| commit | 45726cb43d11b288c58243a26010f397054222f0 | |
| author | Nick Piggin <npiggin@suse.de> | |
| Tue, 16 Oct 2007 08:24:41 +0000 (16 01:24 -0700) | ||
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | |
| Tue, 16 Oct 2007 16:42:53 +0000 (16 09:42 -0700) | ||
| tree | ae1804a34f314be18865add063d660cf783e45be | treesnapshot (tar.gz zip) |
| parent | 001281881067a5998384c6669bc8dbbbab8456c4 | commitdiff |
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>
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>
| mm/filemap.c | diffblobblamehistory |