linux-kernel - Re: [PATCH -next 3/3] block, bfq: remove useless parameter for bfq_add/del_bfqq

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Date:   Wed, 17 Aug 2022 13:56:04 +0200
From:   Jan Kara <jack@...e.cz>
To:     Yu Kuai <yukuai1@...weicloud.com>
Cc:     jack@...e.cz, axboe@...nel.dk, paolo.valente@...aro.org,
        cgroups@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, yukuai3@...wei.com,
        yi.zhang@...wei.com
Subject: Re: [PATCH -next 3/3] block, bfq: remove useless parameter for
 bfq_add/del_bfqq_busy()

On Tue 16-08-22 09:56:31, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@...wei.com>
> 
> 'bfqd' can be accessed through 'bfqq->bfqd', there is no need to pass
> it as a parameter separately.
> 
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>

I agree. That also seemed a bit strange to me in bfq code. Feel free to
add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  block/bfq-iosched.c | 8 ++++----
>  block/bfq-iosched.h | 5 ++---
>  block/bfq-wf2q.c    | 9 ++++++---
>  3 files changed, 12 insertions(+), 10 deletions(-)
> 
> diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
> index f39067389b2b..7ea427817f7f 100644
> --- a/block/bfq-iosched.c
> +++ b/block/bfq-iosched.c
> @@ -1925,7 +1925,7 @@ static void bfq_bfqq_handle_idle_busy_switch(struct bfq_data *bfqd,
>  	bfqq->service_from_backlogged = 0;
>  	bfq_clear_bfqq_softrt_update(bfqq);
>  
> -	bfq_add_bfqq_busy(bfqd, bfqq);
> +	bfq_add_bfqq_busy(bfqq);
>  
>  	/*
>  	 * Expire in-service queue if preemption may be needed for
> @@ -2419,7 +2419,7 @@ static void bfq_remove_request(struct request_queue *q,
>  		bfqq->next_rq = NULL;
>  
>  		if (bfq_bfqq_busy(bfqq) && bfqq != bfqd->in_service_queue) {
> -			bfq_del_bfqq_busy(bfqd, bfqq, false);
> +			bfq_del_bfqq_busy(bfqq, false);
>  			/*
>  			 * bfqq emptied. In normal operation, when
>  			 * bfqq is empty, bfqq->entity.service and
> @@ -3098,7 +3098,7 @@ void bfq_release_process_ref(struct bfq_data *bfqd, struct bfq_queue *bfqq)
>  	 */
>  	if (bfq_bfqq_busy(bfqq) && RB_EMPTY_ROOT(&bfqq->sort_list) &&
>  	    bfqq != bfqd->in_service_queue)
> -		bfq_del_bfqq_busy(bfqd, bfqq, false);
> +		bfq_del_bfqq_busy(bfqq, false);
>  
>  	bfq_reassign_last_bfqq(bfqq, NULL);
>  
> @@ -3908,7 +3908,7 @@ static bool __bfq_bfqq_expire(struct bfq_data *bfqd, struct bfq_queue *bfqq,
>  			 */
>  			bfqq->budget_timeout = jiffies;
>  
> -		bfq_del_bfqq_busy(bfqd, bfqq, true);
> +		bfq_del_bfqq_busy(bfqq, true);
>  	} else {
>  		bfq_requeue_bfqq(bfqd, bfqq, true);
>  		/*
> diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h
> index f81ab3c8fa3c..64ee618064ba 100644
> --- a/block/bfq-iosched.h
> +++ b/block/bfq-iosched.h
> @@ -1080,9 +1080,8 @@ void bfq_deactivate_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq,
>  void bfq_activate_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq);
>  void bfq_requeue_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq,
>  		      bool expiration);
> -void bfq_del_bfqq_busy(struct bfq_data *bfqd, struct bfq_queue *bfqq,
> -		       bool expiration);
> -void bfq_add_bfqq_busy(struct bfq_data *bfqd, struct bfq_queue *bfqq);
> +void bfq_del_bfqq_busy(struct bfq_queue *bfqq, bool expiration);
> +void bfq_add_bfqq_busy(struct bfq_queue *bfqq);
>  
>  /* --------------- end of interface of B-WF2Q+ ---------------- */
>  
> diff --git a/block/bfq-wf2q.c b/block/bfq-wf2q.c
> index 983413cdefad..8fc3da4c23bb 100644
> --- a/block/bfq-wf2q.c
> +++ b/block/bfq-wf2q.c
> @@ -1651,9 +1651,10 @@ void bfq_requeue_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq,
>   * the service tree. As a special case, it can be invoked during an
>   * expiration.
>   */
> -void bfq_del_bfqq_busy(struct bfq_data *bfqd, struct bfq_queue *bfqq,
> -		       bool expiration)
> +void bfq_del_bfqq_busy(struct bfq_queue *bfqq, bool expiration)
>  {
> +	struct bfq_data *bfqd = bfqq->bfqd;
> +
>  	bfq_log_bfqq(bfqd, bfqq, "del from busy");
>  
>  	bfq_clear_bfqq_busy(bfqq);
> @@ -1674,8 +1675,10 @@ void bfq_del_bfqq_busy(struct bfq_data *bfqd, struct bfq_queue *bfqq,
>  /*
>   * Called when an inactive queue receives a new request.
>   */
> -void bfq_add_bfqq_busy(struct bfq_data *bfqd, struct bfq_queue *bfqq)
> +void bfq_add_bfqq_busy(struct bfq_queue *bfqq)
>  {
> +	struct bfq_data *bfqd = bfqq->bfqd;
> +
>  	bfq_log_bfqq(bfqd, bfqq, "add to busy");
>  
>  	bfq_activate_bfqq(bfqd, bfqq);
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR