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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/mips/sibyte
parenttimekeeping: Update clocksource with stop_machine (diff)
downloadlinux-d4f587c67fc39e0030ddd718675e252e208da4d7.tar.xz
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/mips/sibyte')
-rw-r--r--arch/mips/sibyte/swarm/setup.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/arch/mips/sibyte/swarm/setup.c b/arch/mips/sibyte/swarm/setup.c
index 672e45d495a9..623ffc933c4c 100644
--- a/arch/mips/sibyte/swarm/setup.c
+++ b/arch/mips/sibyte/swarm/setup.c
@@ -87,19 +87,26 @@ enum swarm_rtc_type {
enum swarm_rtc_type swarm_rtc_type;
-unsigned long read_persistent_clock(void)
+void read_persistent_clock(struct timespec *ts)
{
+ unsigned long sec;
+
switch (swarm_rtc_type) {
case RTC_XICOR:
- return xicor_get_time();
+ sec = xicor_get_time();
+ break;
case RTC_M4LT81:
- return m41t81_get_time();
+ sec = m41t81_get_time();
+ break;
case RTC_NONE:
default:
- return mktime(2000, 1, 1, 0, 0, 0);
+ sec = mktime(2000, 1, 1, 0, 0, 0);
+ break;
}
+ ts->tv_sec = sec;
+ tv->tv_nsec = 0;
}
int rtc_mips_set_time(unsigned long sec)