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

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Date:   Mon, 18 May 2020 02:32:00 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Michael Ellerman <mpe@...erman.id.au>
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,
        kbuild test robot <lkp@...el.com>
Subject: Re: [PATCH] powerpc/wii: Fix declaration made after definition

On Mon, Apr 13, 2020 at 12:06:45PM -0700, Nathan Chancellor 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.
> 
> 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 ++++++++++++------------
>  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
> -- 
> 2.26.0
> 

Gentle ping for review/acceptance.

Cheers,
Nathan