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| author | Roman Zippel <zippel@linux-m68k.org> | 2006-09-30 23:28:22 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-01 00:39:26 -0700 |
| commit | b0ee75561beadc4db4d9a899c8ef4a7db50aa0ab (patch) | |
| tree | e50354c74ce17f6ea78dc1d7fac608788de517f3 /kernel/timer.c | |
| parent | 4c7ee8de956fc250fe31e2fa91f6da980fabe317 (diff) | |
| download | olio-linux-3.10-b0ee75561beadc4db4d9a899c8ef4a7db50aa0ab.tar.xz olio-linux-3.10-b0ee75561beadc4db4d9a899c8ef4a7db50aa0ab.zip | |
[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.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/kernel/timer.c b/kernel/timer.c index 5fccc7cbf3b..78d3fa10fcd 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); } |