From af9522cf133e9be6da8525a46a9ed7e7659f0e1a Mon Sep 17 00:00:00 2001
From: Wu Fengguang <fengguang.wu@intel.com>
Date: Fri, 20 Mar 2009 10:08:10 +0800
Subject: [PATCH] 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>
---
 Documentation/perf_counter/kerneltop.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/perf_counter/kerneltop.c b/Documentation/perf_counter/kerneltop.c
index 0bd3c13150b1..81a68aac137f 100644
--- 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:
 	 */
-- 
2.20.1