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DateFri, 25 Apr 2008 17:06:12 -0700
From"H. Peter Anvin" <>
SubjectRe: [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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