linux-kernel - Re: lockdep warning on block tree for-2.6.35 branch

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Message-ID: <4BC7E017.4020002@cn.fujitsu.com>
Date:	Fri, 16 Apr 2010 11:57:11 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Divyesh Shah <dpshah@...gle.com>
CC:	Gui Jianfeng <guijianfeng@...fujitsu.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: lockdep warning on block tree for-2.6.35 branch

Divyesh Shah :
> Hi Gui,
>     Thanks for the report. I can reproduce this and have a patch that
> fixes it and makes the warning go away. My understanding of what was
> happening is that the stats_lock for the root cfqg was not getting
> initialized and hence was missing the static lock_class_key
> declaration. This is because we call blkio_group_init() only when
> dynamically allocating new cfqg which does not cover the root cfqg.
> I'll send out the patch next.
> 

We just found out the cause and was about to make a fix. :)

-- Li
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