Taskstats: fix getdelays usage information

Add usage to getdelays.c. This patch was originally posted by Randy Dunlap
http://lkml.org/lkml/2007/3/19/168

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/accounting/getdelays.c b/Documentation/accounting/getdelays.c
index e9126e794ed7c04c19c42fb318dd36295d8806da..6207e2f59e3be355d7349229cdb67514e7800c1d 100644 (file)
--- 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);
                }
        }