I have tested adjtick on arm64 juno-r2 device and it got pass and here is the test output on Linux version 4.14.221-rc1. + ./adjtick Each iteration takes about 15 seconds Estimating tick (act: 9000 usec, -100000 ppm): 9000 usec, -100000 ppm [OK] Estimating tick (act: 9250 usec, -75000 ppm): 9250 usec, -75000 ppm [OK] Estimating tick (act: 9500 usec, -50000 ppm): 9500 usec, -50000 ppm [OK] Estimating tick (act: 9750 usec, -25000 ppm): 9750 usec, -25001 ppm [OK] Estimating tick (act: 10000 usec, 0 ppm): 10000 usec, 0 ppm [OK] Estimating tick (act: 10250 usec, 25000 ppm): 10249 usec, 24999 ppm [OK] Estimating tick (act: 10500 usec, 50000 ppm): 10500 usec, 50000 ppm [OK] Estimating tick (act: 10750 usec, 75000 ppm): 10750 usec, 75000 ppm [OK] Pass 0 Fail 0 Xfail 0 Xpass 0 Skip 0 Error 0 1..0 output link, https://lkft.validation.linaro.org/scheduler/job/2254102#L1255 - Naresh