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

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Date:   Tue, 24 Jul 2018 16:14:37 +0100
From:   Will Deacon <will.deacon@....com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        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 12:23:48PM +0200, Rafael J. Wysocki wrote:
> On Tue, Jul 24, 2018 at 12:21 PM, Will Deacon <will.deacon@....com> wrote:
> > On Tue, Jul 24, 2018 at 11:54:25AM +0200, Rafael J. Wysocki wrote:
> >> 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>
> >
> > Same here:
> >
> > Acked-by: Will Deacon <will.deacon@....com>
> >
> > Would it be ok if I take this via the arm64 tree, since that's where the
> > warning was introduced?
> 
> Yes, it would, from the ACPI side.

Ok, I'll stick this into next tomorrow pending any objections from the x86
maintainers.

Will