Re: [patch] improve SMP reschedule and idle routines

[Oleg Nesterov]

Nick Piggin wrote:
>
>  void default_idle(void)
>  {
> +	local_irq_enable();
> +

Stupid question. Why is this sti() needed?

Interrupts are enabled in start_secondary() before cpu_idle()
call, and they can't be disabled after return from schedule().

The same question applies to poll_idle/mwait_idle.

Oleg.
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