cgroup_attach_unlock
void cgroup_attach_unlock(enum cgroup_attach_lock_mode lock_mode,
cgroup_attach_unlock(CGRP_ATTACH_LOCK_GLOBAL, NULL);
cgroup_attach_unlock(CGRP_ATTACH_LOCK_GLOBAL, NULL);
cgroup_attach_unlock(*lock_mode, tsk);
cgroup_attach_unlock(lock_mode, task);
cgroup_attach_unlock(lock_mode, NULL);