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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