timekeeping_cycles_to_ns
nsec_real = timekeeping_cycles_to_ns(&tk->tkr_mono, now);
nsec_raw = timekeeping_cycles_to_ns(&tk->tkr_raw, now);
nsec_real = timekeeping_cycles_to_ns(&tk->tkr_mono, cycles);
nsec_raw = timekeeping_cycles_to_ns(&tk->tkr_raw, cycles);
nsecs = timekeeping_cycles_to_ns(&aux_tks->tkr_mono, aux_tks->tkr_mono.cycle_last);
return timekeeping_cycles_to_ns(tkr, tk_clock_read(tkr));