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

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Message-ID: <b2e6fc81-a956-46f7-9a44-a707064c24a2@email.android.com>
Date:	Tue, 10 Dec 2013 17:06:36 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Xishi Qiu <qiuxishi@...wei.com>,
	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()

Ok, the issue I thought we were discussing was actually [A,B) [B,C) [C,D) ...

Yinghai Lu <yinghai@...nel.org> wrote:
>On Tue, Dec 10, 2013 at 2:51 PM, H. Peter Anvin <hpa@...or.com> wrote:
>> On 12/10/2013 01:52 PM, Yinghai Lu wrote:
>>>>
>>>> What happens if it spans more than two regions?
>>>
>>> [A, B), [B+1, C), [C+1, D) ?
>>> start in [A, B), and end in [C+1, D).
>>>
>>> old code:
>>> first with [A, B), start set to B.
>>> then with [B+1, C), start still keep as B.
>>> then with [C+1, D), start still keep as B.
>>> at last still return 0...aka not_all_mapped.
>>>
>>> old code is still right.
>>>
>>
>> Why not_all_mapped?
>
>[B, B+1), and [C, C+1) are not there.

-- 
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