topo_node_hash
index = topo_node_hash(node->tn_phash, node->tn_instance) + 1;
h = topo_node_hash(nhp, inst);
h = topo_node_hash(nhp, inst);
h = topo_node_hash(nhp, inst);
extern int topo_node_hash(topo_nodehash_t *, topo_instance_t);