mm, rmap: Add yet more comments to page_get_anon_vma/page_lock_anon_vma
Inspired by an analysis from Hugh on why again all this doesn't explode in our face. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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