jack@suse.cz, jglisse@redhat.com,
jhubbard@nvidia.com, jrdr.linux@gmail.com, linux-mm@kvack.org,
mm-commits@vger.kernel.org, pankaj.gupta.linux@gmail.com,
torvalds@linux-foundation.org, vbabka@suse.cz
Subject: [patch 18/54] mm/gup: introduce pin_user_pages_locked()
Date: Sun, 07 Jun 2020 21:41:02 -0700 [thread overview]
Message-ID: <20200608044102.WqWr6YExw%akpm@linux-foundation.org> (raw)
In-Reply-To: <20200607212615.b050e41fac139a1e16fe00bd@linux-foundation.org>
From: John Hubbard <jhubbard@nvidia.com>
Subject: mm/gup: introduce pin_user_pages_locked()
Patch series "mm/gup: introduce pin_user_pages_locked(), use it in frame_vector.c", v2.
This adds yet one more pin_user_pages*() variant, and uses that to convert
mm/frame_vector.c.
With this, along with maybe 20 or 30 other recent patches in various
trees, we are close to having the relevant gup call sites converted--with
the notable exception of the bio/block layer.
This patch (of 2):
Introduce pin_user_pages_locked(), which is nearly identical to
get_user_pages_locked() except that it sets FOLL_PIN and rejects FOLL_GET.
As with other pairs of get_user_pages*() and pin_user_pages() API calls,
it's prudent to assert that FOLL_PIN is *not* set in the get_user_pages*()
call, so add that as part of this.
[jhubbard@nvidia.com: v2]
Link: http://lkml.kernel.org/r/20200531234131.770697-2-jhubbard@nvidia.com
Link: http://lkml.kernel.org/r/20200531234131.770697-1-jhubbard@nvidia.com
Link: http://lkml.kernel.org/r/20200527223243.884385-1-jhubbard@nvidia.com
Link: http://lkml.kernel.org/r/20200527223243.884385-2-jhubbard@nvidia.com
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Jan Kara <jack@suse.cz>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Souptick Joarder <jrdr.linux@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/mm.h | 2 ++
mm/gup.c | 36 ++++++++++++++++++++++++++++++++++++
2 files changed, 38 insertions(+)
--- a/include/linux/mm.h~mm-gup-introduce-pin_user_pages_locked
+++ a/include/linux/mm.h
@@ -1706,6 +1706,8 @@ long pin_user_pages(unsigned long start,
struct vm_area_struct **vmas);
long get_user_pages_locked(unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages, int *locked);
+long pin_user_pages_locked(unsigned long start, unsigned long nr_pages,
+ unsigned int gup_flags, struct page **pages, int *locked);
long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages,
struct page **pages, unsigned int gup_flags);
long pin_user_pages_unlocked(unsigned long start, unsigned long nr_pages,
--- a/mm/gup.c~mm-gup-introduce-pin_user_pages_locked
+++ a/mm/gup.c
@@ -2035,6 +2035,12 @@ long get_user_pages_locked(unsigned long
*/
if (WARN_ON_ONCE(gup_flags & FOLL_LONGTERM))
return -EINVAL;
+ /*
+ * FOLL_PIN must only be set internally by the pin_user_pages*() APIs,
+ * never directly by the caller, so enforce that:
+ */
+ if (WARN_ON_ONCE(gup_flags & FOLL_PIN))
+ return -EINVAL;
return __get_user_pages_locked(current, current->mm, start, nr_pages,
pages, NULL, locked,
@@ -3058,3 +3064,33 @@ long pin_user_pages_unlocked(unsigned lo
return get_user_pages_unlocked(start, nr_pages, pages, gup_flags);
}
EXPORT_SYMBOL(pin_user_pages_unlocked);
+
+/*
+ * pin_user_pages_locked() is the FOLL_PIN variant of get_user_pages_locked().
+ * Behavior is the same, except that this one sets FOLL_PIN and rejects
+ * FOLL_GET.
