linux-kernel - Re: [PATCH v2 3/8] io_uring: refactor __io_cq_unlock_post

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Message-ID: <7fd26d16-39da-4880-9b91-dde7b1a15c97@gmail.com>
Date:   Thu, 6 Apr 2023 15:23:50 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     io-uring@...r.kernel.org
Cc:     Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/8] io_uring: refactor __io_cq_unlock_post_flush()

On 4/6/23 14:20, Pavel Begunkov wrote:
> Instead of smp_mb() + __io_cqring_wake() in __io_cq_unlock_post_flush()
> use equivalent io_cqring_wake(). With that we can clean it up further
> and remove __io_cqring_wake().

I didn't notice patches 3 and 7 have the same subj. This one
should've better been called refactor io_cqring_wake().


> Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
> ---
>   io_uring/io_uring.c |  6 ++----
>   io_uring/io_uring.h | 11 ++---------
>   2 files changed, 4 insertions(+), 13 deletions(-)
> 
> diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
> index fb7215b543cd..d4ac62de2113 100644
> --- a/io_uring/io_uring.c
> +++ b/io_uring/io_uring.c
> @@ -640,10 +640,8 @@ static inline void __io_cq_unlock_post_flush(struct io_ring_ctx *ctx)
>   	 * it will re-check the wakeup conditions once we return we can safely
>   	 * skip waking it up.
>   	 */
> -	if (!(ctx->flags & IORING_SETUP_DEFER_TASKRUN)) {
> -		smp_mb();
> -		__io_cqring_wake(ctx);
> -	}
> +	if (!(ctx->flags & IORING_SETUP_DEFER_TASKRUN))
> +		io_cqring_wake(ctx);
>   }
>   


-- 
Pavel Begunkov