Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e13a2e61dd5152f5499d2003470acf9c838eab84
Commit: e13a2e61dd5152f5499d2003470acf9c838eab84
Parent: 25f666300625d894ebe04bac2b4b3aadb907c861
Author: john stultz <[EMAIL PROTECTED]>
AuthorDate: Sun Feb 10 10:48:03 2008 +0100
Committer: Thomas Gleixner <[EMAIL PROTECTED]>
CommitDate: Sun Feb 10 10:48:03 2008 +0100
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 <[EMAIL PROTECTED]>
Cc: Roman Zippel <[EMAIL PROTECTED]>
Cc: Steven Rostedt <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
---
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 8ea3e71..c3f3747 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 e64efaf..c88b591 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)
-
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