CPUHP_ZCOMP_PREPARE
ret = cpuhp_state_add_instance(CPUHP_ZCOMP_PREPARE, &comp->node);
cpuhp_state_remove_instance(CPUHP_ZCOMP_PREPARE, &comp->node);
cpuhp_remove_multi_state(CPUHP_ZCOMP_PREPARE);
ret = cpuhp_setup_state_multi(CPUHP_ZCOMP_PREPARE, "block/zram:prepare",
cpuhp_remove_multi_state(CPUHP_ZCOMP_PREPARE);
cpuhp_remove_multi_state(CPUHP_ZCOMP_PREPARE);