linux-kernel - Re: linux-next: build warning after merge of the arm64 tree

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Date:   Tue, 24 Jul 2018 09:26:31 +0900
From:   AKASHI Takahiro <takahiro.akashi@...aro.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: linux-next: build warning after merge of the arm64 tree

On Tue, Jul 24, 2018 at 09:05:45AM +1000, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the arm64 tree, today's linux-next build (x86_64
> allmodconfig) produced this warning:

Where can I find this specific branch?

> drivers/acpi/Kconfig:6:error: recursive dependency detected!
> drivers/acpi/Kconfig:6:	symbol ACPI depends on EFI

My patch created an additional dependency like:
  menu ACPI
    ...
    depends on IA64 || X86 || (ARM64 && EFI)

> arch/x86/Kconfig:1920:	symbol EFI depends on ACPI

So I don't understand why this change makes a warning on x86_64 build.
Is this a real recursive dependency?

Thanks,
-Takahiro AKASHI

> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> 
> Introduced by commit
> 
>   5bcd44083a08 ("drivers: acpi: add dependency of EFI for arm64")
> 
> -- 
> Cheers,
> Stephen Rothwell