linux-kernel - Re: [PATCH V2] x86/mm/pat: Do a small optimization and fix in reserve

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Date:	Tue, 21 Jul 2015 10:10:39 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Pan Xinhui <xinhuix.pan@...el.com>
cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	mingo@...hat.com, hpa@...or.com, x86@...nel.org, bp@...e.de,
	toshi.kani@...com, jgross@...e.com, mcgrof@...e.com,
	"mnipxh@....com" <mnipxh@....com>,
	"yanmin_zhang@...ux.intel.com" <yanmin_zhang@...ux.intel.com>
Subject: Re: [PATCH V2] x86/mm/pat: Do a small optimization and fix in
 reserve_memtype

On Tue, 21 Jul 2015, Pan Xinhui wrote:
> diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
> index 188e3e0..f3c49fa 100644
> --- a/arch/x86/mm/pat.c
> +++ b/arch/x86/mm/pat.c
> @@ -538,22 +538,20 @@ int reserve_memtype(u64 start, u64 end, enum page_cache_mode req_type,
>  	new->type	= actual_type;
>  
>  	spin_lock(&memtype_lock);
> -
>  	err = rbt_memtype_check_insert(new, new_type);
> +	actual_type = new->type;

What's the point of this? new->type is set to actual_type 5 lines above.

Thanks,

	tglx
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