linux-kernel - Re: [PATCH v5] conversion to blk-mq

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Date:	Wed, 04 Jun 2014 22:01:09 +0200
From:	Matias Bjorling <m@...rling.me>
To:	Keith Busch <keith.busch@...el.com>, Jens Axboe <axboe@...nel.dk>
CC:	willy@...ux.intel.com, sbradshaw@...ron.com,
	linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
	hch@...radead.org
Subject: Re: [PATCH v5] conversion to blk-mq

On 06/04/2014 08:52 PM, Keith Busch wrote:
> On Wed, 4 Jun 2014, Jens Axboe wrote:
>> On 06/04/2014 12:28 PM, Keith Busch wrote:
>> Are you testing against 3.13? You really need the current tree for this,
>> otherwise I'm sure you'll run into issues (as you appear to be :-)
> 
> I'm using Matias' current tree:
> 
> git://github.com/MatiasBjorling/linux-collab nvmeq_wip_6
> 
> Is this the right one to use? Looks like a 3.15rc1+.
> 
> Also ... obviously that's the wrong diff from before. I didn't save my
> file before creating the diff. Should have looked like this:
> 
> diff --git a/block/blk-mq.c b/block/blk-mq.c
> index d10013b..d1b986c 100644
> --- a/block/blk-mq.c
> +++ b/block/blk-mq.c
> @@ -105,7 +105,8 @@ static int blk_mq_queue_enter(struct request_queue *q)
>      __percpu_counter_add(&q->mq_usage_counter, 1, 1000000);
>      smp_wmb();
>      /* we have problems to freeze the queue if it's initializing */
> -    if (!blk_queue_bypass(q) || !blk_queue_init_done(q))
> +    if (!blk_queue_dying(q) && (!blk_queue_bypass(q) ||
> +                    !blk_queue_init_done(q)))
>          return 0;
> 
>      __percpu_counter_add(&q->mq_usage_counter, -1, 1000000);

Thanks!

I've put your patch into the nvmemq_wip_v6 branch and rebased it on top
of Jens' for-linus.
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