class_walk_data_t
class_walk_data_t *cl_walker;
cl_walker = mdb_zalloc(sizeof (class_walk_data_t), UM_SLEEP);
class_walk_data_t *cl_walker;
cl_walker = (class_walk_data_t *)wsp->walk_data;
class_walk_data_t *cl_walker = wsp->walk_data;