linux-kernel - Re: [git pull] x86 PAT changes

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Message-ID: <481271F4.7060401@zytor.com>
Date:	Fri, 25 Apr 2008 17:06:12 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [git pull] x86 PAT changes

Linus Torvalds wrote:
> 
> So why is PAT dependent on NONPROMISC_DEVMEM here?
> 
> It seems pointless and wrong. Somebody might want to have both the full 
> /dev/mem and PAT.
> 

The problem is that that can create cached/uncached aliases, which can 
cause some processors to lock up (especially AMD is known to have a lot 
of errata in this area.)

	-hpa
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