+ */
+long pin_user_pages_locked(unsigned long start, unsigned long nr_pages,
+ unsigned int gup_flags, struct page **pages,
+ int *locked)
+{
+ /*
+ * FIXME: Current FOLL_LONGTERM behavior is incompatible with
+ * FAULT_FLAG_ALLOW_RETRY because of the FS DAX check requirement on
+ * vmas. As there are no users of this flag in this call we simply
+ * disallow this option for now.
+ */
+ if (WARN_ON_ONCE(gup_flags & FOLL_LONGTERM))
+ return -EINVAL;
+
+ /* FOLL_GET and FOLL_PIN are mutually exclusive. */
+ if (WARN_ON_ONCE(gup_flags & FOLL_GET))
+ return -EINVAL;
+
+ gup_flags |= FOLL_PIN;
+ return __get_user_pages_locked(current, current->mm, start, nr_pages,
+ pages, NULL, locked,
+ gup_flags | FOLL_TOUCH);
+}
+EXPORT_SYMBOL(pin_user_pages_locked);
+
_
next prev parent reply other threads:[~2020-06-08 4:41 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200607212615.b050e41fac139a1e16fe00bd@linux-foundation.org>
2020-06-08 4:40 ` [patch 01/54] mm/page_idle.c: skip offline pages Andrew Morton
2020-06-08 4:40 ` [patch 02/54] ipc/msg: add missing annotation for freeque() Andrew Morton
2020-06-08 4:40 ` [patch 03/54] ipc/namespace.c: use a work queue to free_ipc Andrew Morton
2020-06-08 4:40 ` [patch 04/54] dynamic_debug: add an option to enable dynamic debug for modules only Andrew Morton
2020-06-08 4:58 ` 答复: " 翟京 (Orson Zhai)
2020-06-08 4:40 ` [patch 05/54] kernel: add panic_on_taint Andrew Morton
2020-06-08 4:40 ` [patch 06/54] xarray.h: correct return code documentation for xa_store_{bh,irq}() Andrew Morton
2020-06-08 4:40 ` [patch 07/54] kernel/sysctl: support setting sysctl parameters from kernel command line Andrew Morton
2020-06-08 4:40 ` [patch 08/54] kernel/sysctl: support handling command line aliases Andrew Morton
2020-06-08 4:40 ` [patch 09/54] kernel/hung_task convert hung_task_panic boot parameter to sysctl Andrew Morton
2020-06-08 4:40 ` [patch 10/54] tools/testing/selftests/sysctl/sysctl.sh: support CONFIG_TEST_SYSCTL=y Andrew Morton
2020-06-08 4:40 ` [patch 11/54] lib/test_sysctl: support testing of sysctl. boot parameter Andrew Morton
2020-06-08 4:40 ` [patch 12/54] kernel/watchdog.c: convert {soft/hard}lockup boot parameters to sysctl aliases Andrew Morton
2020-06-08 4:40 ` [patch 13/54] kernel/hung_task.c: introduce sysctl to print all traces when a hung task is detected Andrew Morton
2020-06-08 4:40 ` [patch 14/54] panic: add sysctl to dump all CPUs backtraces on oops event Andrew Morton
2020-06-08 4:40 ` [patch 15/54] kernel/sysctl.c: ignore out-of-range taint bits introduced via kernel.tainted Andrew Morton
2020-06-08 4:40 ` [patch 16/54] mm/gup.c: convert to use get_user_{page|pages}_fast_only() Andrew Morton
2020-06-08 4:40 ` [patch 17/54] mm/gup: update pin_user_pages.rst for "case 3" (mmu notifiers) Andrew Morton
2020-06-08 4:41 ` Andrew Morton [this message]
2020-06-08 4:41 ` [patch 19/54] mm/gup: frame_vector: convert get_user_pages() --> pin_user_pages() Andrew Morton
2020-06-08 4:41 ` [patch 20/54] mm/gup: documentation fix for pin_user_pages*() APIs Andrew Morton
