Re: [PATCH] arm64: fix ACPI dependencies

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On Tue, Jul 24, 2018 at 11:33 AM, Arnd Bergmann <arnd@xxxxxxxx> wrote:
> Kconfig reports a warning on x86 builds after the ARM64 dependency
> was added.
>
> drivers/acpi/Kconfig:6:error: recursive dependency detected!
> drivers/acpi/Kconfig:6:       symbol ACPI depends on EFI
>
> This rephrases the dependency to keep the ARM64 details out of the
> shared Kconfig file, so Kconfig no longer gets confused by it.
>
> Fixes: 5bcd44083a08 ("drivers: acpi: add dependency of EFI for arm64")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
>  arch/arm64/Kconfig   | 1 +
>  drivers/acpi/Kconfig | 5 ++++-
>  2 files changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index cdcaa6a798b2..2f987a938405 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -1267,6 +1267,7 @@ config EFI
>         bool "UEFI runtime support"
>         depends on OF && !CPU_BIG_ENDIAN
>         depends on KERNEL_MODE_NEON
> +       select ARCH_SUPPORTS_ACPI
>         select LIBFDT
>         select UCS2_STRING
>         select EFI_PARAMS_FROM_FDT
> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> index a8da730fabc6..0cda51c5d433 100644
> --- a/drivers/acpi/Kconfig
> +++ b/drivers/acpi/Kconfig
> @@ -6,7 +6,7 @@
>  menuconfig ACPI
>         bool "ACPI (Advanced Configuration and Power Interface) Support"
>         depends on !IA64_HP_SIM
> -       depends on IA64 || X86 || (ARM64 && EFI)
> +       depends on IA64 || X86 || ARCH_SUPPORTS_ACPI

That doesn't look particularly consistent to me.

It should be either "depends on ARCH_SUPPORTS_ACPI" alone or mention
ARM64 somehow IMO

>         depends on PCI
>         select PNP
>         default y if (IA64 || X86)
> @@ -41,6 +41,9 @@ menuconfig ACPI
>           <http://www.acpi.info>
>           <http://www.uefi.org/acpi/specs>
>
> +config ARCH_SUPPORTS_ACPI
> +       bool
> +
>  if ACPI
>
>  config ACPI_LEGACY_TABLES_LOOKUP
> --
--
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