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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-08-14 15:47:31 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2009-08-15 10:55:46 +0200 |
| commit | d4f587c67fc39e0030ddd718675e252e208da4d7 (patch) | |
| tree | 2222681c57966cc6b8404afdff3ab1a09ac7ea69 /arch/x86/kernel/rtc.c | |
| parent | 75c5158f70c065b9704b924503d96e8297838f79 (diff) | |
| download | linux-d4f587c67fc39e0030ddd718675e252e208da4d7.tar.gz linux-d4f587c67fc39e0030ddd718675e252e208da4d7.tar.bz2 linux-d4f587c67fc39e0030ddd718675e252e208da4d7.zip | |
timekeeping: Increase granularity of read_persistent_clock()
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>
Diffstat (limited to 'arch/x86/kernel/rtc.c')
| -rw-r--r-- | arch/x86/kernel/rtc.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/kernel/rtc.c b/arch/x86/kernel/rtc.c index 5d465b207e72..bf67dcb4a44c 100644 --- a/arch/x86/kernel/rtc.c +++ b/arch/x86/kernel/rtc.c @@ -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) |