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Commit 480b6837aa57 "nvdimm: fix PHYS_PFN/PFN_PHYS mixup" identified that we were passing an invalid address to devm_nvdimm_ioremap(). With that fixed it exposed a bug in the memory reservation size for flush hint tables. Since we map a full page we need to mock a full page of memory to back the flush hint table entries. Cc: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>