linux-kernel - Re: [PATCH v2 01/19] powerpc/powermac: Mark variable x as unused

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Date:   Thu, 29 Mar 2018 18:07:43 +0200
From:   LEROY Christophe <christophe.leroy@....fr>
To:     Mathieu Malaterre <malat@...ian.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Paul Mackerras <paulus@...ba.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH v2 01/19] powerpc/powermac: Mark variable x as unused

Mathieu Malaterre <malat@...ian.org> 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>
> ---
> v2: move x variable within its local scope
>
>  arch/powerpc/platforms/powermac/bootx_init.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/platforms/powermac/bootx_init.c  
> b/arch/powerpc/platforms/powermac/bootx_init.c
> index c3c9bbb3573a..d44e8571c1ec 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;
>  	char *model;
>  	unsigned long offset = reloc_offset();
>
> @@ -562,6 +562,7 @@ void __init bootx_init(unsigned long r3,  
> unsigned long r4)
>  	 * MMU switched OFF, so this should not be useful anymore.
>  	 */
>  	if (bi->version < 4) {
> +		unsigned long x __maybe_unused;
>  		bootx_printf("Touching pages...\n");

Stylewise, there should be an empty line after your declaration.

But I believe you should remove that ugly loop and replace it by a  
call to fault_in_pages_readable()

Christophe
>
>  		/*
> --
> 2.11.0