linux-kernel - Re: [PATCH] x86_64: update e820 instead of updating end

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Date:	Mon, 21 Jan 2008 14:14:34 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Andi Kleen <ak@...e.de>
CC:	Harvey Harrison <harvey.harrison@...il.com>,
	Yinghai Lu <Yinghai.Lu@....com>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jesse.barnes@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] x86_64: update e820 instead of updating end_pfn v2

Andi Kleen wrote:
>>> That change is good agreed, but I would suggest to put it into a separate
>>> patch with a description
>>>
>> Perhaps like this:
>>
>> if (l & (Tom2Enabled|Tom2ForceMemTypeWB))
>> 	return 1;
> 
> That's not equivalent.
> 
> -Andi
> 

The equivalence is:

if ((1 & Tom2Enabled) && (1 & Tom2ForceMemTypeWB))
	return 1;
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