tree ae1804a34f314be18865add063d660cf783e45be
parent 001281881067a5998384c6669bc8dbbbab8456c4
author Nick Piggin <npiggin@suse.de> 1192523081 -0700
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1192552973 -0700

mm: improve find_lock_page

find_lock_page does not need to recheck ->index because if the page is in the
right mapping then the index must be the same.  Also, tree_lock does not need
to be retaken after the page is locked in order to test that ->mapping has not
changed, because holding the page lock pins its mapping.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>