diff options
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/ntp.c | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index 2b758c935c65..7d281d9fbe30 100644 --- a/kernel/time/ntp.c +++ b/kernel/time/ntp.c @@ -77,24 +77,33 @@ static long ntp_tick_adj; * NTP methods: */ +/* + * Update (tick_length, tick_length_base, tick_nsec), based + * on (tick_usec, ntp_tick_adj, time_freq): + */ static void ntp_update_frequency(void) { - u64 old_tick_length_base = tick_length_base; - u64 second_length = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ) - << NTP_SCALE_SHIFT; - second_length += (s64)ntp_tick_adj << NTP_SCALE_SHIFT; - second_length += time_freq; + u64 prev_base; + u64 second_length; + + prev_base = tick_length_base; + + second_length = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ) + << NTP_SCALE_SHIFT; + + second_length += (s64)ntp_tick_adj << NTP_SCALE_SHIFT; + second_length += time_freq; - tick_length_base = second_length; + tick_length_base = second_length; - tick_nsec = div_u64(second_length, HZ) >> NTP_SCALE_SHIFT; - tick_length_base = div_u64(tick_length_base, NTP_INTERVAL_FREQ); + tick_nsec = div_u64(second_length, HZ) >> NTP_SCALE_SHIFT; + tick_length_base = div_u64(tick_length_base, NTP_INTERVAL_FREQ); /* * Don't wait for the next second_overflow, apply * the change to the tick length immediately */ - tick_length += tick_length_base - old_tick_length_base; + tick_length += tick_length_base - prev_base; } static void ntp_update_offset(long offset) |