Messages in this thread | | | Date | Fri, 25 Apr 2008 17:06:12 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [git pull] x86 PAT changes |
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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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