Re: [PATCH -mm 0/3] i386 boot: replace boot_ioremap with enhancedbt_ioremap

[H. Peter Anvin]

Ingo Molnar wrote:
> * H. Peter Anvin <hpa@xxxxxxxxx> wrote:
>
> > 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.
>
> i think that in general making access to unmapped memory a bit easier is 
> generally a good robustness idea as ACPI could be impacted by it as 
> well.
>
> Fundamentally, paging_init() has obvious dependency on "figuring out the 
> memory setup" of the box, and "figuring out the memory setup" means 
> interpreting various data structures passed in by the BIOS - some of 
> which might be in not yet mapped areas or iommu areas (if we have to do 
> some early quirk). So having a robust implementation of ioremap_early() 
> sounds like a definitive plus.

Fair enough.  If it's generally useful, I certainly have no objections.

	-hpa
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