drain_offline     213 kernel/cgroup/cgroup-internal.h struct cgroup *cgroup_kn_lock_live(struct kernfs_node *kn, bool drain_offline);
drain_offline    1595 kernel/cgroup/cgroup.c struct cgroup *cgroup_kn_lock_live(struct kernfs_node *kn, bool drain_offline)
drain_offline    1614 kernel/cgroup/cgroup.c 	if (drain_offline)