path: root/mm/rmap.c
diff options
authorAndrea Arcangeli <aarcange@redhat.com>2010-08-09 17:19:08 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-09 20:44:58 -0700
commit26ba0cb63cb8df4e45394227f33c938920b11b88 (patch)
tree131b785dc7fb0102ee4fc4f56a1ae948b9861501 /mm/rmap.c
parent5e549e989f94de0596b8149a90e0088e7d4d7c97 (diff)
rmap: always add new vmas at the end
Make sure to always add new VMAs at the end of the list. This is important so rmap_walk does not miss a VMA that was created during the rmap_walk. The old code got this right most of the time due to luck, but was buggy when anon_vma_prepare reused a mergeable anon_vma. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/rmap.c')
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/rmap.c b/mm/rmap.c
index 07e9814c7a41..dce74a9efdd6 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -147,7 +147,7 @@ int anon_vma_prepare(struct vm_area_struct *vma)
avc->anon_vma = anon_vma;
avc->vma = vma;
list_add(&avc->same_vma, &vma->anon_vma_chain);
- list_add(&avc->same_anon_vma, &anon_vma->head);
+ list_add_tail(&avc->same_anon_vma, &anon_vma->head);
allocated = NULL;
avc = NULL;

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