On 09/30/09 23:40, Jan Beulich wrote:
>> Hm, _PAGE_IOMAP is x86-specific. I guess that doesn't matter in this
>> case, but it would for other drivers. Previously _PAGE_IOMAP was set in
>> vm_get_page_prot -> arch_vm_get_page_prot. Is that path no longer being
>> used? It looks like it should be.
>>
> No, that path can't be the right one: Based on what VM_* flag would you
> want to set _PAGE_IOMAP? VM_IO is definitely not the right one - I
> checked this with Nick when analyzing the crash we got reported.
>
> Further, no arch besides powerpc actually defines arch_vm_get_page_prot()
> in mainline, and in xen/master the definition indeed is (incorrectly) using
> VM_IO.
Why, what's wrong with VM_IO? It's documented as being "Memory mapped
I/O or similar". VM_PFNMAP is another option, but that seems more
dubious. Are there places where VM_IO is being legitimately set on
normal page mappings?
J
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