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uml: fix bad NTP interaction with clock

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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>
This commit is contained in:
Jeff Dike 2008-05-12 14:01:53 -07:00 committed by Linus Torvalds
parent 309e96cdf2
commit cfd28f6695
1 changed files with 2 additions and 2 deletions
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4
arch/um/kernel/time.c
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@ -75,7 +75,7 @@ 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 = {
@ -83,7 +83,7 @@ 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,
};