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

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Message-ID: <64518090-daf1-4382-8a9e-c56e55bfbd7b@email.android.com>
Date:	Tue, 10 Dec 2013 21:27:16 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Xishi Qiu <qiuxishi@...wei.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()

Is that an actual requirement of the API?

Xishi Qiu <qiuxishi@...wei.com> wrote:
>On 2013/12/11 12:02, H. Peter Anvin wrote:
>
>> On 12/10/2013 07:55 PM, Xishi Qiu wrote:
>>>
>>> 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.
>>>
>> 
>> Why is that a problem?
>> 
>
>[start, end) should be included in one region ?
>
>Thanks,
>Xishi Qiu
>
>> 	-hpa
>> 
>> 
>> 
>> 

-- 
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