linux-kernel - Re: [PATCH v1 5/9] block: loop: convert to blk-mq

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Message-ID: <53EE370D.1060106@kernel.dk>
Date:	Fri, 15 Aug 2014 10:36:29 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Christoph Hellwig <hch@...radead.org>,
	Ming Lei <ming.lei@...onical.com>
CC:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Kleikamp <dave.kleikamp@...cle.com>,
	Zach Brown <zab@...bo.net>, Benjamin LaHaise <bcrl@...ck.org>,
	Kent Overstreet <kmo@...erainc.com>, linux-aio@...ck.org,
	linux-fsdevel@...r.kernel.org, Dave Chinner <david@...morbit.com>
Subject: Re: [PATCH v1 5/9] block: loop: convert to blk-mq

On 08/15/2014 10:31 AM, Christoph Hellwig wrote:
>> +static void loop_queue_work(struct work_struct *work)
> 
> Offloading work straight to a workqueue dosn't make much sense
> in the blk-mq model as we'll usually be called from one.  If you
> need to avoid the cases where we are called directly a flag for
> the blk-mq code to always schedule a workqueue sounds like a much
> better plan.

That's a good point - would clean up this bit, and be pretty close to a
one-liner to support in blk-mq for the drivers that always need blocking
context.

-- 
Jens Axboe

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