domain_walk_t
dwp = mdb_alloc(sizeof (domain_walk_t), UM_SLEEP);
domain_walk_t *dwp = (domain_walk_t *)wsp->walk_data;
domain_walk_t *dwp = (domain_walk_t *)wsp->walk_data;
mdb_free(dwp, sizeof (domain_walk_t));
domain_walk_t *dwp;