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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2009-08-14 15:47:31 +0200
committerThomas Gleixner <tglx@linutronix.de>2009-08-15 10:55:46 +0200
commitd4f587c67fc39e0030ddd718675e252e208da4d7 (patch)
tree2222681c57966cc6b8404afdff3ab1a09ac7ea69 /arch/powerpc
parent75c5158f70c065b9704b924503d96e8297838f79 (diff)
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/powerpc')
-rw-r--r--arch/powerpc/kernel/time.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index eae4511ceea..ad63f30fe3d 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -769,7 +769,7 @@ int update_persistent_clock(struct timespec now)
return ppc_md.set_rtc_time(&tm);
}
-unsigned long read_persistent_clock(void)
+void read_persistent_clock(struct timespec *ts)
{
struct rtc_time tm;
static int first = 1;
@@ -787,8 +787,9 @@ unsigned long read_persistent_clock(void)
if (!ppc_md.get_rtc_time)
return 0;
ppc_md.get_rtc_time(&tm);
- return mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday,
- tm.tm_hour, tm.tm_min, tm.tm_sec);
+ ts->tv_sec = mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday,
+ tm.tm_hour, tm.tm_min, tm.tm_sec);
+ ts->tv_nsec = 0;
}
/* clocksource code */