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Extend the existing regression test framework for s390x CPU subfunctions to include tests for the Perform Locked Operation (PLO) subfunction functions. PLO was introduced in the very first 64-bit machine generation. Hence it is assumed PLO is always installed in the Z Arch. The test procedure follows the established pattern. Suggested-by: Janosch Frank <frankja@linux.ibm.com> Signed-off-by: Hariharan Mari <hari55@linux.ibm.com> Reviewed-by: Janosch Frank <frankja@linux.ibm.com> Reviewed-by: Christoph Schlameuss <schlameuss@linux.ibm.com> Link: https://lore.kernel.org/r/20240823130947.38323-6-hari55@linux.ibm.com Signed-off-by: Janosch Frank <frankja@linux.ibm.com> Message-ID: <20240823130947.38323-6-hari55@linux.ibm.com>