linux-kernel - RE: [PATCH] x86/pat: no need to check overlaps with more than one entry in chk

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Date:	Wed, 18 Nov 2009 09:30:58 -0800
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	Xiaotian Feng <dfeng@...hat.com>, "x86@...nel.org" <x86@...nel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Subject: RE: [PATCH] x86/pat: no need to check overlaps with more than one
 entry in chk_conflict

>-----Original Message-----
>From: linux-kernel-owner@...r.kernel.org 
>[mailto:linux-kernel-owner@...r.kernel.org] On Behalf Of Xiaotian Feng
>Sent: Tuesday, November 17, 2009 6:48 PM
>To: x86@...nel.org
>Cc: linux-kernel@...r.kernel.org; Xiaotian Feng; Ingo Molnar; 
>Siddha, Suresh B; Pallipadi, Venkatesh
>Subject: [PATCH] x86/pat: no need to check overlaps with more 
>than one entry in chk_conflict
>
>memtype list is built via reserve_memtype, for the overlapped 
>areas, they're
>all the same type, otherwise reserve_memtype will fail to 
>insert it into the
>list. So there's no need to check overlaps with more than one 
>entry in the
>chk_conflict code.

NAK.

The reason we have to check for more than one entry is for the cases
like this.

New entry:                   s-------------------e
Existing entries:         s----e     s-----e   s----e
(s=start, e=end)

Thanks,
Venki--
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