From: "H. Peter Anvin" <hpa@zytor.com>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Xishi Qiu <qiuxishi@huawei.com>,
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>
Subject: Re: [PATCH] mm,x86: fix span coverage in e820_all_mapped()
Date: Tue, 10 Dec 2013 14:51:57 -0800 [thread overview]
Message-ID: <52A79B0D.4090303@zytor.com> (raw)
In-Reply-To: <CAE9FiQU8Y_thGxZamz0Uwt4FGXh7KJu7jGP8ED3dbjQuyq7vcQ@mail.gmail.com>
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?
-hpa
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WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Xishi Qiu <qiuxishi@huawei.com>,
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>
Subject: Re: [PATCH] mm,x86: fix span coverage in e820_all_mapped()
Date: Tue, 10 Dec 2013 14:51:57 -0800 [thread overview]
Message-ID: <52A79B0D.4090303@zytor.com> (raw)
In-Reply-To: <CAE9FiQU8Y_thGxZamz0Uwt4FGXh7KJu7jGP8ED3dbjQuyq7vcQ@mail.gmail.com>
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?
-hpa
next prev parent reply other threads:[~2013-12-10 22:52 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-10 9:06 [PATCH] mm,x86: fix span coverage in e820_all_mapped() Xishi Qiu
2013-12-10 9:06 ` Xishi Qiu
2013-12-10 21:06 ` Yinghai Lu
2013-12-10 21:06 ` Yinghai Lu
2013-12-10 21:29 ` H. Peter Anvin
2013-12-10 21:29 ` H. Peter Anvin
2013-12-10 21:52 ` Yinghai Lu
2013-12-10 21:52 ` Yinghai Lu
2013-12-10 22:51 ` H. Peter Anvin [this message]
2013-12-10 22:51 ` H. Peter Anvin
2013-12-11 0:35 ` Yinghai Lu
2013-12-11 0:35 ` Yinghai Lu
2013-12-11 1:06 ` H. Peter Anvin
2013-12-11 1:06 ` H. Peter Anvin
2013-12-11 1:42 ` Xishi Qiu
2013-12-11 1:42 ` Xishi Qiu
2013-12-11 1:35 ` Xishi Qiu
2013-12-11 1:35 ` Xishi Qiu
2013-12-11 2:55 ` H. Peter Anvin
2013-12-11 2:55 ` H. Peter Anvin
2013-12-11 3:55 ` Xishi Qiu
2013-12-11 3:55 ` Xishi Qiu
2013-12-11 4:02 ` H. Peter Anvin
2013-12-11 4:02 ` H. Peter Anvin
2013-12-11 4:39 ` Xishi Qiu
2013-12-11 4:39 ` Xishi Qiu
2013-12-11 5:27 ` H. Peter Anvin
2013-12-11 5:27 ` H. Peter Anvin
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