From: Tejun Heo <tj@kernel.org>
Date: Tue, 13 Aug 2013 15:01:54 +0000 (-0400)
Subject: cgroup: cgroup_css_from_dir() now should be called with RCU read locked
X-Git-Tag: v3.12-rc1~173^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b77d7b6088377998ebf65eaea5e51008c2d75e94;p=pandora-kernel.git

cgroup: cgroup_css_from_dir() now should be called with RCU read locked

cgroup->subsys[] will become RCU protected and thus all cgroup_css()
usages should either be under RCU read lock or cgroup_mutex.  This
patch updates cgroup_css_from_dir() which returns the matching
cgroup_subsys_state given a directory file and subsys_id so that it
requires RCU read lock and updates its sole user
perf_cgroup_connect().

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
---

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