2020-06-08 4:41 ` [patch 21/54] docs: mm/gup: pin_user_pages.rst: add a "case 5" Andrew Morton
2020-06-08 4:41 ` [patch 22/54] vhost: convert get_user_pages() --> pin_user_pages() Andrew Morton
2020-06-08 4:41 ` [patch 23/54] mm/mmap.c: add more sanity checks to get_unmapped_area() Andrew Morton
2020-06-08 4:41 ` [patch 24/54] mm/mmap.c: do not allow mappings outside of allowed limits Andrew Morton
2020-06-08 17:50 ` Linus Torvalds
2020-06-08 17:55 ` Linus Torvalds
2020-06-08 4:41 ` [patch 25/54] arm: fix the flush_icache_range arguments in set_fiq_handler Andrew Morton
2020-06-08 4:41 ` [patch 26/54] nds32: unexport flush_icache_page Andrew Morton
2020-06-08 4:41 ` [patch 27/54] powerpc: unexport flush_icache_user_range Andrew Morton
2020-06-08 4:41 ` [patch 28/54] unicore32: remove flush_cache_user_range Andrew Morton
2020-06-08 4:41 ` [patch 29/54] asm-generic: fix the inclusion guards for cacheflush.h Andrew Morton
2020-06-08 4:41 ` [patch 30/54] asm-generic: don't include <linux/mm.h> in cacheflush.h Andrew Morton
2020-06-08 4:41 ` [patch 31/54] asm-generic: improve the flush_dcache_page stub Andrew Morton
2020-06-08 4:41 ` [patch 32/54] alpha: use asm-generic/cacheflush.h Andrew Morton
2020-06-08 4:41 ` [patch 33/54] arm64: " Andrew Morton
2020-06-08 4:41 ` [patch 34/54] c6x: " Andrew Morton
2020-06-08 4:41 ` [patch 35/54] hexagon: " Andrew Morton
2020-06-08 4:42 ` [patch 36/54] ia64: " Andrew Morton
2020-06-08 4:42 ` [patch 37/54] microblaze: " Andrew Morton
2020-06-08 4:42 ` [patch 38/54] m68knommu: " Andrew Morton
2020-06-08 4:42 ` [patch 39/54] openrisc: " Andrew Morton
2020-06-08 4:42 ` [patch 40/54] powerpc: " Andrew Morton
2020-06-08 4:42 ` [patch 41/54] riscv: " Andrew Morton
2020-06-08 4:42 ` [patch 42/54] arm,sparc,unicore32: remove flush_icache_user_range Andrew Morton
2020-06-08 4:42 ` [patch 43/54] mm: rename flush_icache_user_range to flush_icache_user_page Andrew Morton
2020-06-08 4:42 ` [patch 44/54] asm-generic: add a flush_icache_user_range stub Andrew Morton
2020-06-08 4:42 ` [patch 45/54] sh: implement flush_icache_user_range Andrew Morton
2020-06-08 4:42 ` [patch 46/54] xtensa: " Andrew Morton
2020-06-08 4:42 ` [patch 47/54] arm: rename flush_cache_user_range to flush_icache_user_range Andrew Morton
2020-06-08 4:42 ` [patch 48/54] m68k: implement flush_icache_user_range Andrew Morton
2020-06-08 4:42 ` [patch 49/54] exec: only build read_code when needed Andrew Morton
2020-06-08 4:42 ` [patch 50/54] exec: use flush_icache_user_range in read_code Andrew Morton
2020-06-08 4:42 ` [patch 51/54] binfmt_flat: use flush_icache_user_range Andrew Morton
2020-06-08 4:42 ` [patch 52/54] nommu: use flush_icache_user_range in brk and mmap Andrew Morton
2020-06-08 4:42 ` [patch 53/54] module: move the set_fs hack for flush_icache_range to m68k Andrew Morton
2020-06-08 4:42 ` [patch 54/54] doc: cgroup: update note about conditions when oom killer is invoked Andrew Morton
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