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    SubjectRe: [PATCH -mm 0/3] i386 boot: replace boot_ioremap with enhanced bt_ioremap
    Huang, Ying wrote:
    > After checking the early_ioremap() implementation in
    > arch/x86/kernel/setup_32.c, I found that it is a duplication of
    > bt_ioremap() implementation in arch/x86/mm/ioremap_32.c. Both
    > implementations use set_fixmap(), so they can be used only after
    > paging_init().
    > The early_ioremap implementation provided in this patchset works as
    > follow:
    > - Enhances bt_ioremap, make it usable before paging_init() via a
    > dedicated PTE page.
    > - Rename bt_ioremap to early_ioremap
    > So I think maybe we should replace the early_ioremap() implementation in
    > PAT series with that of this series.

    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.


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