perf_counter tools: when no command is feed to perfstat, display help…

… and exit Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
git-mirror · Apr 6, 2009 · af9522c · af9522c
1 parent dda7c02
commit af9522c
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/Documentation/perf_counter/kerneltop.c b/Documentation/perf_counter/kerneltop.c
@@ -387,6 +387,9 @@ int do_perfstat(int argc, char *argv[])
 	argc -= optind;
 	argv += optind;
 
+	if (!argc)
+		display_help();
+
 	/*
 	 * Enable counters and exec the command:
 	 */