_cgrp_subsys_enabled_key 80 include/linux/cgroup.h extern struct static_key_true _x ## _cgrp_subsys_enabled_key; \ _cgrp_subsys_enabled_key 135 kernel/cgroup/cgroup.c DEFINE_STATIC_KEY_TRUE(_x ## _cgrp_subsys_enabled_key); \ _cgrp_subsys_enabled_key 137 kernel/cgroup/cgroup.c EXPORT_SYMBOL_GPL(_x ## _cgrp_subsys_enabled_key); \ _cgrp_subsys_enabled_key 142 kernel/cgroup/cgroup.c #define SUBSYS(_x) [_x ## _cgrp_id] = &_x ## _cgrp_subsys_enabled_key,