linux-kernel - Re: [PATCH v3 7/8] block, bfq: remove unnecessary goto tag in bfq_dispatch_rq_from

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Message-ID: <d4613092-e29d-574e-9d1e-4f5a3eca8b56@opensource.wdc.com>
Date:   Tue, 3 Jan 2023 11:33:48 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Kemeng Shi <shikemeng@...weicloud.com>, jack@...e.com,
        paolo.valente@...aro.org, axboe@...nel.dk
Cc:     hch@....de, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 7/8] block, bfq: remove unnecessary goto tag in
 bfq_dispatch_rq_from_bfqq

On 1/3/23 18:53, Kemeng Shi wrote:
> We jump to tag only for returning current rq. Return directly to
> remove this tag.
> 
> Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
> ---
>  block/bfq-iosched.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
> index 9ff424c78e9b..a11be312ac77 100644
> --- a/block/bfq-iosched.c
> +++ b/block/bfq-iosched.c
> @@ -4966,7 +4966,7 @@ static struct request *bfq_dispatch_rq_from_bfqq(struct bfq_data *bfqd,
>  	bfq_dispatch_remove(bfqd->queue, rq);
>  
>  	if (bfqq != bfqd->in_service_queue)
> -		goto return_rq;
> +		return rq;
>  
>  	/*
>  	 * If weight raising has to terminate for bfqq, then next
> @@ -4986,12 +4986,9 @@ static struct request *bfq_dispatch_rq_from_bfqq(struct bfq_data *bfqd,
>  	 * belongs to CLASS_IDLE and other queues are waiting for
>  	 * service.
>  	 */
> -	if (!(bfq_tot_busy_queues(bfqd) > 1 && bfq_class_idle(bfqq)))
> -		goto return_rq;
> +	if (bfq_tot_busy_queues(bfqd) > 1 && bfq_class_idle(bfqq))
> +		bfq_bfqq_expire(bfqd, bfqq, false, BFQQE_BUDGET_EXHAUSTED);
>  
> -	bfq_bfqq_expire(bfqd, bfqq, false, BFQQE_BUDGET_EXHAUSTED);
> -
> -return_rq:
>  	return rq;
>  }
>  

Looks OK to me.

Reviewed-by: Damien Le Moal <damien.lemoal@...nsource.wdc.com>

-- 
Damien Le Moal
Western Digital Research