Re: [PATCH v2 1/6] idle: move the cpuidle entry point to the generic idle loop

Peter Zijlstra
2014-01-30T18:07:34Z

On Thu, Jan 30, 2014 at 06:28:52PM +0100, Daniel Lezcano wrote:
> Ok, I think the mess is coming from 'default_idle' which does not re-enable
> the local_irq but used from different places like amd_e400_idle and
> apm_cpu_idle.
>
> void default_idle(void)
> {
> trace_cpu_idle_rcuidle(1, smp_processor_id());
> safe_halt();
> trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
> }
>
> Considering the system configured without cpuidle because this one *always*
> enable the local irq, we have the different cases:
>
> x86_idle = default_idle();
> ==> local_irq_enable is missing
>

safe_halt() is "sti; hlt" and so very much does the irq_enable.