linux-kernel - Re: [PATCH] KVM: x86/mmu: Remove unused "type" of split_page

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Date:   Mon, 13 Jun 2022 10:47:53 +0800
From:   Xiaoyao Li <xiaoyao.li@...el.com>
To:     sunliming <sunliming@...inos.cn>, isaku.yamahata@...el.com,
        pbonzini@...hat.com, seanjc@...gle.com, mingo@...nel.org
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        kelulanainsley@...il.com, x86@...nel.org,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] KVM: x86/mmu: Remove unused "type" of split_page_type()

On 6/12/2022 11:56 AM, sunliming wrote:
> The variable 'type' in split_page_type() is set but not used, so remove
> it.
> 
> Fixes the following w1 warning:
> 
> arch/x86/kvm/mmu/mmu.c:982:28: warning: variable 'type' set but not used [-Wunused-but-set-variable]

Please note, the code doesn't get into upstream yet.

The fix shouldn't be sent to upstream maillist.

> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: sunliming <sunliming@...inos.cn>
> ---
>   arch/x86/kvm/mmu/mmu.c | 2 --
>   1 file changed, 2 deletions(-)
> 
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index 7b3df91a93cf..f4d577335f94 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -979,14 +979,12 @@ static void split_page_type(gfn_t gfn, struct kvm_memory_slot *slot,
>   			    enum pg_level level)
>   {
>   	struct kvm_page_attr *page_attr = page_attr_slot(gfn, slot, level);
> -	enum kvm_page_type type;
>   	gfn_t base_gfn;
>   
>   	if (WARN_ON_ONCE(!kvm_page_type_valid(page_attr) || level <= PG_LEVEL_4K))
>   		return;
>   
>   	base_gfn = gfn & ~(KVM_PAGES_PER_HPAGE(level) - 1);
> -	type = page_attr->type;
>   
>   	/*
>   	 * Set the type to KVM_PAGE_TYPE_MIXED in advance since when a large