cgroup_kn_lock_live
struct cgroup *cgroup_kn_lock_live(struct kernfs_node *kn, bool drain_offline);
cgrp = cgroup_kn_lock_live(of->kn, false);
cgrp = cgroup_kn_lock_live(of->kn, false);
cgrp = cgroup_kn_lock_live(of->kn, true);
cgrp = cgroup_kn_lock_live(of->kn, true);
cgrp = cgroup_kn_lock_live(of->kn, false);
cgrp = cgroup_kn_lock_live(of->kn, false);
cgrp = cgroup_kn_lock_live(of->kn, false);
cgrp = cgroup_kn_lock_live(of->kn, false);
cgrp = cgroup_kn_lock_live(of->kn, false);
cgrp = cgroup_kn_lock_live(of->kn, false);
dst_cgrp = cgroup_kn_lock_live(of->kn, false);
parent = cgroup_kn_lock_live(parent_kn, false);
cgrp = cgroup_kn_lock_live(kn, false);
cgrp = cgroup_kn_lock_live(of->kn, false);
cgrp = cgroup_kn_lock_live(of->kn, false);
if (!cgroup_kn_lock_live(of->kn, false))