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Expose the following through cgroup.h: - cgroup_on_dfl() - cgroup_is_dead() - cgroup_for_each_live_child() - cgroup_for_each_live_descendant_pre() - cgroup_for_each_live_descendant_post() Until now, these didn't need to be exposed because controllers only cared about the css hierarchy. The planned sched_ext hierarchical scheduler support will be based on the default cgroup hierarchy, which is in line with the existing BPF cgroup support, and thus needs these exposed. Signed-off-by: Tejun Heo <tj@kernel.org>