dict_walk_data_t
dict_walk_data_t *dwd;
dwd = mdb_alloc(sizeof (dict_walk_data_t), UM_SLEEP);
dict_walk_data_t *dwd = wsp->walk_data;
dict_walk_data_t *wd = wsp->walk_data;
mdb_free(wd, sizeof (dict_walk_data_t));