linux-kernel - Re: [PATCH] [v2] blk-mq-tag: make blk_mq_tag

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Date:   Thu, 10 Dec 2020 06:21:07 +0000
From:   Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>
To:     Xianting Tian <tian.xianting@....com>,
        "axboe@...nel.dk" <axboe@...nel.dk>
CC:     "ming.lei@...hat.com" <ming.lei@...hat.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [v2] blk-mq-tag: make blk_mq_tag_busy() return void

On 12/9/20 22:06, Xianting Tian wrote:
> As no one cares about the return value of blk_mq_tag_busy() and
> __blk_mq_tag_busy(), so make them return void.
>
> Other change is to simplify blk_mq_tag_idle().
>
> Signed-off-by: Xianting Tian <tian.xianting@....com>
> Reviewed-by: Ming Lei <ming.lei@...hat.com>
> ---
>  block/blk-mq-tag.c |  4 ++--
>  block/blk-mq-tag.h | 16 ++++++----------
>  2 files changed, 8 insertions(+), 12 deletions(-)
>
> diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
> index 9c92053e7..21ff7d156 100644
> --- a/block/blk-mq-tag.c
> +++ b/block/blk-mq-tag.c
> @@ -21,7 +21,7 @@
>   * to get tag when first time, the other shared-tag users could reserve
>   * budget for it.
>   */
> -bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
> +void __blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
>  {
>  	if (blk_mq_is_sbitmap_shared(hctx->flags)) {
>  		struct request_queue *q = hctx->queue;
> @@ -36,7 +36,7 @@ bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
>  			atomic_inc(&hctx->tags->active_queues);
>  	}
>  
> -	return true;
> +	return;
if above return is the last statement then you need to remove that
instead of using return with no value.

Also, please add the version history.