pmem: convert to generic memremap
Kill arch_memremap_pmem() and just let the architecture specify the flags to be passed to memremap(). Default to writethrough by default. Suggested-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NRoss Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: NDan Williams <dan.j.williams@intel.com>
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