linux-kernel - Re: [PATCH] [SUBMITTED 20180724] arm64: fix ACPI dependencies

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Date:   Tue, 24 Jul 2018 11:54:25 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Will Deacon <will.deacon@....com>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-ia64@...r.kernel.org,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH] [SUBMITTED 20180724] arm64: fix ACPI dependencies

On Tue, Jul 24, 2018 at 11:48 AM, Arnd Bergmann <arnd@...db.de> 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.
>
> For consistency, all three architectures that support ACPI now
> select ARCH_SUPPORTS_ACPI in exactly the configuration in which
> they allow it. We still need the 'default x86', as each one
> wants a different default: default-y on x86, default-n on arm64,
> and always-y on ia64.
>
> Fixes: 5bcd44083a08 ("drivers: acpi: add dependency of EFI for arm64")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> v2: use 'select ARCH_SUPPORTS_ACPI' for all three.

LGTM

Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

> ---
>  arch/arm64/Kconfig   | 1 +
>  arch/ia64/Kconfig    | 1 +
>  arch/x86/Kconfig     | 1 +
>  drivers/acpi/Kconfig | 8 +++++---
>  4 files changed, 8 insertions(+), 3 deletions(-)
>
> 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/arch/ia64/Kconfig b/arch/ia64/Kconfig
> index ff861420b8f5..02eb68d5d1c0 100644
> --- a/arch/ia64/Kconfig
> +++ b/arch/ia64/Kconfig
> @@ -16,6 +16,7 @@ config IA64
>         select ARCH_MIGHT_HAVE_PC_SERIO
>         select PCI if (!IA64_HP_SIM)
>         select ACPI if (!IA64_HP_SIM)
> +       select ARCH_SUPPORTS_ACPI if (!IA64_HP_SIM)
>         select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
>         select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
>         select HAVE_UNSTABLE_SCHED_CLOCK
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 088b719bc5d1..442575220708 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -76,6 +76,7 @@ config X86
>         select ARCH_MIGHT_HAVE_ACPI_PDC         if ACPI
>         select ARCH_MIGHT_HAVE_PC_PARPORT
>         select ARCH_MIGHT_HAVE_PC_SERIO
> +       select ARCH_SUPPORTS_ACPI
>         select ARCH_SUPPORTS_ATOMIC_RMW
>         select ARCH_SUPPORTS_NUMA_BALANCING     if X86_64
>         select ARCH_USE_BUILTIN_BSWAP
> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> index a8da730fabc6..1edca05ee0ae 100644
> --- a/drivers/acpi/Kconfig
> +++ b/drivers/acpi/Kconfig
> @@ -5,11 +5,10 @@
>
>  menuconfig ACPI
>         bool "ACPI (Advanced Configuration and Power Interface) Support"
> -       depends on !IA64_HP_SIM
> -       depends on IA64 || X86 || (ARM64 && EFI)
> +       depends on ARCH_SUPPORTS_ACPI
>         depends on PCI
>         select PNP
> -       default y if (IA64 || X86)
> +       default y if X86
>         help
>           Advanced Configuration and Power Interface (ACPI) support for
>           Linux requires an ACPI-compliant platform (hardware/firmware),
> @@ -41,6 +40,9 @@ menuconfig ACPI
>           <http://www.acpi.info>
>           <http://www.uefi.org/acpi/specs>
>
> +config ARCH_SUPPORTS_ACPI
> +       bool
> +
>  if ACPI
>
>  config ACPI_LEGACY_TABLES_LOOKUP
> --
> 2.18.0
>
> --
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