umem_hash_walk_t
umem_hash_walk_t *umhw;
umhw = mdb_zalloc(sizeof (umem_hash_walk_t), UM_SLEEP);
mdb_free(umhw, sizeof (umem_hash_walk_t));
umem_hash_walk_t *umhw = wsp->walk_data;
umem_hash_walk_t *umhw = wsp->walk_data;
mdb_free(umhw, sizeof (umem_hash_walk_t));