diff options
| author | Nick Piggin <npiggin@suse.de> | 2008-10-18 20:27:00 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-20 08:52:32 -0700 |
| commit | 51b07fc3c5c830bb49c80fc5eac041e1f66a72e7 (patch) | |
| tree | 7d01d39f5eb5ac601d95c1e133492bd83135af6c /fs/buffer.c | |
| parent | 8413ac9d8c9a1366a4f57880723126cd24e5a5c3 (diff) | |
| download | lwn-51b07fc3c5c830bb49c80fc5eac041e1f66a72e7.tar.gz lwn-51b07fc3c5c830bb49c80fc5eac041e1f66a72e7.zip | |
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>
Diffstat (limited to 'fs/buffer.c')
| -rw-r--r-- | fs/buffer.c | 3 |
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); } |