This bitop does not need to be atomic because it is performed when there will
be no references to the page (ie.  the page is being freed).
Signed-off-by: NNick Piggin <npiggin@suse.de>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>