Re: [Xen-devel] [PATCH v6 2/3] ACPI: add config for BIOS table scan

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Sat, 30 Jan 2016, Shannon Zhao wrote:
> From: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
> 
> With the addition of ARM64 that does not have a traditional BIOS to
> scan, add a config option which is selected on x86 (ia64 doesn't need
> it either, it is EFI/UEFI based system) to do the traditional BIOS
> scanning for tables.
> 
> Signed-off-by: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
> Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> [Linux commit 8a1664be0b922dd6afd60eca96a992ef5ec22c40]
> [Include <xen/kconfig.h> in osl.c so that it could use IS_ENABLED]
> Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>


>  xen/arch/x86/Kconfig     | 1 +
>  xen/drivers/acpi/Kconfig | 3 +++
>  xen/drivers/acpi/osl.c   | 5 ++++-
>  3 files changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/xen/arch/x86/Kconfig b/xen/arch/x86/Kconfig
> index 7d2ed96..9fdd3b1 100644
> --- a/xen/arch/x86/Kconfig
> +++ b/xen/arch/x86/Kconfig
> @@ -3,6 +3,7 @@ config X86_64
>  
>  config X86
>       def_bool y
> +     select ACPI_LEGACY_TABLES_LOOKUP
>       select COMPAT
>       select HAS_ACPI
>       select HAS_CPUFREQ
> diff --git a/xen/drivers/acpi/Kconfig b/xen/drivers/acpi/Kconfig
> index 11ab5e4..82d73ca 100644
> --- a/xen/drivers/acpi/Kconfig
> +++ b/xen/drivers/acpi/Kconfig
> @@ -2,3 +2,6 @@
>  # Select HAS_ACPI if ACPI is supported
>  config HAS_ACPI
>       bool
> +
> +config ACPI_LEGACY_TABLES_LOOKUP
> +     bool
> diff --git a/xen/drivers/acpi/osl.c b/xen/drivers/acpi/osl.c
> index ce15470..2f1d723 100644
> --- a/xen/drivers/acpi/osl.c
> +++ b/xen/drivers/acpi/osl.c
> @@ -38,6 +38,7 @@
>  #include <xen/domain_page.h>
>  #include <xen/efi.h>
>  #include <xen/vmap.h>
> +#include <xen/kconfig.h>
>  
>  #define _COMPONENT           ACPI_OS_SERVICES
>  ACPI_MODULE_NAME("osl")
> @@ -75,12 +76,14 @@ acpi_physical_address __init 
> acpi_os_get_root_pointer(void)
>                              "System description tables not found\n");
>                       return 0;
>               }
> -     } else {
> +     } else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
>               acpi_physical_address pa = 0;
>  
>               acpi_find_root_pointer(&pa);
>               return pa;
>       }
> +
> +     return 0;
>  }
>  
>  void __iomem *
> -- 
> 2.0.4
> 
> 
> 
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> 

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