Messages in this thread | | | Date | Thu, 17 Jan 2008 15:33:45 -0500 | From | "H. Peter Anvin" <> | Subject | Re: [patch 0/4] x86: PAT followup - Incremental changes and bug fixes |
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Ingo Molnar wrote: > * Andreas Herrmann3 <andreas.herrmann3@amd.com> 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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