insubtree_dependents_down
if (insubtree_dependents_down(vertex) == B_TRUE) {
if (insubtree_dependents_down(v) == B_TRUE) {
static boolean_t insubtree_dependents_down(graph_vertex_t *);
if (insubtree_dependents_down(vv) == B_FALSE)
if (insubtree_dependents_down(v) == B_TRUE) {