linux-kernel - Re: [PATCH 01/19] powerpc/powermac: Mark variable x as unused

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Date:   Fri, 23 Mar 2018 10:18:21 +0100
From:   christophe leroy <christophe.leroy@....fr>
To:     Mathieu Malaterre <malat@...ian.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, kvm-ppc@...r.kernel.org,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 01/19] powerpc/powermac: Mark variable x as unused



Le 22/03/2018 à 21:19, Mathieu Malaterre a écrit :
> Since the value of x is never intended to be read, declare it with gcc
> attribute as unused. Fix warning treated as error with W=1:
> 
>    arch/powerpc/platforms/powermac/bootx_init.c:471:21: error: variable ‘x’ set but not used [-Werror=unused-but-set-variable]
> 
> Signed-off-by: Mathieu Malaterre <malat@...ian.org>
> ---
>   arch/powerpc/platforms/powermac/bootx_init.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/platforms/powermac/bootx_init.c b/arch/powerpc/platforms/powermac/bootx_init.c
> index c3c9bbb3573a..d3ce55dae78f 100644
> --- a/arch/powerpc/platforms/powermac/bootx_init.c
> +++ b/arch/powerpc/platforms/powermac/bootx_init.c
> @@ -468,7 +468,7 @@ void __init bootx_init(unsigned long r3, unsigned long r4)
>   	boot_infos_t *bi = (boot_infos_t *) r4;
>   	unsigned long hdr;
>   	unsigned long space;
> -	unsigned long ptr, x;
> +	unsigned long ptr, x __maybe_unused;

Why not use fault_in_pages_readable() instead of the hardcoded part that 
uses x ?

If you decide to keep it as is, at least x should be declared inside the 
if (bi->version < 4)

Christophe


>   	char *model;
>   	unsigned long offset = reloc_offset();
>   
> 

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