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Subject: Re: [PATCH 04/19] powerpc/kvm: Mark variable tmp unused
To:     Mathieu Malaterre <malat@debian.org>,
        Michael Ellerman <mpe@ellerman.id.au>
Cc:     linux-kernel@vger.kernel.org, kvm-ppc@vger.kernel.org,
        Paul Mackerras <paulus@samba.org>,
        linuxppc-dev@lists.ozlabs.org
References: <20180322202007.23088-1-malat@debian.org>
 <20180322202007.23088-5-malat@debian.org>
From:   christophe leroy <christophe.leroy@c-s.fr>
Message-ID: <db7962e0-88f8-b801-9ccb-1f57b14836d3@c-s.fr>
Date:   Fri, 23 Mar 2018 11:08:00 +0100
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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@debian.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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