have_release_callback 201 kernel/cgroup/cgroup.c static u16 have_release_callback __read_mostly; have_release_callback 5672 kernel/cgroup/cgroup.c have_release_callback |= (bool)ss->release << ss->id; have_release_callback 6142 kernel/cgroup/cgroup.c do_each_subsys_mask(ss, ssid, have_release_callback) {