linux-kernel - [PATCH] md/bitmap: Use 'atomic_inc_return' instead of hand-writing it

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Message-Id: <bb63b5d4e985be4bafa7a1922e6992fa81b399c4.1627042861.git.christophe.jaillet@wanadoo.fr>
Date:   Fri, 23 Jul 2021 14:21:57 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     song@...nel.org, linux-raid@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] md/bitmap: Use 'atomic_inc_return' instead of hand-writing it

'atomic_inc/atomic_read' is equivalent to 'atomic_inc_return' which is
less verbose.
So use the later.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
First time a play with atomic functions, so apologies if I misunderstood
something
---
 drivers/md/md-bitmap.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index e29c6298ef5c..9d47a2ca1cf3 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1396,8 +1396,8 @@ int md_bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long s
 
 	if (behind) {
 		int bw;
-		atomic_inc(&bitmap->behind_writes);
-		bw = atomic_read(&bitmap->behind_writes);
+
+		bw = atomic_inc_return(&bitmap->behind_writes);
 		if (bw > bitmap->behind_writes_used)
 			bitmap->behind_writes_used = bw;
 
-- 
2.30.2