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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 /mm/migrate.c
parent6213055f2c068b63078649457391ecea9b489ea3 (diff)
downloadop-kernel-dev-6d2329f8872f23e46a19d240930571510ce525eb.zip
op-kernel-dev-6d2329f8872f23e46a19d240930571510ce525eb.tar.gz
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 'mm/migrate.c')
-rw-r--r--mm/migrate.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index f7ee04a..99250ae 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -234,7 +234,7 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma,
goto unlock;
get_page(new);
- pte = pte_mkold(mk_pte(new, vma->vm_page_prot));
+ pte = pte_mkold(mk_pte(new, READ_ONCE(vma->vm_page_prot)));
if (pte_swp_soft_dirty(*ptep))
pte = pte_mksoft_dirty(pte);
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