cgroup_control
cgroup_print_ss_mask(seq, cgroup_control(cgrp));
dsct->subtree_control &= cgroup_control(dsct);
if (cgroup_control(cgrp) & (1 << ss->id))
if (!(cgroup_control(cgrp) & (1 << ssid))) {
cgrp->subtree_control = cgroup_control(cgrp);