kselftests: timers: leap-a-day: Change default arguments to help test runs

Change default arguments for leap-a-day to always set the time
each iteration (rather then waiting for midnight UTC), and to
only run 10 interations (rather then infinite).

If one wants to wait for midnight UTC, they can use the new -w
flag, and we add a note to the argument help that -i -1 will
run infinitely.

Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Miroslav Lichvar <[email protected]>
Cc: Richard Cochran <[email protected]>
Cc: Prarit Bhargava <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: [email protected]
Signed-off-by: John Stultz <[email protected]>
Cc: stable <[email protected]> [4.13+]
Signed-off-by: Shuah Khan <[email protected]>

Author: johnstultz-work

tools/testing/selftests/timers/leap-a-day.c

@@ -179,18 +179,18 @@ int main(int argc, char **argv)
 	struct sigevent se;
 	struct sigaction act;
 	int signum = SIGRTMAX;
-	int settime = 0;
+	int settime = 1;
 	int tai_time = 0;
 	int insert = 1;
-	int iterations = -1;
+	int iterations = 10;
 	int opt;
 
 	/* Process arguments */
 	while ((opt = getopt(argc, argv, "sti:")) != -1) {
 		switch (opt) {
-		case 's':
-			printf("Setting time to speed up testing\n");
-			settime = 1;
+		case 'w':
+			printf("Only setting leap-flag, not changing time. It could take up to a day for leap to trigger.\n");
+			settime = 0;
 			break;
 		case 'i':
 			iterations = atoi(optarg);
@@ -199,9 +199,10 @@ int main(int argc, char **argv)
 			tai_time = 1;
 			break;
 		default:
-			printf("Usage: %s [-s] [-i <iterations>]\n", argv[0]);
-			printf("	-s: Set time to right before leap second each iteration\n");
-			printf("	-i: Number of iterations\n");
+			printf("Usage: %s [-w] [-i <iterations>]\n", argv[0]);
+			printf("	-w: Set flag and wait for leap second each iteration");
+			printf("	    (default sets time to right before leapsecond)\n");
+			printf("	-i: Number of iterations (-1 = infinite, default is 10)\n");
 			printf("	-t: Print TAI time\n");
 			exit(-1);
 		}