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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/mips/sni/time.c
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@ -182,7 +182,8 @@ void __init plat_time_init(void)
setup_pit_timer();
}
unsigned long read_persistent_clock(void)
void read_persistent_clock(struct timespec *ts)
{
return -1;
ts->tv_sec = -1;
ts->tv_nsec = 0;
}