* Oleg Nesterov <[email protected]> wrote:
> 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().
it's also possible if an arch uses __ARCH_WANT_INTERRUPTS_ON_CTXSW,
right?
[ btw., we dont have a special "scheduling from the idle thread" check
in schedule() anymore, it's now in kernel/sched_idletask.c :-) ]
Ingo
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