timekeeping: update xtime_cache when time(zone) changes

xtime_cache needs to be updated whenever xtime and or wall_to_monotic
are changed. Otherwise users of xtime_cache might see a stale (and in
the case of timezone changes utterly wrong) value until the next
update happens.

Fixup the obvious places, which miss this update.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <johnstul@us.ibm.com>
Tested-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/time.h b/include/linux/time.h
index b04136d60a2f..ceaab9fff155 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -122,6 +122,7 @@ extern void monotonic_to_bootbased(struct timespec *ts);
 extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
 extern int timekeeping_is_continuous(void);
 extern void update_wall_time(void);
+extern void update_xtime_cache(u64 nsec);
 
 /**
  * timespec_to_ns - Convert timespec to nanoseconds