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Commit 26ba0cb6 authored by Andrea Arcangeli's avatar Andrea Arcangeli Committed by Linus Torvalds
Browse files

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: default avatarAndrea Arcangeli <aarcange@redhat.com>
Signed-off-by: default avatarRik van Riel <riel@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 5e549e98

mm/rmap.c

+1 −1
Original line number Diff line number Diff line
@@ -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;

		}