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fs: buffer: use clear_and_wake_up_bit() in unlock_buffer()

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Use `clear_and_wake_up_bit()` in `unlock_buffer()`, since the helper was
introduced in 'commit 8236b0ae31 ("bdi: wake up concurrent
wb_shutdown() callers.")' as a generic way of doing the same sequence of
operations:
       	clear_bit_unlock();
	smp_mb__after_atomic();
	wake_up_bit();

The helper was implemented to avoid bugs caused by forgetting to call
`wake_up_bit()` after `clear_bit_unlock()`.

Since `unlock_buffer()` predates git and was last modified in
'commit 4e857c58ef ("arch: Mass conversion of smp_mb__*()")', years
before `clear_and_wake_up_bit()`, it still uses the open-coded sequence.

Replace the open-coded sequence with the helper to avoid duplicate code
and reduce code paths to maintain.

Suggested-by: shuo chen <1289151713@qq.com>
Link: https://lore.kernel.org/kernelnewbies/agzoqV835-co4kAN@guidai/T/#t
Signed-off-by: Agatha Isabelle Moreira <code@agatha.dev>
Link: https://patch.msgid.link/ag4SD-mkmn5IbuN7@guidai
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Agatha Isabelle Moreira 2026-05-20 16:58:16 -03:00 committed by Christian Brauner
parent ec3f4e0443
commit 0432b89f61
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1 changed files with 1 additions and 3 deletions
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fs/buffer.c
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@ -74,9 +74,7 @@ EXPORT_SYMBOL(__lock_buffer);
void unlock_buffer(struct buffer_head *bh)
{
clear_bit_unlock(BH_Lock, &bh->b_state);
smp_mb__after_atomic();
wake_up_bit(&bh->b_state, BH_Lock);
clear_and_wake_up_bit(BH_Lock, &bh->b_state);
}
EXPORT_SYMBOL(unlock_buffer);