From: Roman Zippel This adds the frequency part to ntp_update_frequency(). Signed-off-by: Roman Zippel Cc: john stultz Signed-off-by: Andrew Morton --- kernel/time/ntp.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff -puN kernel/time/ntp.c~ntp-add-time_freq-to-tick-length kernel/time/ntp.c --- a/kernel/time/ntp.c~ntp-add-time_freq-to-tick-length +++ a/kernel/time/ntp.c @@ -37,8 +37,7 @@ long time_tolerance = MAXFREQ; /* frequ long time_precision = 1; /* clock precision (us) */ long time_maxerror = NTP_PHASE_LIMIT; /* maximum error (us) */ long time_esterror = NTP_PHASE_LIMIT; /* estimated error (us) */ -long time_freq = (((NSEC_PER_SEC + HZ/2) % HZ - HZ/2) << SHIFT_USEC) / NSEC_PER_USEC; - /* frequency offset (scaled ppm)*/ +long time_freq; /* frequency offset (scaled ppm)*/ long time_reftime; /* time at last adjustment (s) */ long time_adjust; long time_next_adjust; @@ -67,6 +66,7 @@ void ntp_update_frequency(void) { tick_length_base = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ) << TICK_LENGTH_SHIFT; tick_length_base += (s64)CLOCK_TICK_ADJUST << TICK_LENGTH_SHIFT; + tick_length_base += ((s64)time_freq * NSEC_PER_USEC) << (TICK_LENGTH_SHIFT - SHIFT_USEC); do_div(tick_length_base, HZ); @@ -163,8 +163,6 @@ void second_overflow(void) * Compute the frequency estimate and additional phase adjustment due * to frequency error for the next second. */ - ltemp = time_freq; - time_adj += shift_right(ltemp,(SHIFT_USEC + SHIFT_HZ - SHIFT_SCALE)); #if HZ == 100 /* @@ -389,7 +387,7 @@ int do_adjtimex(struct timex *txc) if (txc->modes & ADJ_TICK) tick_usec = txc->tick; - if (txc->modes & ADJ_TICK) + if (txc->modes & (ADJ_TICK|ADJ_FREQUENCY|ADJ_OFFSET)) ntp_update_frequency(); } /* txc->modes */ leave: if ((time_status & (STA_UNSYNC|STA_CLOCKERR)) != 0) _