rt_waiter_node_less
if (rt_waiter_node_less(&waiter->tree, &top_waiter->tree))
if (rt_waiter_node_less(&aw->tree, &bw->tree))
if (rt_waiter_node_less(&bw->tree, &aw->tree))
return rt_waiter_node_less(__node_2_rt_node(a), __node_2_rt_node(b));