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    SubjectRe: [PATCH -mm 0/3] i386 boot: replace boot_ioremap with enhanced bt_ioremap
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    On Tue, 2008-01-15 at 09:44 +0100, Ingo Molnar wrote:
    > * Huang, Ying <ying.huang@intel.com> wrote:
    >
    > > This patchset replaces boot_ioremap with a enhanced version of
    > > bt_ioremap and renames the bt_ioremap to early_ioremap. This reduces
    > > 12k from .init.data segment and increases the size of memory that can
    > > be re-mapped before paging_init to 64k.
    >
    > in latest x86.git#mm there's an early_ioremap() introduced as part of
    > the PAT series - available on both 32-bit and 64-bit. Could you take a
    > look at it and use that if it's OK for your purposes?

    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.

    Best Regards,
    Huang Ying



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