linux-kernel - Re: [PATCH 07/14] blk-mq: Cleanup a loop exit condition

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Date:   Tue, 20 Sep 2016 13:33:03 +0200
From:   Alexander Gordeev <agordeev@...hat.com>
To:     Omar Sandoval <osandov@...ndov.com>
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH 07/14] blk-mq: Cleanup a loop exit condition

On Mon, Sep 19, 2016 at 12:00:28PM -0700, Omar Sandoval wrote:
> On Sun, Sep 18, 2016 at 09:37:17AM +0200, Alexander Gordeev wrote:
> > CC: linux-block@...r.kernel.org
> > Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
> 
> So set->nr_hw_queues is always >= q->nr_hw_queues, right?

That is what I conclude form blk_mq_realloc_hw_ctxs() code:

	for (i = 0; i < set->nr_hw_queues; i++) {
		...
	}
	...
	q->nr_hw_queues = i;

> Reviewed-by: Omar Sandoval <osandov@...com>
> 
> > ---
> >  block/blk-mq.c | 9 +++------
> >  1 file changed, 3 insertions(+), 6 deletions(-)
> > 
> > diff --git a/block/blk-mq.c b/block/blk-mq.c
> > index 9fbfe31..b2ef8f5 100644
> > --- a/block/blk-mq.c
> > +++ b/block/blk-mq.c
> > @@ -1681,16 +1681,13 @@ static void blk_mq_exit_hctx(struct request_queue *q,
> >  }
> >  
> >  static void blk_mq_exit_hw_queues(struct request_queue *q,
> > -		struct blk_mq_tag_set *set, int nr_queue)
> > +		struct blk_mq_tag_set *set)
> >  {
> >  	struct blk_mq_hw_ctx *hctx;
> >  	unsigned int i;
> >  
> > -	queue_for_each_hw_ctx(q, hctx, i) {
> > -		if (i == nr_queue)
> > -			break;
> > +	queue_for_each_hw_ctx(q, hctx, i)
> >  		blk_mq_exit_hctx(q, set, hctx, i);
> > -	}
> >  }
> >  
> >  static void blk_mq_free_hw_queues(struct request_queue *q,
> > @@ -2124,7 +2121,7 @@ void blk_mq_free_queue(struct request_queue *q)
> >  
> >  	blk_mq_del_queue_tag_set(q);
> >  
> > -	blk_mq_exit_hw_queues(q, set, set->nr_hw_queues);
> > +	blk_mq_exit_hw_queues(q, set);
> >  	blk_mq_free_hw_queues(q, set);
> >  }
> >  
> > -- 
> > 1.8.3.1
> > 
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-block" in
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> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
> -- 
> Omar