From: "Stefan Bühler" <source@stbuehler.de>
To: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: [PATCH barrier cleanup v1 4/7] io_uring: remove unnecessary barrier after updating SQ head
Date: Wed, 24 Apr 2019 23:54:19 +0200 [thread overview]
Message-ID: <20190424215422.7404-4-source@stbuehler.de> (raw)
In-Reply-To: <20190424215422.7404-1-source@stbuehler.de>
There is no operation afterwards to order with.
Signed-off-by: Stefan Bühler <source@stbuehler.de>
---
fs/io_uring.c | 6 ------
1 file changed, 6 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 2c101230df71..31357cc0e8e6 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1795,12 +1795,6 @@ static void io_commit_sqring(struct io_ring_ctx *ctx)
* write new data to them.
*/
smp_store_release(&ring->r.head, ctx->cached_sq_head);
-
- /*
- * write side barrier of head update, app has read side. See
- * comment at the top of this file
- */
- smp_wmb();
}
}
--
2.20.1
next prev parent reply other threads:[~2019-04-24 21:54 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-14 16:44 io_uring memory ordering (and broken queue-is-full checks) Stefan Bühler
2019-04-17 15:02 ` Jens Axboe
2019-04-19 9:29 ` Stefan Bühler
2019-04-19 9:57 ` [PATCH v1 1/3] io_uring: fix race condition reading SQ entries Stefan Bühler
2019-04-19 9:57 ` [PATCH v1 2/3] io_uring: fix race condition when sq threads goes sleeping Stefan Bühler
2019-04-19 9:57 ` [PATCH v1 3/3] io_uring: fix poll full SQ detection Stefan Bühler
2019-04-22 17:04 ` io_uring memory ordering (and broken queue-is-full checks) Jens Axboe
2019-04-24 21:54 ` [PATCH barrier cleanup v1 1/7] io_uring: fix notes on barriers Stefan Bühler
2019-04-24 21:54 ` [PATCH barrier cleanup v1 2/7] io_uring: remove unnecessary barrier before wq_has_sleeper Stefan Bühler
2019-04-24 21:54 ` [PATCH barrier cleanup v1 3/7] io_uring: remove unnecessary barrier before reading cq head Stefan Bühler
2019-04-24 21:54 ` Stefan Bühler [this message]
2019-04-24 21:54 ` [PATCH barrier cleanup v1 5/7] io_uring: remove unnecessary barrier before reading SQ tail Stefan Bühler
2019-04-24 21:54 ` [PATCH barrier cleanup v1 6/7] io_uring: remove unnecessary barrier after incrementing dropped counter Stefan Bühler
2019-04-24 21:54 ` [PATCH barrier cleanup v1 7/7] io_uring: remove unnecessary barrier after unsetting IORING_SQ_NEED_WAKEUP Stefan Bühler
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