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

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Date:   Tue, 26 May 2020 11:19:38 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        kbuild test robot <lkp@...el.com>
Subject: Re: [PATCH] powerpc/wii: Fix declaration made after definition

On Mon, Apr 13, 2020 at 12:07 PM Nathan Chancellor
<natechancellor@...il.com> wrote:
>
> 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 is_machine usage.

s/is_machine/machine_is/

With that fixup, you may add my reviewed by tag.
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

>
> Fixes: 5a7ee3198dfa ("powerpc: wii: platform support")
> Reported-by: kbuild test robot <lkp@...el.com>
> Link: https://github.com/ClangBuiltLinux/linux/issues/989
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
>  arch/powerpc/platforms/embedded6xx/wii.c | 25 ++++++++++++------------

^ I can run Linux on my Wii...think of the possibilities!

>  1 file changed, 12 insertions(+), 13 deletions(-)
>
> diff --git a/arch/powerpc/platforms/embedded6xx/wii.c b/arch/powerpc/platforms/embedded6xx/wii.c
> index 67e48b0a164e..a802ef957d63 100644
> --- a/arch/powerpc/platforms/embedded6xx/wii.c
> +++ b/arch/powerpc/platforms/embedded6xx/wii.c
> @@ -172,19 +172,6 @@ static void wii_shutdown(void)
>         flipper_quiesce();
>  }
>
> -define_machine(wii) {
> -       .name                   = "wii",
> -       .probe                  = wii_probe,
> -       .setup_arch             = wii_setup_arch,
> -       .restart                = wii_restart,
> -       .halt                   = wii_halt,
> -       .init_IRQ               = wii_pic_probe,
> -       .get_irq                = flipper_pic_get_irq,
> -       .calibrate_decr         = generic_calibrate_decr,
> -       .progress               = udbg_progress,
> -       .machine_shutdown       = wii_shutdown,
> -};
> -
>  static const struct of_device_id wii_of_bus[] = {
>         { .compatible = "nintendo,hollywood", },
>         { },
> @@ -200,3 +187,15 @@ static int __init wii_device_probe(void)
>  }
>  device_initcall(wii_device_probe);
>
> +define_machine(wii) {
> +       .name                   = "wii",
> +       .probe                  = wii_probe,
> +       .setup_arch             = wii_setup_arch,
> +       .restart                = wii_restart,
> +       .halt                   = wii_halt,
> +       .init_IRQ               = wii_pic_probe,
> +       .get_irq                = flipper_pic_get_irq,
> +       .calibrate_decr         = generic_calibrate_decr,
> +       .progress               = udbg_progress,
> +       .machine_shutdown       = wii_shutdown,
> +};
>
> base-commit: 8f3d9f354286745c751374f5f1fcafee6b3f3136
> --

-- 
Thanks,
~Nick Desaulniers