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

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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>

...

This commit is contained in:

Tejun Heo 2013-08-13 11:01:54 -04:00

parent 0ae78e0bf1

commit b77d7b6088

2 changed files with 13 additions and 2 deletions

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12

kernel/cgroup.c

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3

kernel/events/core.c

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