mm: split altmap memory map allocation from normal case
No functional changes, just untangling the call chain and document why the altmap is passed around the hotplug code. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NLogan Gunthorpe <logang@deltatee.com> Signed-off-by: NDan Williams <dan.j.williams@intel.com>
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