tools/rtla: Replace osnoise_top_usage("...") with fatal("...")

A long time ago, when the usage help was short, it was a favor
to the user to show it on error. Now that the usage help has
become very long, it is too noisy to dump the complete help text
for each typo after the error message itself.

Replace osnoise_top_usage("...") with fatal("...") on errors.

Remove the already unused 'usage' argument from osnoise_top_usage().

Signed-off-by: Costa Shulyupin <costa.shul@redhat.com>
Reviewed-by: Tomas Glozar <tglozar@redhat.com>
Link: https://lore.kernel.org/r/20251011082738.173670-5-costa.shul@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>

Author: makelinux

tools/tracing/rtla/src/osnoise_top.c

@@ -255,7 +255,7 @@ osnoise_print_stats(struct osnoise_tool *top)
 /*
  * osnoise_top_usage - prints osnoise top usage message
  */
-static void osnoise_top_usage(struct osnoise_params *params, char *usage)
+static void osnoise_top_usage(struct osnoise_params *params)
 {
 	int i;
 
@@ -294,9 +294,6 @@ static void osnoise_top_usage(struct osnoise_params *params, char *usage)
 		NULL,
 	};
 
-	if (usage)
-		fprintf(stderr, "%s\n", usage);
-
 	if (params->mode == MODE_OSNOISE) {
 		fprintf(stderr,
 			"rtla osnoise top: a per-cpu summary of the OS noise (version %s)\n",
@@ -316,9 +313,6 @@ static void osnoise_top_usage(struct osnoise_params *params, char *usage)
 	for (i = 0; msg[i]; i++)
 		fprintf(stderr, "%s\n", msg[i]);
 
-	if (usage)
-		exit(EXIT_FAILURE);
-
 	exit(EXIT_SUCCESS);
 }
 
@@ -398,7 +392,7 @@ struct common_params *osnoise_top_parse_args(int argc, char **argv)
 		case 'c':
 			retval = parse_cpu_set(optarg, &params->common.monitored_cpus);
 			if (retval)
-				osnoise_top_usage(params, "\nInvalid -c cpu list\n");
+				fatal("Invalid -c cpu list");
 			params->common.cpus = optarg;
 			break;
 		case 'C':
@@ -417,7 +411,7 @@ struct common_params *osnoise_top_parse_args(int argc, char **argv)
 		case 'd':
 			params->common.duration = parse_seconds_duration(optarg);
 			if (!params->common.duration)
-				osnoise_top_usage(params, "Invalid -d duration\n");
+				fatal("Invalid -d duration");
 			break;
 		case 'e':
 			tevent = trace_event_alloc(optarg);
@@ -431,7 +425,7 @@ struct common_params *osnoise_top_parse_args(int argc, char **argv)
 			break;
 		case 'h':
 		case '?':
-			osnoise_top_usage(params, NULL);
+			osnoise_top_usage(params);
 			break;
 		case 'H':
 			params->common.hk_cpus = 1;
@@ -442,12 +436,12 @@ struct common_params *osnoise_top_parse_args(int argc, char **argv)
 		case 'p':
 			params->period = get_llong_from_str(optarg);
 			if (params->period > 10000000)
-				osnoise_top_usage(params, "Period longer than 10 s\n");
+				fatal("Period longer than 10 s");
 			break;
 		case 'P':
 			retval = parse_prio(optarg, &params->common.sched_param);
 			if (retval == -1)
-				osnoise_top_usage(params, "Invalid -P priority");
+				fatal("Invalid -P priority");
 			params->common.set_sched = 1;
 			break;
 		case 'q':
@@ -456,7 +450,7 @@ struct common_params *osnoise_top_parse_args(int argc, char **argv)
 		case 'r':
 			params->runtime = get_llong_from_str(optarg);
 			if (params->runtime < 100)
-				osnoise_top_usage(params, "Runtime shorter than 100 us\n");
+				fatal("Runtime shorter than 100 us");
 			break;
 		case 's':
 			params->common.stop_us = get_llong_from_str(optarg);
@@ -484,7 +478,7 @@ struct common_params *osnoise_top_parse_args(int argc, char **argv)
 				if (retval)
 					fatal("Error adding trigger %s", optarg);
 			} else {
-				osnoise_top_usage(params, "--trigger requires a previous -e\n");
+				fatal("--trigger requires a previous -e");
 			}
 			break;
 		case '1': /* filter */
@@ -493,7 +487,7 @@ struct common_params *osnoise_top_parse_args(int argc, char **argv)
 				if (retval)
 					fatal("Error adding filter %s", optarg);
 			} else {
-				osnoise_top_usage(params, "--filter requires a previous -e\n");
+				fatal("--filter requires a previous -e");
 			}
 			break;
 		case '2':
@@ -515,7 +509,7 @@ struct common_params *osnoise_top_parse_args(int argc, char **argv)
 				fatal("Invalid action %s", optarg);
 			break;
 		default:
-			osnoise_top_usage(params, "Invalid option");
+			fatal("Invalid option");
 		}
 	}