commit 3dd9fe8c397df68086e6a1b2160573abbe944813
author KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Thu Jul 26 10:41:08 2007 -0700
committer Linus Torvalds <torvalds@woody.linux-foundation.org> Thu Jul 26 11:35:17 2007 -0700
tree 86dda41ade146e2a403151c7ba2f7e32a930bc63
parent dc386d4d1e98bb39fb967ee156cd456c802fc692

memory unplug: isolate_lru_page fix

release_pages() in mm/swap.c changes page_count() to be 0 without removing
PageLRU flag...

This means isolate_lru_page() can see a page, PageLRU() &&
page_count(page)==0..  This is BUG.  (get_page() will be called against
count=0 page.)

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>