/* Functons for CSS ID. To get ID other than 0, this should be called when !cgroup_is_removed().  */
unsigned short css_id(struct cgroup_subsys_state *css)
/* Functons for CSS ID. To get ID other than 0, this should be called when !cgroup_is_removed().  */
unsigned short css_id(struct cgroup_subsys_state *css)
{
	struct css_id *cssid = rcu_dereference(css->id);
	if (cssid)
		return cssid->id;
	return 0;
}