fs: buffer lock use lock bitops

trylock_buffer and unlock_buffer open and close a critical section.
Hence, we can use the lock bitops to get the desired memory ordering.

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>

1 files changed, 1 insertions, 2 deletions

diff --git a/fs/buffer.c b/fs/buffer.c
index ac78d4c19b3b..6569fda5cfed 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -76,8 +76,7 @@ EXPORT_SYMBOL(__lock_buffer);
 
 void unlock_buffer(struct buffer_head *bh)
 {
-        smp_mb__before_clear_bit();
-        clear_buffer_locked(bh);
+        clear_bit_unlock(BH_Lock, &bh->b_state);
         smp_mb__after_clear_bit();
         wake_up_bit(&bh->b_state, BH_Lock);
 }