From: Andrea Parri <andrea.parri@amarulasolutions.com>
To: linux-kernel@vger.kernel.org
Cc: Andrea Parri <andrea.parri@amarulasolutions.com>,
stable@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
Omar Sandoval <osandov@fb.com>, Ming Lei <ming.lei@redhat.com>,
linux-block@vger.kernel.org,
"Paul E. McKenney" <paulmck@linux.ibm.com>,
Peter Zijlstra <peterz@infradead.org>
Subject: [PATCH 3/4] sbitmap: fix improper use of smp_mb__before_atomic()
Date: Mon, 20 May 2019 19:23:57 +0200 [thread overview]
Message-ID: <1558373038-5611-4-git-send-email-andrea.parri@amarulasolutions.com> (raw)
In-Reply-To: <1558373038-5611-1-git-send-email-andrea.parri@amarulasolutions.com>
This barrier only applies to the read-modify-write operations; in
particular, it does not apply to the atomic_set() primitive.
Replace the barrier with an smp_mb().
Fixes: 6c0ca7ae292ad ("sbitmap: fix wakeup hang after sbq resize")
Cc: stable@vger.kernel.org
Reported-by: "Paul E. McKenney" <paulmck@linux.ibm.com>
Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrea Parri <andrea.parri@amarulasolutions.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Omar Sandoval <osandov@fb.com>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: linux-block@vger.kernel.org
Cc: "Paul E. McKenney" <paulmck@linux.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
---
lib/sbitmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/sbitmap.c b/lib/sbitmap.c
index 155fe38756ecf..4a7fc4915dfc6 100644
--- a/lib/sbitmap.c
+++ b/lib/sbitmap.c
@@ -435,7 +435,7 @@ static void sbitmap_queue_update_wake_batch(struct sbitmap_queue *sbq,
* to ensure that the batch size is updated before the wait
* counts.
*/
- smp_mb__before_atomic();
+ smp_mb();
for (i = 0; i < SBQ_WAIT_QUEUES; i++)
atomic_set(&sbq->ws[i].wait_cnt, 1);
}
--
2.7.4
prev parent reply other threads:[~2019-05-20 17:24 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1558373038-5611-1-git-send-email-andrea.parri@amarulasolutions.com>
2019-05-20 17:23 ` [PATCH 2/4] bio: fix improper use of smp_mb__before_atomic() Andrea Parri
2019-05-20 17:23 ` Andrea Parri [this message]
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