Ingo Molnar wrote:
quoted text
> would be nice to have some debugging apparatus for bugs like this. 
> Perhaps artificially add a large pfn, then convert/unconvert, then 
> subtract it and expect the whole transformation to be an identity 
> mapping? This way we could simulate most of the effects of >4GB RAM, 
> right?

Yeah, good idea.  I'll code something up to run at pagetable init time 
or something.

    J

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