cgroup: remove cgroup_mutex from cgroupstats_build

The function cgroupstats_build extracts cgroup from the kernfs_node's
priv pointer which is a RCU pointer. So, there is no need to grab
cgroup_mutex. Just get the reference on the cgroup before using and
remove the cgroup_mutex altogether.

Signed-off-by: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Shakeel Butt 2021-10-24 23:19:15 -07:00 • committed by Tejun Heo
commit bb75842141