umem_walk_t
umem_walk_t *umw;
wsp->walk_data = umw = mdb_zalloc(sizeof (umem_walk_t), UM_SLEEP);
mdb_free(umw, sizeof (umem_walk_t));
umem_walk_t *umw = wsp->walk_data;
umem_walk_t *umw = wsp->walk_data;
mdb_free(umw, sizeof (umem_walk_t));