Q: a bogus task_running() check in try_to_wake_up() ?

[Oleg Nesterov]

try_to_wake_up:
	
	if (p->se.on_rq)
		goto out_running;

	...

	if (unlikely(task_running(rq, p)))
		goto out_activate;

How it possible that rq->curr has on_rq == 0 ?

AFAICS, this can only happen if this task is rq->idle. But idle threads
should not sleep, we have a special "scheduling from the idle thread!"
check in schedule().

Thanks in advance,

Oleg.

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