Re: Word-at-a-time dcache name accesses

[Andi Kleen]

"H. Peter Anvin" <hpa@xxxxxxxxx> 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.

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only
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