static int mem_cgroup_can_attach(struct cgroup_subsys *ss,
				struct cgroup *cgroup,
				struct cgroup_taskset *tset)
{
	return 0;
}
static int mem_cgroup_can_attach(struct cgroup_subsys *ss,
				struct cgroup *cgroup,
				struct cgroup_taskset *tset)
{
	return 0;
}