linux-kernel - Re: [PATCH 2/3] block: Stop abusing rq->csd.list in blk-softirq

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Message-ID: <20131218205058.GC13685@quack.suse.cz>
Date:	Wed, 18 Dec 2013 21:50:58 +0100
From:	Jan Kara <jack@...e.cz>
To:	Jens Axboe <jaxboe@...ionio.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, Jan Kara <jack@...e.cz>
Subject: Re: [PATCH 2/3] block: Stop abusing rq->csd.list in blk-softirq

On Wed 18-12-13 18:23:36, Jan Kara wrote:
> Abusing rq->csd.list for a list of requests to complete is rather ugly.
> Especially since using queuelist should be safe and much cleaner.
  This is the correct patch 2/3.

								Honza
> 
> Signed-off-by: Jan Kara <jack@...e.cz>
> ---
>  block/blk-softirq.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/block/blk-softirq.c b/block/blk-softirq.c
> index 57790c1a97eb..7ea5534096d5 100644
> --- a/block/blk-softirq.c
> +++ b/block/blk-softirq.c
> @@ -30,8 +30,8 @@ static void blk_done_softirq(struct softirq_action *h)
>  	while (!list_empty(&local_list)) {
>  		struct request *rq;
>  
> -		rq = list_entry(local_list.next, struct request, csd.list);
> -		list_del_init(&rq->csd.list);
> +		rq = list_entry(local_list.next, struct request, queuelist);
> +		list_del_init(&rq->queuelist);
>  		rq->q->softirq_done_fn(rq);
>  	}
>  }
> @@ -45,9 +45,9 @@ static void trigger_softirq(void *data)
>  
>  	local_irq_save(flags);
>  	list = this_cpu_ptr(&blk_cpu_done);
> -	list_add_tail(&rq->csd.list, list);
> +	list_add_tail(&rq->queuelist, list);
>  
> -	if (list->next == &rq->csd.list)
> +	if (list->next == &rq->queuelist)
>  		raise_softirq_irqoff(BLOCK_SOFTIRQ);
>  
>  	local_irq_restore(flags);
> @@ -136,7 +136,7 @@ void __blk_complete_request(struct request *req)
>  		struct list_head *list;
>  do_local:
>  		list = this_cpu_ptr(&blk_cpu_done);
> -		list_add_tail(&req->csd.list, list);
> +		list_add_tail(&req->queuelist, list);
>  
>  		/*
>  		 * if the list only contains our just added request,
> @@ -144,7 +144,7 @@ do_local:
>  		 * entries there, someone already raised the irq but it
>  		 * hasn't run yet.
>  		 */
> -		if (list->next == &req->csd.list)
> +		if (list->next == &req->queuelist)
>  			raise_softirq_irqoff(BLOCK_SOFTIRQ);
>  	} else if (raise_blk_irq(ccpu, req))
>  		goto do_local;
> -- 
> 1.8.1.4
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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