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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.

-hpa



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