linux-kernel - Re: [PATCH 02/19] powerpc/powermac: Mark variable x as unused

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Date:   Fri, 23 Mar 2018 10:38:59 +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 02/19] 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/udbg_scc.c:76:9: error: variable ‘x’ set but not used [-Werror=unused-but-set-variable]
> 
> Signed-off-by: Mathieu Malaterre <malat@...ian.org>
> ---
>   arch/powerpc/platforms/powermac/udbg_scc.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/platforms/powermac/udbg_scc.c b/arch/powerpc/platforms/powermac/udbg_scc.c
> index d83135a9830e..c38ca406df1a 100644
> --- a/arch/powerpc/platforms/powermac/udbg_scc.c
> +++ b/arch/powerpc/platforms/powermac/udbg_scc.c
> @@ -73,7 +73,7 @@ void udbg_scc_init(int force_scc)
>   	struct device_node *stdout = NULL, *escc = NULL, *macio = NULL;
>   	struct device_node *ch, *ch_def = NULL, *ch_a = NULL;
>   	const char *path;
> -	int i, x;
> +	int i, x __maybe_unused;

You could just replace 'x = in_8(sccc)' by 'in_8(sccc)' and get rid of 
the x.

Christophe


>   
>   	escc = of_find_node_by_name(NULL, "escc");
>   	if (escc == NULL)
> 

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