On Tue, Nov 29, 2011 at 01:04:14PM -0500, Konrad Rzeszutek Wilk wrote:
> This patch:
>
> commit d91ee5863b71e8c90eaf6035bff3078a85e2e7b5
> Author: Len Brown <len.brown@xxxxxxxxx>
> Date: Fri Apr 1 18:28:35 2011 -0400
>
> cpuidle: replace xen access to x86 pm_idle and default_idle
>
> ..scribble on pm_idle and access default_idle,
> have it simply disable_cpuidle() so acpi_idle will not load and
> architecture default HLT will be used.
>
> idea was to have one call - disable_cpuidle() which would make
> pm_idle not be molested by other code. It disallows cpuidle_idle_call
> and acpi_idle_call to not set pm_idle (which is excellent). But the
what is acpi_idle_call, I can't find it anywhere.
> amd_e400_idle and mwait_idle can still setup pm_idle which we really
> do not want.
This is not the case: rather select_idle_routine()/idle_setup() sets
pm_idle.
[..]
> +bool set_pm_idle_to_default()
> +{
> + if (!pm_idle) {
> + pm_idle = default_idle;
> + return true;
> + }
> + return false;
> +}
I don't understand what you're trying to achieve here? Do you want
default_idle to be always the pm_idle for xen or what is the deal here?
If yes, then simply do:
bool set_pm_idle_to_default(void) // remember to add "void" for no function args
{
bool ret = !!pm_idle;
pm_idle = default_idle;
return ret;
}
...
> void stop_this_cpu(void *dummy)
> {
> local_irq_disable();
> diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
> index 46d6d21..7506181 100644
> --- a/arch/x86/xen/setup.c
> +++ b/arch/x86/xen/setup.c
> @@ -448,6 +448,6 @@ void __init xen_arch_setup(void)
> #endif
> disable_cpuidle();
> boot_option_idle_override = IDLE_HALT;
> -
> + WARN_ON(!set_pm_idle_to_default());
and then do
WARN_ON(set_pm_idle_to_default());
instead of having arbitrary confusing logic. This way you can warn
whether something else set pm_idle already. Or?
Thanks.
--
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Boris.
Advanced Micro Devices GmbH
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