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

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Message-ID: <52A787D0.2070400@zytor.com>
Date:	Tue, 10 Dec 2013 13:29:52 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>, Xishi Qiu <qiuxishi@...wei.com>
CC:	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 12/10/2013 01:06 PM, Yinghai Lu wrote:
> On Tue, Dec 10, 2013 at 1:06 AM, Xishi Qiu <qiuxishi@...wei.com> wrote:
>> In the following case, e820_all_mapped() will return 1.
>> A < start < B-1 and B < end < C, it means <start, end> spans two regions.
>> <start, end>:           [start - end]
>> e820 addr:          ...[A - B-1][B - C]...
> 
> should be [start, end) right?
> and
> [A, B),[B, C)
> 

What happens if it spans more than two regions?

	-hpa


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