Re: [Xen-devel] [Patch v2 3/5] xen, acpi_pad: use acpi_evaluate_ost() to replace open-coded version

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Feb 19, 2014 at 02:02:17PM +0800, Jiang Liu wrote:
> Use public function acpi_evaluate_ost() to replace open-coded
> version of evaluating ACPI _OST method.
> 

Looks OK to me.

> Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
> ---
>  drivers/xen/xen-acpi-pad.c |   26 +++++++-------------------
>  1 file changed, 7 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/xen/xen-acpi-pad.c b/drivers/xen/xen-acpi-pad.c
> index 40c4bc0..f83b754 100644
> --- a/drivers/xen/xen-acpi-pad.c
> +++ b/drivers/xen/xen-acpi-pad.c
> @@ -77,27 +77,14 @@ static int acpi_pad_pur(acpi_handle handle)
>       return num;
>  }
>  
> -/* Notify firmware how many CPUs are idle */
> -static void acpi_pad_ost(acpi_handle handle, int stat,
> -     uint32_t idle_nums)
> -{
> -     union acpi_object params[3] = {
> -             {.type = ACPI_TYPE_INTEGER,},
> -             {.type = ACPI_TYPE_INTEGER,},
> -             {.type = ACPI_TYPE_BUFFER,},
> -     };
> -     struct acpi_object_list arg_list = {3, params};
> -
> -     params[0].integer.value = ACPI_PROCESSOR_AGGREGATOR_NOTIFY;
> -     params[1].integer.value =  stat;
> -     params[2].buffer.length = 4;
> -     params[2].buffer.pointer = (void *)&idle_nums;
> -     acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
> -}
> -
>  static void acpi_pad_handle_notify(acpi_handle handle)
>  {
>       int idle_nums;
> +     struct acpi_buffer param = {
> +             .length = 4,
> +             .pointer = (void *)&idle_nums,
> +     };
> +
>  
>       mutex_lock(&xen_cpu_lock);
>       idle_nums = acpi_pad_pur(handle);
> @@ -109,7 +96,8 @@ static void acpi_pad_handle_notify(acpi_handle handle)
>       idle_nums = xen_acpi_pad_idle_cpus(idle_nums)
>                   ?: xen_acpi_pad_idle_cpus_num();
>       if (idle_nums >= 0)
> -             acpi_pad_ost(handle, 0, idle_nums);
> +             acpi_evaluate_ost(handle, ACPI_PROCESSOR_AGGREGATOR_NOTIFY,
> +                               0, &param);
>       mutex_unlock(&xen_cpu_lock);
>  }
>  
> -- 
> 1.7.10.4
> 

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