linux-kernel - Re: [PATCH] mm,x86: fix span coverage in e820_all

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Message-ID: <52A7E223.9030605@huawei.com>
Date:	Wed, 11 Dec 2013 11:55:15 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linn Crosetto <linn@...com>, Pekka Enberg <penberg@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH] mm,x86: fix span coverage in e820_all_mapped()

On 2013/12/11 10:55, H. Peter Anvin wrote:

> On 12/10/2013 05:35 PM, Xishi Qiu wrote:
>>
>> In this case, old code is right, but I discuss in another one that
>> you wrote above.
>>
> 
> So is there a problem or not?  I have lost track...
> 

I think there is a problem.
e.g.
[start, end)=[8, 12), and [A, B)=[0, 10), [B, C)=[10,20),
then e820_all_mapped() will return 1, it spans two regions.

Thanks,
Xishi Qiu

> 	-hpa
> 
> 
> 
> 



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