Messages in this thread | | | Date | Sat, 03 Mar 2012 10:47:43 -0800 | From | "H. Peter Anvin" <> | Subject | Re: Word-at-a-time dcache name accesses |
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On 03/03/2012 08:12 AM, Andi Kleen wrote: > "H. Peter Anvin" <hpa@zytor.com> writes: > >> On 03/02/2012 03:46 PM, Linus Torvalds wrote: >>> >>> Comments? >>> >> >> My biggest concern is what happens when this happens to be at the end of >> mapped kernel memory and we overrun the page? > > A long time ago (AMD K7ish) we had hardware bugs to work around in > this area. Overlapping into some PCI hole MMIO areas could cause obscure > hangs. That is why I was always careful to not do that in any x86 > library code. >
We still map too much, though. That's a separate problems which should be fixed in its own right, though.
-hpa
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