selftests/resctrl: Return MBA check result and make it to output message

Since MBA check result is not returned, the MBA test result message
is always output as "ok" regardless of whether the MBA check result is
true or false.

Make output message to be "not ok" if MBA check result is failed.

Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/resctrl/mba_test.c

@@ -56,10 +56,10 @@ static int mba_setup(int num, ...)
 	return 0;
 }
 
-static void show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc)
+static bool show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc)
 {
 	int allocation, runs;
-	bool failed = false;
+	bool ret = false;
 
 	ksft_print_msg("Results are displayed in (MB)\n");
 	/* Memory bandwidth from 100% down to 10% */
@@ -95,13 +95,15 @@ static void show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc)
 		ksft_print_msg("avg_bw_imc: %lu\n", avg_bw_imc);
 		ksft_print_msg("avg_bw_resc: %lu\n", avg_bw_resc);
 		if (avg_diff_per > MAX_DIFF_PERCENT)
-			failed = true;
+			ret = true;
 	}
 
 	ksft_print_msg("%s Check schemata change using MBA\n",
-		       failed ? "Fail:" : "Pass:");
-	if (failed)
+		       ret ? "Fail:" : "Pass:");
+	if (ret)
 		ksft_print_msg("At least one test failed\n");
+
+	return ret;
 }
 
 static int check_results(void)
@@ -137,9 +139,7 @@ static int check_results(void)
 
 	fclose(fp);
 
-	show_mba_info(bw_imc, bw_resc);
-
-	return 0;
+	return show_mba_info(bw_imc, bw_resc);
 }
 
 void mba_test_cleanup(void)