tools/rtla: Replace osnoise_hist_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_hist_usage("...") with fatal("...") on errors.

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

Signed-off-by: Costa Shulyupin <costa.shul@redhat.com>
Reviewed-by: Tomas Glozar <tglozar@redhat.com>
Link: https://lore.kernel.org/r/20251011082738.173670-6-costa.shul@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>

diff --git a/tools/tracing/rtla/src/osnoise_hist.c b/tools/tracing/rtla/src/osnoise_hist.c
index d30a9a03b76473cb4d7428e17d8eb266fb8f5652..1d841a3056bc9ed788281f4af3fd5f991e351873 100644 (file)
--- a/tools/tracing/rtla/src/osnoise_hist.c
+++ b/tools/tracing/rtla/src/osnoise_hist.c
@@ -407,7 +407,7 @@ osnoise_print_stats(struct osnoise_tool *tool)
 /*
  * osnoise_hist_usage - prints osnoise hist usage message
  */
-static void osnoise_hist_usage(char *usage)
+static void osnoise_hist_usage(void)
 {
        int i;
 
@@ -453,18 +453,12 @@ static void osnoise_hist_usage(char *usage)
                NULL,
        };
 
-       if (usage)
-               fprintf(stderr, "%s\n", usage);
-
        fprintf(stderr, "rtla osnoise hist: a per-cpu histogram of the OS noise (version %s)\n",
                        VERSION);
 
        for (i = 0; msg[i]; i++)
                fprintf(stderr, "%s\n", msg[i]);
 
-       if (usage)
-               exit(EXIT_FAILURE);
-
        exit(EXIT_SUCCESS);
 }
 
@@ -547,12 +541,12 @@ static struct common_params
                        params->common.hist.bucket_size = get_llong_from_str(optarg);
                        if (params->common.hist.bucket_size == 0 ||
                            params->common.hist.bucket_size >= 1000000)
-                               osnoise_hist_usage("Bucket size needs to be > 0 and <= 1000000\n");
+                               fatal("Bucket size needs to be > 0 and <= 1000000");
                        break;
                case 'c':
                        retval = parse_cpu_set(optarg, &params->common.monitored_cpus);
                        if (retval)
-                               osnoise_hist_usage("\nInvalid -c cpu list\n");
+                               fatal("Invalid -c cpu list");
                        params->common.cpus = optarg;
                        break;
                case 'C':
@@ -571,7 +565,7 @@ static struct common_params
                case 'd':
                        params->common.duration = parse_seconds_duration(optarg);
                        if (!params->common.duration)
-                               osnoise_hist_usage("Invalid -D duration\n");
+                               fatal("Invalid -D duration");
                        break;
                case 'e':
                        tevent = trace_event_alloc(optarg);
@@ -587,11 +581,11 @@ static struct common_params
                        params->common.hist.entries = get_llong_from_str(optarg);
                        if (params->common.hist.entries < 10 ||
                            params->common.hist.entries > 9999999)
-                               osnoise_hist_usage("Entries must be > 10 and < 9999999\n");
+                               fatal("Entries must be > 10 and < 9999999");
                        break;
                case 'h':
                case '?':
-                       osnoise_hist_usage(NULL);
+                       osnoise_hist_usage();
                        break;
                case 'H':
                        params->common.hk_cpus = 1;
@@ -602,18 +596,18 @@ static struct common_params
                case 'p':
                        params->period = get_llong_from_str(optarg);
                        if (params->period > 10000000)
-                               osnoise_hist_usage("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_hist_usage("Invalid -P priority");
+                               fatal("Invalid -P priority");
                        params->common.set_sched = 1;
                        break;
                case 'r':
                        params->runtime = get_llong_from_str(optarg);
                        if (params->runtime < 100)
-                               osnoise_hist_usage("Runtime shorter than 100 us\n");
+                               fatal("Runtime shorter than 100 us");
                        break;
                case 's':
                        params->common.stop_us = get_llong_from_str(optarg);
@@ -653,7 +647,7 @@ static struct common_params
                                if (retval)
                                        fatal("Error adding trigger %s", optarg);
                        } else {
-                               osnoise_hist_usage("--trigger requires a previous -e\n");
+                               fatal("--trigger requires a previous -e");
                        }
                        break;
                case '5': /* filter */
@@ -662,7 +656,7 @@ static struct common_params
                                if (retval)
                                        fatal("Error adding filter %s", optarg);
                        } else {
-                               osnoise_hist_usage("--filter requires a previous -e\n");
+                               fatal("--filter requires a previous -e");
                        }
                        break;
                case '6':
@@ -684,7 +678,7 @@ static struct common_params
                                fatal("Invalid action %s", optarg);
                        break;
                default:
-                       osnoise_hist_usage("Invalid option");
+                       fatal("Invalid option");
                }
        }
 
@@ -695,7 +689,7 @@ static struct common_params
                fatal("rtla needs root permission");
 
        if (params->common.hist.no_index && !params->common.hist.with_zeros)
-               osnoise_hist_usage("no-index set and with-zeros not set - it does not make sense");
+               fatal("no-index set and with-zeros not set - it does not make sense");
 
        return &params->common;
 }