Optimization in pick_next_task

[Rasmus Villemoes]

In kernel/sched/core.c, we have

        /*
         * Optimization: we know that if all tasks are in the fair class
we can
         * call that function directly,

But then the code goes on to do

                p = fair_sched_class.pick_next_task(rq, prev, rf);
                ...
                if (unlikely(!p))
                        p = idle_sched_class.pick_next_task(rq, prev, rf);

which still loads a function pointer and calls
pick_next_task_{fair,idle} through that. Should those be made extern and
used here, or am I misinterpreting what "directly" refers to?

Rasmus