1 files changed, 3 insertions, 0 deletions

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:
          */