selftests: intel_pstate: return Kselftest Skip code for skipped tests

When intel_pstate test is skipped because of unmet dependencies and/or
unsupported configuration, it returns 0 which is treated as a pass
by the Kselftest framework. This leads to false positive result even
when the test could not be run.

Change it to return kselftest skip code when a test gets skipped to
clearly report that the test could not be run.

Kselftest framework SKIP code is 4 and the framework prints appropriate
messages to indicate that the test is skipped.

Signed-off-by: Shuah Khan (Samsung OSG) <[e-mail]>

tools/testing/selftests/intel_pstate/run.sh

···
 
 EVALUATE_ONLY=0
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 if ! uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ | grep -q x86; then
 	echo "$0 # Skipped: Test can only run on x86 architectures."
-	exit 0
+	exit $ksft_skip
 fi
 
 max_cpus=$(($(nproc)-1))