From e13a2e61dd5152f5499d2003470acf9c838eab84 Mon Sep 17 00:00:00 2001 From: john stultz Date: Sun, 10 Feb 2008 10:48:03 +0100 Subject: [PATCH] ntp: correct inconsistent interval/tick_length usage clocksource initialization and error accumulation. This corrects a 280ppm drift seen on some systems using acpi_pm, and affects other clocksources as well (likely to a lesser degree). Signed-off-by: John Stultz Cc: Roman Zippel Cc: Steven Rostedt Signed-off-by: Andrew Morton Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- include/linux/timex.h | 9 ++++++++- kernel/time/ntp.c | 4 ---- 2 files changed, 8 insertions(+), 5 deletions(-) diff --git a/include/linux/timex.h b/include/linux/timex.h index 8ea3e71ba7f..c3f374786a4 100644 --- a/include/linux/timex.h +++ b/include/linux/timex.h @@ -232,7 +232,14 @@ static inline int ntp_synced(void) #else #define NTP_INTERVAL_FREQ (HZ) #endif -#define NTP_INTERVAL_LENGTH (NSEC_PER_SEC/NTP_INTERVAL_FREQ) + +#define CLOCK_TICK_OVERFLOW (LATCH * HZ - CLOCK_TICK_RATE) +#define CLOCK_TICK_ADJUST (((s64)CLOCK_TICK_OVERFLOW * NSEC_PER_SEC) / \ + (s64)CLOCK_TICK_RATE) + +/* Because using NSEC_PER_SEC would be too easy */ +#define NTP_INTERVAL_LENGTH ((((s64)TICK_USEC * NSEC_PER_USEC * USER_HZ) + \ + CLOCK_TICK_ADJUST) / NTP_INTERVAL_FREQ) /* Returns how long ticks are at present, in ns / 2^(SHIFT_SCALE-10). */ extern u64 current_tick_length(void); diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index e64efaf957e..c88b5910e7a 100644 --- a/kernel/time/ntp.c +++ b/kernel/time/ntp.c @@ -43,10 +43,6 @@ long time_freq; /* frequency offset (scaled ppm)*/ static long time_reftime; /* time at last adjustment (s) */ long time_adjust; -#define CLOCK_TICK_OVERFLOW (LATCH * HZ - CLOCK_TICK_RATE) -#define CLOCK_TICK_ADJUST (((s64)CLOCK_TICK_OVERFLOW * NSEC_PER_SEC) / \ - (s64)CLOCK_TICK_RATE) - static void ntp_update_frequency(void) { u64 second_length = (u64)(tick_usec * NSEC_PER_USEC * USER_HZ) -- 2.41.1