tree c060c9b3e9fd61507687a419a94c659425de57e4
parent d0e9fe1758f222f13ec893f856552d81a10d266d
author Linus Torvalds <torvalds@linux-foundation.org> 1270938150 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1271120051 -0700

vma_adjust: fix the copying of anon_vma chains

When we move the boundaries between two vma's due to things like
mprotect, we need to make sure that the anon_vma of the pages that got
moved from one vma to another gets properly copied around.  And that was
not always the case, in this rather hard-to-follow code sequence.

Clarify the code, and fix it so that it copies the anon_vma from the
right source.

Reviewed-by: Rik van Riel <riel@redhat.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Tested-by: Borislav Petkov <bp@alien8.de> [ "Yeah, not so much this one either" ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>