linux-kernel - Re: [PATCH] KVM: MIPS: fix -Wunused-but-set-variable warning

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Message-ID: <ZSlrkKHT_U64raV4@google.com>
Date:   Fri, 13 Oct 2023 09:08:48 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Huacai Chen <chenhuacai@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "Philippe Mathieu-Daudé" <philmd@...aro.org>
Subject: Re: [PATCH] KVM: MIPS: fix -Wunused-but-set-variable warning

On Thu, Oct 12, 2023, Paolo Bonzini wrote:
> The variable is completely unused, remove it.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
>  arch/mips/kvm/mmu.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c
> index 7b2ac1319d70..467ee6b95ae1 100644
> --- a/arch/mips/kvm/mmu.c
> +++ b/arch/mips/kvm/mmu.c
> @@ -592,7 +592,7 @@ static int kvm_mips_map_page(struct kvm_vcpu *vcpu, unsigned long gpa,
>  	gfn_t gfn = gpa >> PAGE_SHIFT;
>  	int srcu_idx, err;
>  	kvm_pfn_t pfn;
> -	pte_t *ptep, entry, old_pte;
> +	pte_t *ptep, entry;
>  	bool writeable;
>  	unsigned long prot_bits;
>  	unsigned long mmu_seq;
> @@ -664,7 +664,6 @@ static int kvm_mips_map_page(struct kvm_vcpu *vcpu, unsigned long gpa,
>  	entry = pfn_pte(pfn, __pgprot(prot_bits));
>  
>  	/* Write the PTE */
> -	old_pte = *ptep;
>  	set_pte(ptep, entry);

Heh, 7 year old bug gets two fixes within a few days :-)

https://lore.kernel.org/all/20231010085434.2678144-1-chenhuacai@loongson.cn