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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