linux-kernel - Re: [PATCH] powerpc: sstep: Mark variable `rc` as unused in function 'analyse

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Date:   Tue, 12 Mar 2019 21:56:36 +0100
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Mathieu Malaterre <malat@...ian.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc: sstep: Mark variable `rc` as unused in function
 'analyse_instr'



Le 12/03/2019 à 21:20, Mathieu Malaterre a écrit :
> Add gcc attribute unused for `rc` variable.
> 
> Fix warnings treated as errors with W=1:
> 
>    arch/powerpc/lib/sstep.c:1172:31: error: variable 'rc' set but not used [-Werror=unused-but-set-variable]
> 
> Signed-off-by: Mathieu Malaterre <malat@...ian.org>
> ---
>   arch/powerpc/lib/sstep.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
> index 3d33fb509ef4..32d092f62ae0 100644
> --- a/arch/powerpc/lib/sstep.c
> +++ b/arch/powerpc/lib/sstep.c
> @@ -1169,7 +1169,7 @@ static nokprobe_inline int trap_compare(long v1, long v2)
>   int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
>   		  unsigned int instr)
>   {
> -	unsigned int opcode, ra, rb, rc, rd, spr, u;
> +	unsigned int opcode, ra, rb, rc __maybe_unused, rd, spr, u;

I think it would be better to enclose 'rc' inside a #ifdef CONFIG_PPC64

Christophe

>   	unsigned long int imm;
>   	unsigned long int val, val2;
>   	unsigned int mb, me, sh;
>