linux-kernel - [PATCH 13/14] ext4: use atomic_dec_not

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Date:   Mon, 30 Jan 2017 19:48:39 +0100
From:   Fabian Frederick <fabf@...net.be>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, tytso@....edu,
        linux-ext4@...r.kernel.org, Fabian Frederick <fabf@...net.be>
Subject: [PATCH 13/14] ext4: use atomic_dec_not_zero()

instead of atomic_add_unless(value, -1, 0)

Signed-off-by: Fabian Frederick <fabf@...net.be>
---
 fs/ext4/ext4.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 164a2e0..3184c25 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2916,7 +2916,7 @@ static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
 		 * We're able to grab the lock right away, so drop the
 		 * lock contention counter.
 		 */
-		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
+		atomic_dec_not_zero(&EXT4_SB(sb)->s_lock_busy);
 	else {
 		/*
 		 * The lock is busy, so bump the contention counter,
-- 
2.9.3