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authorRoman Zippel <zippel@linux-m68k.org>2006-09-30 23:28:27 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-01 00:39:27 -0700
commit04b617e71e363e640e88be1e43f53fa6a3afef9f (patch)
treeb59e8e75e4671bc5e10f4fcaace85d4658d4d0f0 /include
parent97eebe138caaf78354b1fad233e63bafdcc4fd54 (diff)
downloadop-kernel-dev-04b617e71e363e640e88be1e43f53fa6a3afef9f.zip
op-kernel-dev-04b617e71e363e640e88be1e43f53fa6a3afef9f.tar.gz
[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')
-rw-r--r--include/linux/timex.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/timex.h b/include/linux/timex.h
index 7715b4c..671609e 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 */
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