idm_hba_walk_info_t
idm_hba_walk_info_t *hwi;
hwi = (idm_hba_walk_info_t *)mdb_zalloc(
sizeof (idm_hba_walk_info_t), UM_SLEEP|UM_GC);
idm_hba_walk_info_t *hwi = (idm_hba_walk_info_t *)wsp->walk_data;