Re: [Xen-devel] [PATCH] acpi: don't register acpi_pad driver if running as xen dom0

["Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>]

On Wednesday, October 12, 2016 01:11:45 PM Juergen Gross wrote:
> When running as Xen dom0 a special processor_aggregator driver is
> needed. Don't register the standard driver in this case.
> 
> Without that check an error message:
> 
> "Error: Driver 'processor_aggregator' is already registered,
> aborting..."
> 
> will be displayed.
> 
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> ---
>  drivers/acpi/acpi_pad.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
> index 8ea8211..1c3be12 100644
> --- a/drivers/acpi/acpi_pad.c
> +++ b/drivers/acpi/acpi_pad.c
> @@ -26,6 +26,7 @@
>  #include <linux/slab.h>
>  #include <linux/acpi.h>
>  #include <asm/mwait.h>
> +#include <xen/xen.h>
>  
>  #define ACPI_PROCESSOR_AGGREGATOR_CLASS      "acpi_pad"
>  #define ACPI_PROCESSOR_AGGREGATOR_DEVICE_NAME "Processor Aggregator"
> @@ -477,6 +478,10 @@ static struct acpi_driver acpi_pad_driver = {
>  
>  static int __init acpi_pad_init(void)
>  {
> +     /* Xen acpi pad is responsible when running as Xen Dom0. */
> +     if (xen_initial_domain())
> +             return -ENODEV;
> +
>       power_saving_mwait_init();
>       if (power_saving_mwait_eax == 0)
>               return -EINVAL;
> 

Applied.

Thanks,
Rafael


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