linux-kernel - Re: [PATCHSET] blkcg: accumulated blkcg updates

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Message-ID: <20120308000633.GH30676@google.com>
Date:	Wed, 7 Mar 2012 16:06:33 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	axboe@...nel.dk, ctalbott@...gle.com, rni@...gle.com,
	linux-kernel@...r.kernel.org, dm-devel@...hat.com
Subject: Re: [PATCHSET] blkcg: accumulated blkcg updates

Hello,

On Tue, Mar 06, 2012 at 02:02:11PM -0500, Vivek Goyal wrote:
> Ok, found it. Basically we have not initialized the q->queue_head during
> queue creation. Hence we end up thinking that q->queue_head is not empty.
> 
> So following fixed the issue for me. I still don't understand the special
> cased code (q->queue_head is not empty but don't kick queue).

It was mainly to avoid adding a new requirement as we didn't use to
require queue_head to be empty on exit.  I didn't realize we weren't
initializing queue_head from alloc.  Jens folded your fix into the
original patch, so we might not need the special case anymore.

I'll post fix for the RCU deref warning shortly.

Thanks.

-- 
tejun
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