Re: Q: preemptible kernel and interrupts consistency.

[Oleg Nesterov <oleg@tv-sign.ru>]

Hello.

I am sorry, may be i do not understand something obvious.

Robert Love wrote:
> That was my point, aside from interrupt handlers all the
> need_resched-touching code is in sched.c and both Ingo and I verified
> everything is locked.
> 
> If interrupts are disabled, there are no interrupts handlers.  And if
> you are in an interrupt handler, preemption is already disabled.

Is it legal to call wake_up_process(some_task) from process context,
with irqs disabled, and current->preempt_count == 0 ?

Then current may have need_resched flag set, and task_rq_unlock() falls
into schedule().

Oleg.