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Region creation based on Type3 devices can be triggered from user space allowing memory combination through interleaving. In preparation for kernel driven region creation, that is Type2 drivers triggering region creation backed with its advertised CXL memory, factor out a common helper from the user-sysfs region setup for interleave ways. Signed-off-by: Alejandro Lucero <alucerop@amd.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Reviewed-by: Gregory Price <gourry@gourry.net> Tested-by: Gregory Price <gourry@gourry.net> Reviewed-by: Alison Schofield <alison.schofield@intel.com> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Link: https://patch.msgid.link/20260228173603.1125109-3-alejandro.lucero-palau@amd.com Signed-off-by: Dave Jiang <dave.jiang@intel.com>