linux-kernel - Re: [PATCH -next 4/8] block, bfq: don't declare 'bfqd' as type 'void *' in bfq

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Date:   Thu, 19 May 2022 13:01:32 +0200
From:   Jan Kara <jack@...e.cz>
To:     Yu Kuai <yukuai3@...wei.com>
Cc:     jack@...e.cz, paolo.valente@...aro.org, axboe@...nel.dk,
        tj@...nel.org, linux-block@...r.kernel.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        yi.zhang@...wei.com
Subject: Re: [PATCH -next 4/8] block, bfq: don't declare 'bfqd' as type 'void
 *' in bfq_group

On Sat 14-05-22 17:05:18, Yu Kuai wrote:
> Prevent unnecessary format conversion for bfqg->bfqd in multiple
> places.
> 
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>

Yeah, this was annoying me as well :) Feel free to add:

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

								Honza

> ---
>  block/bfq-cgroup.c  | 2 +-
>  block/bfq-iosched.h | 2 +-
>  block/bfq-wf2q.c    | 8 +++-----
>  3 files changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
> index 4d516879d9fa..b4e39ab4ad17 100644
> --- a/block/bfq-cgroup.c
> +++ b/block/bfq-cgroup.c
> @@ -224,7 +224,7 @@ void bfqg_stats_update_io_add(struct bfq_group *bfqg, struct bfq_queue *bfqq,
>  {
>  	blkg_rwstat_add(&bfqg->stats.queued, op, 1);
>  	bfqg_stats_end_empty_time(&bfqg->stats);
> -	if (!(bfqq == ((struct bfq_data *)bfqg->bfqd)->in_service_queue))
> +	if (!(bfqq == bfqg->bfqd->in_service_queue))
>  		bfqg_stats_set_start_group_wait_time(bfqg, bfqq_group(bfqq));
>  }
>  
> diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h
> index bc54b9824b1e..d57e4848f57f 100644
> --- a/block/bfq-iosched.h
> +++ b/block/bfq-iosched.h
> @@ -894,7 +894,7 @@ struct bfq_group {
>  	struct bfq_entity entity;
>  	struct bfq_sched_data sched_data;
>  
> -	void *bfqd;
> +	struct bfq_data *bfqd;
>  
>  	struct bfq_queue *async_bfqq[2][IOPRIO_NR_LEVELS];
>  	struct bfq_queue *async_idle_bfqq;
> diff --git a/block/bfq-wf2q.c b/block/bfq-wf2q.c
> index c58568a4b009..15b97687493a 100644
> --- a/block/bfq-wf2q.c
> +++ b/block/bfq-wf2q.c
> @@ -234,9 +234,8 @@ static void bfq_inc_active_entities(struct bfq_entity *entity)
>  {
>  	struct bfq_sched_data *sd = entity->sched_data;
>  	struct bfq_group *bfqg = container_of(sd, struct bfq_group, sched_data);
> -	struct bfq_data *bfqd = (struct bfq_data *)bfqg->bfqd;
>  
> -	if (bfqg != bfqd->root_group)
> +	if (bfqg != bfqg->bfqd->root_group)
>  		bfqg->active_entities++;
>  }
>  
> @@ -244,9 +243,8 @@ static void bfq_dec_active_entities(struct bfq_entity *entity)
>  {
>  	struct bfq_sched_data *sd = entity->sched_data;
>  	struct bfq_group *bfqg = container_of(sd, struct bfq_group, sched_data);
> -	struct bfq_data *bfqd = (struct bfq_data *)bfqg->bfqd;
>  
> -	if (bfqg != bfqd->root_group)
> +	if (bfqg != bfqg->bfqd->root_group)
>  		bfqg->active_entities--;
>  }
>  
> @@ -741,7 +739,7 @@ __bfq_entity_update_weight_prio(struct bfq_service_tree *old_st,
>  		else {
>  			sd = entity->my_sched_data;
>  			bfqg = container_of(sd, struct bfq_group, sched_data);
> -			bfqd = (struct bfq_data *)bfqg->bfqd;
> +			bfqd = bfqg->bfqd;
>  		}
>  #endif
>  
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR