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core/region.c is overloaded with per-region control logic (pmem, dax, sysram, etc). Move the CXL DAX region device infrastructure from region.c into a new region_dax.c file. This will also allow us to add additional dax-driver integration paths that don't further dirty the core region.c logic. No functional changes. Signed-off-by: Gregory Price <gourry@gourry.net> Co-developed-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Alison Schofield <alison.schofield@intel.com> Link: https://patch.msgid.link/20260327020203.876122-3-gourry@gourry.net Signed-off-by: Dave Jiang <dave.jiang@intel.com>