linux-kernel - Re: [patch] x86, pat: fix reserve

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Message-ID: <4967D223.1090703@zytor.com>
Date:	Fri, 09 Jan 2009 14:39:31 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
CC:	mingo@...e.hu, tglx@...utronix.de, venkatesh.pallipadi@...el.com,
	linux-kernel@...r.kernel.org, tvignaud@...driva.com
Subject: Re: [patch] x86, pat: fix reserve_memtype() for legacy 1MB range

Suresh Siddha wrote:
> 
> Here X is trying to map first 8KB of memory using /dev/mem. Existing
> code treats first 0-4KB of memory as non-RAM and 4KB-8KB as RAM. Recent
> code changes don't allow to map memory with different attributes
> at the same time.
> 

Why was 0-4 KB marked as non-RAM?  It is most definitely RAM, and should 
be WB.

	-hpa
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