linux-kernel - [PATCH v1 5/5] tools/rtla: Replace osnoise_top

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Message-ID: <20251008195905.333514-6-costa.shul@redhat.com>
Date: Wed,  8 Oct 2025 22:59:05 +0300
From: Costa Shulyupin <costa.shul@...hat.com>
To: Steven Rostedt <rostedt@...dmis.org>,
	Tomas Glozar <tglozar@...hat.com>,
	Costa Shulyupin <costa.shul@...hat.com>,
	Crystal Wood <crwood@...hat.com>,
	John Kacur <jkacur@...hat.com>,
	Jan Stancek <jstancek@...hat.com>,
	Tiezhu Yang <yangtiezhu@...ngson.cn>,
	linux-trace-kernel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 5/5] 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@...hat.com>
---
 tools/tracing/rtla/src/osnoise_top.c | 28 +++++++++++-----------------
 1 file changed, 11 insertions(+), 17 deletions(-)

diff --git a/tools/tracing/rtla/src/osnoise_top.c b/tools/tracing/rtla/src/osnoise_top.c
index 43fb50b5d936..604a068ed77f 100644
--- a/tools/tracing/rtla/src/osnoise_top.c
+++ b/tools/tracing/rtla/src/osnoise_top.c
@@ -257,7 +257,7 @@ 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;
 
@@ -296,9 +296,6 @@ 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",
@@ -318,9 +315,6 @@ 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);
 }
 
@@ -403,7 +397,7 @@ 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("\nInvalid -c cpu list\n");
 			params->common.cpus = optarg;
 			break;
 		case 'C':
@@ -422,12 +416,12 @@ 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\n");
 			break;
 		case 'e':
 			tevent = trace_event_alloc(optarg);
 			if (!tevent)
-				fatal("Error alloc trace event");
+				fatal("Error alloc trace event\n");
 
 			if (params->common.events)
 				tevent->next = params->common.events;
@@ -436,7 +430,7 @@ 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;
@@ -447,12 +441,12 @@ 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\n");
 			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\n");
 			params->common.set_sched = 1;
 			break;
 		case 'q':
@@ -461,7 +455,7 @@ 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\n");
 			break;
 		case 's':
 			params->common.stop_us = get_llong_from_str(optarg);
@@ -489,7 +483,7 @@ struct common_params *osnoise_top_parse_args(int argc, char **argv)
 				if (retval)
 					fatal("Error adding trigger %s\n", optarg);
 			} else {
-				osnoise_top_usage(params, "--trigger requires a previous -e\n");
+				fatal("--trigger requires a previous -e\n");
 			}
 			break;
 		case '1': /* filter */
@@ -498,7 +492,7 @@ struct common_params *osnoise_top_parse_args(int argc, char **argv)
 				if (retval)
 					fatal("Error adding filter %s\n", optarg);
 			} else {
-				osnoise_top_usage(params, "--filter requires a previous -e\n");
+				fatal("--filter requires a previous -e\n");
 			}
 			break;
 		case '2':
@@ -520,7 +514,7 @@ struct common_params *osnoise_top_parse_args(int argc, char **argv)
 				fatal("Invalid action %s\n", optarg);
 			break;
 		default:
-			osnoise_top_usage(params, "Invalid option");
+			fatal("Invalid option\n");
 		}
 	}
 
-- 
2.51.0