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In preparation for device-memory region creation, arrange for decoders of CXL_DEVTYPE_DEVMEM memdevs to default to CXL_DECODER_DEVMEM for their target type. Revisit this if a device ever shows up that wants to offer mixed HDM-H (Host-Only Memory) and HDM-DB support, or an CXL_DEVTYPE_DEVMEM device that supports HDM-H. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Link: https://lore.kernel.org/r/168679261945.3436160.11673393474107374595.stgit@dwillia2-xfh.jf.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>