Messages in this thread Patch in this message | | | Date | Tue, 5 Aug 2008 16:14:03 -0400 | From | Jeff Dike <> | Subject | [PATCH 2/14] uml: fix bad NTP interaction with clock |
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From cfd28f6695d0fc047478480791a21bdd4967f98e
UML's supposed nanosecond clock interacts badly with NTP when NTP decides that the clock has drifted ahead and needs to be slowed down. Slowing down the clock is done by decrementing the cycle-to-nanosecond multiplier, which is 1. Decrementing that gives you 0 and time is stopped.
This is fixed by switching to a microsecond clock, with a multiplier of 1000.
Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> --- arch/um/kernel/time.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c index e066e84..5036c81 100644 --- a/arch/um/kernel/time.c +++ b/arch/um/kernel/time.c @@ -74,7 +74,7 @@ static irqreturn_t um_timer(int irq, void *dev) static cycle_t itimer_read(void) { - return os_nsecs(); + return os_nsecs() / 1000; } static struct clocksource itimer_clocksource = { @@ -82,7 +82,7 @@ static struct clocksource itimer_clocksource = { .rating = 300, .read = itimer_read, .mask = CLOCKSOURCE_MASK(64), - .mult = 1, + .mult = 1000, .shift = 0, .flags = CLOCK_SOURCE_IS_CONTINUOUS, }; -- 1.5.5.1
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