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SubjectRe: [PATCH -mm 0/3] i386 boot: replace boot_ioremap with enhanced bt_ioremap
Ingo Molnar wrote:
> * H. Peter Anvin <hpa@zytor.com> wrote:
>
>> I did a quick scan over the patchset (not quite awake yet, so I may
>> very well have missed something), but it looks like EFI (again!) is
>> the only user of ioremapping before paging_init(). This makes me
>> wonder if that code can't be restructured so that isn't necessary.
>
> i think that in general making access to unmapped memory a bit easier is
> generally a good robustness idea as ACPI could be impacted by it as
> well.
>
> Fundamentally, paging_init() has obvious dependency on "figuring out the
> memory setup" of the box, and "figuring out the memory setup" means
> interpreting various data structures passed in by the BIOS - some of
> which might be in not yet mapped areas or iommu areas (if we have to do
> some early quirk). So having a robust implementation of ioremap_early()
> sounds like a definitive plus.
>

Fair enough. If it's generally useful, I certainly have no objections.

-hpa


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