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authorRoman Zippel <zippel@linux-m68k.org>2006-09-30 23:28:22 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-01 00:39:26 -0700
commitb0ee75561beadc4db4d9a899c8ef4a7db50aa0ab (patch)
treee50354c74ce17f6ea78dc1d7fac608788de517f3 /kernel/timer.c
parent4c7ee8de956fc250fe31e2fa91f6da980fabe317 (diff)
downloadop-kernel-dev-b0ee75561beadc4db4d9a899c8ef4a7db50aa0ab.zip
op-kernel-dev-b0ee75561beadc4db4d9a899c8ef4a7db50aa0ab.tar.gz
[PATCH] ntp: add ntp_update_frequency
This introduces ntp_update_frequency() and deinlines ntp_clear() (as it's not performance critical). ntp_update_frequency() calculates the base tick length using tick_usec and adds a base adjustment, in case the frequency doesn't divide evenly by HZ. 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 'kernel/timer.c')
-rw-r--r--kernel/timer.c11
1 files changed, 4 insertions, 7 deletions
diff --git a/kernel/timer.c b/kernel/timer.c
index 5fccc7c..78d3fa1 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -562,12 +562,6 @@ found:
/******************************************************************/
-/*
- * Timekeeping variables
- */
-unsigned long tick_usec = TICK_USEC; /* USER_HZ period (usec) */
-unsigned long tick_nsec = TICK_NSEC; /* ACTHZ period (nsec) */
-
/*
* The current time
* wall_to_monotonic is what we need to add to xtime (or xtime corrected
@@ -757,10 +751,13 @@ void __init timekeeping_init(void)
unsigned long flags;
write_seqlock_irqsave(&xtime_lock, flags);
+
+ ntp_clear();
+
clock = clocksource_get_next();
clocksource_calculate_interval(clock, tick_nsec);
clock->cycle_last = clocksource_read(clock);
- ntp_clear();
+
write_sequnlock_irqrestore(&xtime_lock, flags);
}
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