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) {