CPUHP_MD_RAID5_PREPARE
cpuhp_state_remove_instance(CPUHP_MD_RAID5_PREPARE, &conf->node);
err = cpuhp_state_add_instance(CPUHP_MD_RAID5_PREPARE, &conf->node);
ret = cpuhp_setup_state_multi(CPUHP_MD_RAID5_PREPARE,
cpuhp_remove_multi_state(CPUHP_MD_RAID5_PREPARE);
cpuhp_remove_multi_state(CPUHP_MD_RAID5_PREPARE);