1 files changed, 12 insertions, 2 deletions

diff --git a/Documentation/accounting/getdelays.c b/Documentation/accounting/getdelays.c
index e9126e794ed7..6207e2f59e3b 100644
--- a/Documentation/accounting/getdelays.c
+++ b/Documentation/accounting/getdelays.c
@@ -72,6 +72,16 @@ struct msgtemplate {
 
 char cpumask[100+6*MAX_CPUS];
 
+static void usage(void)
+{
+        fprintf(stderr, "getdelays [-dilv] [-w logfile] [-r bufsize] "
+                        "[-m cpumask] [-t tgid] [-p pid]\n");
+        fprintf(stderr, "  -d: print delayacct stats\n");
+        fprintf(stderr, "  -i: print IO accounting (works only with -p)\n");
+        fprintf(stderr, "  -l: listen forever\n");
+        fprintf(stderr, "  -v: debug on\n");
+}
+
 /*
  * Create a raw netlink socket and bind
  */
@@ -227,7 +237,7 @@ int main(int argc, char *argv[])
         struct msgtemplate msg;
 
         while (1) {
-                c = getopt(argc, argv, "diw:r:m:t:p:v:l");
+                c = getopt(argc, argv, "diw:r:m:t:p:vl");
                 if (c < 0)
                         break;
 
@@ -277,7 +287,7 @@ int main(int argc, char *argv[])
                         loop = 1;
                         break;
                 default:
-                        printf("Unknown option %d\n", c);
+                        usage();
                         exit(-1);
                 }
         }