On Tue, 2011-06-07 at 22:00 +0530, Trinabh Gupta wrote:
> diff --git a/arch/powerpc/kernel/idle.c b/arch/powerpc/kernel/idle.c
> index 39a2baa..932392b 100644
> --- a/arch/powerpc/kernel/idle.c
> +++ b/arch/powerpc/kernel/idle.c
> @@ -102,6 +102,24 @@ void cpu_idle(void)
> }
> }
>
> +static void do_nothing(void *unused)
> +{
> +}
> +
> +/*
> + * cpu_idle_wait - Used to ensure that all the CPUs come out of the old
> + * idle loop and start using the new idle loop.
> + * Required while changing idle handler on SMP systems.
> + * Caller must have changed idle handler to the new value before the call.
> + */
> +void cpu_idle_wait(void)
> +{
> + smp_mb();
> + /* kick all the CPUs so that they exit out of old idle routine */
> + smp_call_function(do_nothing, NULL, 1);
> +}
> +EXPORT_SYMBOL_GPL(cpu_idle_wait);
> +
> int powersave_nap;
>
> #ifdef CONFIG_SYSCTL
This is gross :-)
Do you need to absolutely ensure the idle task has changed or just
kicking it with a send reschedule is enough ?
Cheers,
Ben.
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