linux-kernel - Re: [PATCH V3 1/4] kvm: remove redundant reserved page check

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Date:   Thu, 9 Aug 2018 05:13:41 -0400 (EDT)
From:   Pankaj Gupta <pagupta@...hat.com>
To:     Zhang Yi <yi.z.zhang@...ux.intel.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nvdimm@...ts.01.org, pbonzini@...hat.com,
        dan j williams <dan.j.williams@...el.com>, jack@...e.cz,
        hch@....de, yu c zhang <yu.c.zhang@...el.com>, linux-mm@...ck.org,
        rkrcmar@...hat.com, yi z zhang <yi.z.zhang@...el.com>
Subject: Re: [PATCH V3 1/4] kvm: remove redundant reserved page check


> 
> PageReserved() is already checked inside kvm_is_reserved_pfn(),
> remove it from kvm_set_pfn_dirty().
> 
> Signed-off-by: Zhang Yi <yi.z.zhang@...ux.intel.com>
> Signed-off-by: Zhang Yu <yu.c.zhang@...ux.intel.com>
> ---
>  virt/kvm/kvm_main.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 8b47507f..c44c406 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -1690,12 +1690,8 @@ EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
>  
>  void kvm_set_pfn_dirty(kvm_pfn_t pfn)
>  {
> -	if (!kvm_is_reserved_pfn(pfn)) {
> -		struct page *page = pfn_to_page(pfn);
> -
> -		if (!PageReserved(page))
> -			SetPageDirty(page);
> -	}
> +	if (!kvm_is_reserved_pfn(pfn))
> +		SetPageDirty(pfn_to_page(pfn));
>  }
>  EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);

Acked-by: Pankaj Gupta <pagupta@...hat.com>

>  
> --
> 2.7.4
> 
>