Re: [Xen-devel] [PATCH v5 1/7] efi: Use early_mem*() instead of early_io*()

[Mark Salter <msalter@xxxxxxxxxx>]

On Wed, 2014-06-18 at 13:17 +0100, Matt Fleming wrote:
> Now, the only difference between early_memremap() and early_ioremap(),
> at least on x86, is PAGE_KERNEL vs. PAGE_KERNEL_IO, where PAGE_KERNEL_IO
> has the additional _PAGE_BIT_IOMAP bit set in the pte. But that's a
> software bit for x86.

I can't comment on the x86 MMU details, but using early_memremap() will
get rid of some sparse warnings in the current code.



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