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timekeeping: Increase granularity of read_persistent_clock()

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The persistent clock of some architectures (e.g. s390) have a
better granularity than seconds. To reduce the delta between the
host clock and the guest clock in a virtualized system change the 
read_persistent_clock function to return a struct timespec.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: John Stultz <johnstul@us.ibm.com>
Cc: Daniel Walker <dwalker@fifo99.com>
LKML-Reference: <20090814134811.013873340@de.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Martin Schwidefsky
2009-08-14 15:47:31 +02:00
committed by Thomas Gleixner
parent 75c5158f70
commit d4f587c67f
16 changed files with 83 additions and 74 deletions
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5
arch/x86/kernel/rtc.c
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@@ -178,7 +178,7 @@ static int set_rtc_mmss(unsigned long nowtime)
}
/* not static: needed by APM */
unsigned long read_persistent_clock(void)
void read_persistent_clock(struct timespec *ts)
{
unsigned long retval, flags;
@@ -186,7 +186,8 @@ unsigned long read_persistent_clock(void)
retval = get_wallclock();
spin_unlock_irqrestore(&rtc_lock, flags);
return retval;
ts->tv_sec = retval;
ts->tv_nsec = 0;
}
int update_persistent_clock(struct timespec now)