linux-kernel - Re: [PATCH v2] powerpc/wii: Fix declaration made after definition

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Date:   Thu, 28 May 2020 23:32:29 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Nathan Chancellor <natechancellor@...il.com>,
        kbuild test robot <lkp@...el.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v2] powerpc/wii: Fix declaration made after definition

Nathan Chancellor <natechancellor@...il.com> writes:
> A 0day randconfig uncovered an error with clang, trimmed for brevity:
>
> arch/powerpc/platforms/embedded6xx/wii.c:195:7: error: attribute
> declaration must precede definition [-Werror,-Wignored-attributes]
>         if (!machine_is(wii))
>              ^
>
> The macro machine_is declares mach_##name but define_machine actually
> defines mach_##name, hence the warning.
>
> To fix this, move define_machine after the machine_is usage.
>
> Fixes: 5a7ee3198dfa ("powerpc: wii: platform support")
> Reported-by: kbuild test robot <lkp@...el.com>
> Link: https://github.com/ClangBuiltLinux/linux/issues/989
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
>
> v1 -> v2:
>
> * s/is_machine/machine_is/ (Nick)
>
> * Add Nick's reviewed-by tag.

I already picked up v1, and it's behind a merge so I don't want to
rebase it. I'll live with the typo. Thanks.

cheers