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rmap: always add new vmas at the end

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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>
This commit is contained in:
Andrea Arcangeli 2010-08-09 17:19:08 -07:00 committed by Linus Torvalds
parent 5e549e989f
commit 26ba0cb63c
1 changed files with 1 additions and 1 deletions
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2
mm/rmap.c
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@ -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;
}