USECS_PER_SEC      67 tools/testing/selftests/timers/posix_timers.c 	diff += (end.tv_sec - start.tv_sec) * USECS_PER_SEC;
USECS_PER_SEC      69 tools/testing/selftests/timers/posix_timers.c 	if (abs(diff - DELAY * USECS_PER_SEC) > USECS_PER_SEC / 2) {