timespec64_sub
*boot_offset = timespec64_sub(*wall_time, boot_time);
ts = timespec64_sub(to, ts);
delta = timespec64_sub(next, now);
ts = timespec64_sub(ts2, ts1);
ts = timespec64_sub(*ts2, *ts1);
ts = timespec64_sub(*ts2, *ts1);
diff = timespec64_sub(ts, ptp_clock_time);
diff = timespec64_sub(port->agg_last, last);
diff = timespec64_sub(port->agg_last, port->agg_time);
delta = timespec64_sub(*e_ts, time_now);
delta = timespec64_sub(*e_ts, time_now);
struct timespec64 ts = timespec64_sub(*end, *start);
delta = timespec64_sub(old_system, old_rtc);
delta_delta = timespec64_sub(delta, old_delta);
old_system = timespec64_sub(old_system, delta_delta);
sleep_time = timespec64_sub(new_rtc, old_rtc);
sleep_time = timespec64_sub(sleep_time,
timespec64_sub(new_system, old_system));
val1 = timespec64_sub(val, stats->stats_timestamps.last_reset_time);
val2 = timespec64_sub(val, stats->stats_timestamps.last_read_time);
duration = timespec64_sub(end, start);
ts = timespec64_sub(ts, priv->base_time); \
rts = timespec64_sub(*end_time, rts);
now = timespec64_sub(*tv, now);
t = timespec64_sub(now, t);
ts->ts_real = timespec64_sub(ts->ts_real, delta);
ts->ts_raw = timespec64_sub(ts->ts_raw, delta);
*ts = timespec64_sub(*ts, ns_offsets->boottime);
freq_norm = pps_normalize_ts(timespec64_sub(*raw_ts, ntpdata->pps_fbase));
ts_delta = timespec64_sub(*ts, xt);
tk_set_wall_to_mono(tks, timespec64_sub(tks->wall_to_monotonic, ts_delta));
tk_set_wall_to_mono(tks, timespec64_sub(tks->wall_to_monotonic, *ts));
wall_to_mono = timespec64_sub(boot_offset, wall_time);
tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, *delta));
ts_delta = timespec64_sub(ts_new, timekeeping_suspend_time);
delta = timespec64_sub(tk_xtime(tks), timekeeping_suspend_time);
delta_delta = timespec64_sub(delta, old_delta);
timespec64_sub(tk->wall_to_monotonic, ts));
kunit_run_case_check_speed(test, test_case, timespec64_sub(end, start));
ts = timespec64_sub(ts1, ts0);
*timeout = timespec64_sub(end_time, timeout64);
tm = timespec64_sub(tm, tmr->last_update);