Re: [Xen-devel] [PATCH] x86/cpuidle: restrict scope of mwait_ptr in acpi_dead_idle()

[Keir Fraser <keir@xxxxxxx>]

On 06/03/2012 14:58, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:

> ... just to make sure it doesn't get used improperly (resulting from
> the discussion around what became c/s 24968:8964c223836c).
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Acked-by: Keir Fraser <keir@xxxxxxx>

> --- a/xen/arch/x86/acpi/cpu_idle.c
> +++ b/xen/arch/x86/acpi/cpu_idle.c
> @@ -565,7 +565,6 @@ static void acpi_dead_idle(void)
>  {
>      struct acpi_processor_power *power;
>      struct acpi_processor_cx *cx;
> -    void *mwait_ptr;
>  
>      if ( (power = processor_powers[smp_processor_id()]) == NULL )
>          goto default_halt;
> @@ -573,10 +572,10 @@ static void acpi_dead_idle(void)
>      if ( (cx = &power->states[power->count-1]) == NULL )
>          goto default_halt;
>  
> -    mwait_ptr = (void *)&mwait_wakeup(smp_processor_id());
> -
>      if ( cx->entry_method == ACPI_CSTATE_EM_FFH )
>      {
> +        void *mwait_ptr = &mwait_wakeup(smp_processor_id());
> +
>          /*
>           * Cache must be flushed as the last operation before sleeping.
>           * Otherwise, CPU may still hold dirty data, breaking cache
> coherency,
> 
> 
> 
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> http://lists.xen.org/xen-devel



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