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845a724580
The cgroup struct has a css field called "self". The main difference between this css and the others found in the cgroup::subsys array is that cgroup::self has a NULL subsystem pointer. There are several places where checks are performed to determine whether the css in question is cgroup::self or not. Instead of accessing css->ss directly, introduce a helper function that shows the intent and use where applicable. Signed-off-by: JP Kobryn <inwardvessel@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>