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Subject: Re: [PATCH] powerpc: sstep: Mark variable `rc` as unused in function
 'analyse_instr'
To:     Mathieu Malaterre <malat@debian.org>,
        Michael Ellerman <mpe@ellerman.id.au>
Cc:     Paul Mackerras <paulus@samba.org>, linuxppc-dev@lists.ozlabs.org,
        linux-kernel@vger.kernel.org
References: <20190312202008.29681-1-malat@debian.org>
From:   Christophe Leroy <christophe.leroy@c-s.fr>
Message-ID: <57a0d93c-8784-d6af-a5fb-75e31455ae57@c-s.fr>
Date:   Tue, 12 Mar 2019 21:56:36 +0100
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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@debian.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;
>