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From: Jens Axboe <axboe@kernel.dk>
To: io-uring@vger.kernel.org
Cc: linux-block@vger.kernel.org, asml.silence@gmail.com,
	jannh@google.com, Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 1/3] io_uring: make io_cqring_events() take 'ctx' as argument
Date: Wed,  6 Nov 2019 16:53:05 -0700	[thread overview]
Message-ID: <20191106235307.32196-2-axboe@kernel.dk> (raw)
In-Reply-To: <20191106235307.32196-1-axboe@kernel.dk>

The rings can be derived from the ctx, and we need the ctx there for
a future change.

No functional changes in this patch.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/io_uring.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index b0dd8d322360..36ca7bc38ebf 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -859,8 +859,10 @@ static void io_put_req(struct io_kiocb *req, struct io_kiocb **nxtptr)
 	}
 }
 
-static unsigned io_cqring_events(struct io_rings *rings)
+static unsigned io_cqring_events(struct io_ring_ctx *ctx)
 {
+	struct io_rings *rings = ctx->rings;
+
 	/* See comment at the top of this file */
 	smp_rmb();
 	return READ_ONCE(rings->cq.tail) - READ_ONCE(rings->cq.head);
@@ -1016,7 +1018,7 @@ static int __io_iopoll_check(struct io_ring_ctx *ctx, unsigned *nr_events,
 		 * If we do, we can potentially be spinning for commands that
 		 * already triggered a CQE (eg in error).
 		 */
-		if (io_cqring_events(ctx->rings))
+		if (io_cqring_events(ctx))
 			break;
 
 		/*
@@ -3064,7 +3066,7 @@ static inline bool io_should_wake(struct io_wait_queue *iowq)
 	 * started waiting. For timeouts, we always want to return to userspace,
 	 * regardless of event count.
 	 */
-	return io_cqring_events(ctx->rings) >= iowq->to_wait ||
+	return io_cqring_events(ctx) >= iowq->to_wait ||
 			atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts;
 }
 
@@ -3099,7 +3101,7 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
 	struct io_rings *rings = ctx->rings;
 	int ret = 0;
 
-	if (io_cqring_events(rings) >= min_events)
+	if (io_cqring_events(ctx) >= min_events)
 		return 0;
 
 	if (sig) {
-- 
2.24.0


  reply	other threads:[~2019-11-06 23:53 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-06 23:53 [PATCHSET v2 0/3] io_uring CQ ring backpressure Jens Axboe
2019-11-06 23:53 ` Jens Axboe [this message]
2019-11-06 23:53 ` [PATCH 2/3] io_uring: pass in io_kiocb to fill/add CQ handlers Jens Axboe
2019-11-07  9:53   ` Pavel Begunkov
2019-11-07 13:16     ` Jens Axboe
2019-11-06 23:53 ` [PATCH 3/3] io_uring: add support for backlogged CQ ring Jens Axboe
2019-11-07 16:00 [PATCHSET v3 0/3] io_uring CQ ring backpressure Jens Axboe
2019-11-07 16:00 ` [PATCH 1/3] io_uring: make io_cqring_events() take 'ctx' as argument Jens Axboe

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