Make "unlock_buffer()" use the optimized "smp_mb__after_clear_bit()".

"clear_buffer_locked()" is just a nicer name for a clear-bit, and
on x86 (and others) we don't need any expensive memory barriers
after that.

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/buffer.c b/fs/buffer.c
index cb277370c9cc..0d1cc3e09aee 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -76,7 +76,7 @@ EXPORT_SYMBOL(__lock_buffer);
 void fastcall unlock_buffer(struct buffer_head *bh)
 {
 	clear_buffer_locked(bh);
-	smp_mb();
+	smp_mb__after_clear_bit();
 	wake_up_bit(&bh->b_state, BH_Lock);
 }