tree 05d7615894131a368fc4943f641b11acdd2ae694
parent e236a166b2bc437769a9b8b5d19186a3761bde48
author Nick Piggin <npiggin@suse.de> 1137634947 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1137640817 -0800

[PATCH] mm: migration page refcounting fix

Migration code currently does not take a reference to target page
properly, so between unlocking the pte and trying to take a new
reference to the page with isolate_lru_page, anything could happen to
it.

Fix this by holding the pte lock until we get a chance to elevate the
refcount.

Other small cleanups while we're here.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>