From: Li Zefan <lizf@cn.fujitsu.com>
Date: Thu, 2 Sep 2010 15:42:43 +0000 (+0000)
Subject: cls_cgroup: Fix rcu lockdep warning
X-Git-Tag: v2.6.36-rc4~6^2~23
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3fb5a991916091a908d53608a5899240039fb51e;p=pandora-kernel.git

cls_cgroup: Fix rcu lockdep warning

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@redhat.com>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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