Re: [patch 0/4] x86: PAT followup - Incremental changes and bug fixes

[H. Peter Anvin]

Ingo Molnar wrote:
> * Andreas Herrmann3 <andreas.herrmann3@xxxxxxx> wrote:
>
> > For the failed devices I get:
> >
> >   sata_sil 0000:00:12.0: version 2.3
> >   ACPI: PCI Interrupt 0000:00:12.0[A] -> GSI 22 (level, low) -> IRQ 22
> >   ioremap_nocache: addr c0403000, size 200
> >   swapper:1 conflicting cache attribute c0403000-c0404000 uncached<->default
> >   ACPI: PCI interrupt for device 0000:00:12.0 disabled
>
> hm, is the problem that the two devices share the same physical page, 
> and thus get an overlapping area?
>
> as an intermediate fix, how about following the attribute of the already 
> existing mapping, instead of rejecting the ioremap due to the conflict? 
> I.e. something like below?

The correct behaviour probably would be to go with the most restrictive 
caching behaviour, i.e. uncached in this case.

	-hpa
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