static bool cgroup_is_mixable(struct cgroup *cgrp)
{
	/*
	 * Root isn't under domain level resource control exempting it from
	 * the no-internal-process constraint, so it can serve as a thread
	 * root and a parent of resource domains at the same time.
	 */
	return !cgroup_parent(cgrp);
}
static bool cgroup_is_mixable(struct cgroup *cgrp)
{
	 
	return !cgroup_parent(cgrp);
}