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authorAndrea Arcangeli <aarcange@redhat.com>2016-10-07 17:01:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-07 18:46:29 -0700
commit6d2329f8872f23e46a19d240930571510ce525eb (patch)
tree598cc5a8d764aa497570b359fc1328be5fa105cc /include
parent6213055f2c068b63078649457391ecea9b489ea3 (diff)
downloadlinux-6d2329f8872f23e46a19d240930571510ce525eb.tar.bz2
mm: vm_page_prot: update with WRITE_ONCE/READ_ONCE
vma->vm_page_prot is read lockless from the rmap_walk, it may be updated concurrently and this prevents the risk of reading intermediate values. Link: http://lkml.kernel.org/r/1474660305-19222-1-git-send-email-aarcange@redhat.com Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Jan Vorlicek <janvorli@microsoft.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mm.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 3e8807e0b9d2..040a04a88996 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1517,7 +1517,7 @@ static inline int pte_devmap(pte_t pte)
}
#endif
-int vma_wants_writenotify(struct vm_area_struct *vma);
+int vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot);
extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
spinlock_t **ptl);