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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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