linux-kernel - Re: [PATCH v2] cls_cgroup: Fix rcu lockdep warning

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Date:	Fri, 03 Sep 2010 09:55:39 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	lizf@...fujitsu.com
Cc:	herbert@...dor.hengli.com.au, davej@...hat.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	peterz@...radead.org, menage@...gle.com
Subject: Re: [PATCH v2] cls_cgroup: Fix rcu lockdep warning

From: Li Zefan <lizf@...fujitsu.com>
Date: Fri, 03 Sep 2010 09:42:43 +0800

> Dave reported an rcu lockdep warning on 2.6.35.4 kernel
> 
> task->cgroups and task->cgroups->subsys[i] are protected by RCU.
> So we avoid accessing invalid pointers here. This might happen,
> for example, when you are deref-ing those pointers while someone
> move @task from one cgroup to another.
> 
> Reported-by: Dave Jones <davej@...hat.com>
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>

Applied, thanks.
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