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Subject: Re: [PATCH] mm,x86: fix span coverage in e820_all_mapped()
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Tue, 10 Dec 2013 21:27:16 -0800
To: Xishi Qiu <qiuxishi@huawei.com>
CC: Yinghai Lu <yinghai@kernel.org>, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        the arch/x86 maintainers <x86@kernel.org>, Linn Crosetto <linn@hp.com>,
        Pekka Enberg <penberg@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Linux MM <linux-mm@kvack.org>
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Is that an actual requirement of the API?

Xishi Qiu <qiuxishi@huawei.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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