On Fri, Aug 14, 2015 at 02:52:15PM -0700, Dan Williams wrote:
> The idea is that this memory is not meant to be available to the page
> allocator and should not count as new memory capacity.  We're only
> hotplugging it to get struct page coverage.

This might need a bigger audit of the max_pfn usages.  I remember
architectures using it as a decisions for using IOMMUs or similar.
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