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Add a helper to determine whether a given Soft Reserved memory range is fully contained within the committed CXL region. This helper provides a primitive for policy decisions in subsequent patches such as co-ordination with dax_hmem to determine whether CXL has fully claimed ownership of Soft Reserved memory ranges. Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Link: https://patch.msgid.link/20260322195343.206900-8-Smita.KoralahalliChannabasappa@amd.com Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Dave Jiang <dave.jiang@intel.com>