From 04b617e71e363e640e88be1e43f53fa6a3afef9f Mon Sep 17 00:00:00 2001 From: Roman Zippel Date: Sat, 30 Sep 2006 23:28:27 -0700 Subject: [PATCH] ntp: convert time_freq to nsec value This converts time_freq to a scaled nsec value and adds around 6bit of extra resolution. This pushes the time_freq to its 32bit limits so the calculatons have to be done with 64bit. Signed-off-by: Roman Zippel Cc: john stultz Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/timex.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux') diff --git a/include/linux/timex.h b/include/linux/timex.h index 7715b4c0caf9..671609ee1a3d 100644 --- a/include/linux/timex.h +++ b/include/linux/timex.h @@ -91,10 +91,12 @@ #define SHIFT_SCALE 22 /* phase scale (shift) */ #define SHIFT_UPDATE (SHIFT_HZ + 1) /* time offset scale (shift) */ #define SHIFT_USEC 16 /* frequency offset scale (shift) */ +#define SHIFT_NSEC 12 /* kernel frequency offset scale */ #define FINENSEC (1L << (SHIFT_SCALE - 10)) /* ~1 ns in phase units */ #define MAXPHASE 512000L /* max phase error (us) */ #define MAXFREQ (512L << SHIFT_USEC) /* max frequency error (ppm) */ +#define MAXFREQ_NSEC (512000L << SHIFT_NSEC) /* max frequency error (ppb) */ #define MINSEC 16L /* min interval between updates (s) */ #define MAXSEC 1200L /* max interval between updates (s) */ #define NTP_PHASE_LIMIT (MAXPHASE << 5) /* beyond max. dispersion */ -- cgit v1.2.3-59-g8ed1b