__rb_hierarchy_next
nd = __rb_hierarchy_next(nd, HMD_FORCE_CHILD);
nd = __rb_hierarchy_next(nd, HMD_FORCE_CHILD);
nd = __rb_hierarchy_next(nd, HMD_FORCE_CHILD)) {
nd = __rb_hierarchy_next(&h->rb_node, HMD_FORCE_CHILD);
nd = __rb_hierarchy_next(&h->rb_node, HMD_FORCE_SIBLING);
nd = __rb_hierarchy_next(&h->rb_node, HMD_FORCE_SIBLING);
struct rb_node *__rb_hierarchy_next(struct rb_node *node,
return __rb_hierarchy_next(node, HMD_NORMAL);