linux-kernel - Re: [PATCH 04/19] powerpc/kvm: Mark variable tmp unused

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Date:   Fri, 23 Mar 2018 11:08:00 +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 04/19] powerpc/kvm: Mark variable tmp unused



Le 22/03/2018 à 21:19, Mathieu Malaterre a écrit :
> Add gcc attribute unused to variable tmp. Fix warning treated as error with
> W=1:
> 
>    arch/powerpc/kernel/kvm.c:675:6: error: variable ‘tmp’ set but not used [-Werror=unused-but-set-variable]
> 
> Signed-off-by: Mathieu Malaterre <malat@...ian.org>
> ---
>   arch/powerpc/kernel/kvm.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
> index 9ad37f827a97..cd3c088283f9 100644
> --- a/arch/powerpc/kernel/kvm.c
> +++ b/arch/powerpc/kernel/kvm.c
> @@ -672,7 +672,7 @@ static void kvm_use_magic_page(void)
>   {
>   	u32 *p;
>   	u32 *start, *end;
> -	u32 tmp;
> +	u32 tmp __maybe_unused;
>   	u32 features;
>   
>   	/* Tell the host to map the magic page to -4096 on all CPUs */
> 

This fonction should use  fault_in_pages_readable() instead of 
hardcoding the verification.

Christophe

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