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SubjectRe: [RFC Patch] use MTRR for write combining if PAT is not available

* Thomas Schlichter <thomas.schlichter@web.de> wrote:

> I don't think this is a good idea, Robert Hancock wrote there may be
> millions of such Laptops (Core Solo/Duo erratum AE7, Pentium M erratum
> Y31) :
>
> http://marc.info/?l=linux-kernel&m=125537136105246&w=2
>
> > or Perhaps just try to add mtrr only for the pci mmap case like the
> > 4th patch in this series..
>
> I'd prefer this! ;-)

Hm, we could perhaps do that - but i think we should only do that on
systems that have PAT disabled.

Which brings up the question of how to properly QA such a narrow segment
of the market. Maybe disabling CONFIG_X86_PAT should enable that logic
too.

Ingo


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