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| author | Roman Zippel <zippel@linux-m68k.org> | 2006-09-30 23:28:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-01 00:39:27 -0700 |
| commit | 04b617e71e363e640e88be1e43f53fa6a3afef9f (patch) | |
| tree | b59e8e75e4671bc5e10f4fcaace85d4658d4d0f0 /include/linux/timex.h | |
| parent | 97eebe138caaf78354b1fad233e63bafdcc4fd54 (diff) | |
| download | lwn-04b617e71e363e640e88be1e43f53fa6a3afef9f.tar.gz lwn-04b617e71e363e640e88be1e43f53fa6a3afef9f.zip | |
[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 <zippel@linux-m68k.org>
Cc: john stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/timex.h')
| -rw-r--r-- | include/linux/timex.h | 2 |
1 files changed, 2 insertions, 0 deletions
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 */ |