Messages in this thread |  | | | Date | Fri, 25 Apr 2008 17:06:12 -0700 | | From | "H. Peter Anvin" <> | | 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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