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charset="utf-8" Use `clear_and_wake_up_bit()` in `unlock_buffer()`, since the helper was introduced in 'commit 8236b0ae31c83 ("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 4e857c58efeb9 ("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 --- fs/buffer.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/fs/buffer.c b/fs/buffer.c index b0b3792b1496..4348b240bd97 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -74,9 +74,7 @@ EXPORT_SYMBOL(__lock_buffer); =20 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); =20 --=20 2.53.0 From nobody Sun May 24 22:35:50 2026 Received: from relay1-s.mailbaby.net (relay1-s.mailbaby.net [67.217.63.253]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5FB963546E8 for ; Wed, 20 May 2026 20:11:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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Received: from [170.254.153.136] (port=33942 helo=guidai) by nyc3000-r.dnsiaas.com with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.99.2) (envelope-from ) id 1wPnAy-0000000FeZT-3Ups; Wed, 20 May 2026 16:05:54 -0400 Date: Wed, 20 May 2026 17:05:46 -0300 From: Agatha Isabelle Moreira To: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Theodore Ts'o , Jan Kara , shuo chen <1289151713@qq.com>, linux-kernel-mentees@lists.linux.dev, shuah@kernel.org, patch-reply@agatha.dev Subject: [PATCH 2/2] fs: jbd2: use clear_and_wake_up_bit() in journal_end_buffer_io_sync() Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-AuthUser: me@agatha.dev Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Use `clear_and_wake_up_bit()` in `journal_end_buffer_io_sync()`, since the helper was introduced in 'commit 8236b0ae31c83 ("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 first implemented to avoid bugs caused by forgetting to call `wake_up_bit()` after `clear_bit_unlock()`. Since `journal_end_buffer_io_sync()` was first introduced by 'commit 470decc613ab2 ("jbd2: initial copy of files from jbd")' and last modified in this operation by 'commit 4e857c58efeb9 ("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 --- fs/jbd2/commit.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c index 8cf61e7185c4..b647fde76e49 100644 --- a/fs/jbd2/commit.c +++ b/fs/jbd2/commit.c @@ -39,9 +39,7 @@ static void journal_end_buffer_io_sync(struct buffer_head= *bh, int uptodate) else clear_buffer_uptodate(bh); if (orig_bh) { - clear_bit_unlock(BH_Shadow, &orig_bh->b_state); - smp_mb__after_atomic(); - wake_up_bit(&orig_bh->b_state, BH_Shadow); + clear_and_wake_up_bit(BH_Shadow, &orig_bh->b_state); } unlock_buffer(bh); } --=20 2.53.0