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| author | Michel Lespinasse <walken@google.com> | 2020-06-08 21:33:44 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-09 09:39:14 -0700 |
| commit | 42fc541404f249778e752ab39c8bc25fcb2dbe1e (patch) | |
| tree | b88977e7c8f7797b8e7f910c327406b766ddaa20 /mm/pagewalk.c | |
| parent | 14c3656b7284a8649496584869e8c6642ec1abbb (diff) | |
| download | linux-42fc541404f249778e752ab39c8bc25fcb2dbe1e.tar.gz linux-42fc541404f249778e752ab39c8bc25fcb2dbe1e.tar.bz2 linux-42fc541404f249778e752ab39c8bc25fcb2dbe1e.zip | |
mmap locking API: add mmap_assert_locked() and mmap_assert_write_locked()
Add new APIs to assert that mmap_sem is held.
Using this instead of rwsem_is_locked and lockdep_assert_held[_write]
makes the assertions more tolerant of future changes to the lock type.
Signed-off-by: Michel Lespinasse <walken@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Laurent Dufour <ldufour@linux.ibm.com>
Cc: Liam Howlett <Liam.Howlett@oracle.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ying Han <yinghan@google.com>
Link: http://lkml.kernel.org/r/20200520052908.204642-10-walken@google.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/pagewalk.c')
| -rw-r--r-- | mm/pagewalk.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/mm/pagewalk.c b/mm/pagewalk.c index 928df1638c30..3b452aa05cd0 100644 --- a/mm/pagewalk.c +++ b/mm/pagewalk.c @@ -395,7 +395,7 @@ int walk_page_range(struct mm_struct *mm, unsigned long start, if (!walk.mm) return -EINVAL; - lockdep_assert_held(&walk.mm->mmap_sem); + mmap_assert_locked(walk.mm); vma = find_vma(walk.mm, start); do { @@ -453,7 +453,7 @@ int walk_page_range_novma(struct mm_struct *mm, unsigned long start, if (start >= end || !walk.mm) return -EINVAL; - lockdep_assert_held(&walk.mm->mmap_sem); + mmap_assert_locked(walk.mm); return __walk_page_range(start, end, &walk); } @@ -472,7 +472,7 @@ int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops, if (!walk.mm) return -EINVAL; - lockdep_assert_held(&walk.mm->mmap_sem); + mmap_assert_locked(walk.mm); err = walk_page_test(vma->vm_start, vma->vm_end, &walk); if (err > 0) |