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>
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d0e9fe17
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