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由 Tejun Heo 提交于
The debug controller grabs cgroup_mutex from interface file show functions which can deadlock and triggers lockdep warnings. Fix it by using cgroup_kn_lock_live()/cgroup_kn_unlock() instead. Signed-off-by: NTejun Heo <tj@kernel.org> Cc: Waiman Long <longman@redhat.com>
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