On Mon, Mar 22, 2021 at 05:02:44PM +0100, Arnd Bergmann <arnd@xxxxxxxxxx> wrote: > I'm not sure what is expected to happen for such a configuration, > presumably these functions are never calls in that case. Yes, the functions you patched would only be called from subsystems or there should be no way to obtain a struct cgroup_subsys reference anyway (hence it's ok to always branch as if ss==NULL). I'd prefer a variant that wouldn't compile the affected codepaths when there are no subsystems registered, however, I couldn't come up with a way how to do it without some preprocessor ugliness. Reviewed-by: Michal Koutný <mkoutny@xxxxxxxx>
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