linux-kernel - Re: [PATCH 03/19] powerpc: Mark variables as unused

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Date:   Fri, 23 Mar 2018 11:03:50 +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 03/19] powerpc: Mark variables as unused



Le 22/03/2018 à 21:19, Mathieu Malaterre a écrit :
> Add gcc attribute unused for two variables. Fix warnings treated as errors
> with W=1:
> 
>    arch/powerpc/kernel/prom_init.c:1388:8: error: variable ‘path’ set but not used [-Werror=unused-but-set-variable]
> 
> Signed-off-by: Mathieu Malaterre <malat@...ian.org>
> ---
>   arch/powerpc/kernel/prom_init.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
> index acf4b2e0530c..6a3ac4522144 100644
> --- a/arch/powerpc/kernel/prom_init.c
> +++ b/arch/powerpc/kernel/prom_init.c
> @@ -603,7 +603,7 @@ static void __init early_cmdline_parse(void)
>   	const char *opt;
>   
>   	char *p;
> -	int l = 0;
> +	int l __maybe_unused = 0;
>   
>   	prom_cmd_line[0] = 0;
>   	p = prom_cmd_line;
> @@ -1385,7 +1385,7 @@ static void __init reserve_mem(u64 base, u64 size)
>   static void __init prom_init_mem(void)
>   {
>   	phandle node;
> -	char *path, type[64];
> +	char *path __maybe_unused, type[64];

path is only used if DEBUG_PROM is defined, so it should be enclosed 
into #ifdef DEBUG_PROM

Christophe

>   	unsigned int plen;
>   	cell_t *p, *endp;
>   	__be32 val;
> 

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