diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2008-02-01 17:45:13 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-02-01 17:45:13 +0100 |
| commit | 1001d0a9ee74a468077dfd4da0565174e88de26b (patch) | |
| tree | 8775592b23e8049700ff98a7bdbcf9c802a0f127 | |
| parent | hrtimer: fix hrtimer_init_sleeper() users (diff) | |
| download | linux-1001d0a9ee74a468077dfd4da0565174e88de26b.tar.xz linux-1001d0a9ee74a468077dfd4da0565174e88de26b.zip | |
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>
| -rw-r--r-- | include/linux/time.h | 1 | ||||
| -rw-r--r-- | kernel/time.c | 1 | ||||
| -rw-r--r-- | kernel/time/timekeeping.c | 6 |
3 files changed, 6 insertions, 2 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 diff --git a/kernel/time.c b/kernel/time.c index 09d3c45c4da7..4064c0566e77 100644 --- a/kernel/time.c +++ b/kernel/time.c @@ -129,6 +129,7 @@ static inline void warp_clock(void) write_seqlock_irq(&xtime_lock); wall_to_monotonic.tv_sec -= sys_tz.tz_minuteswest * 60; xtime.tv_sec += sys_tz.tz_minuteswest * 60; + update_xtime_cache(0); write_sequnlock_irq(&xtime_lock); clock_was_set(); } diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index 092a2366b5a9..cd5dbc4579c9 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -47,7 +47,7 @@ struct timespec wall_to_monotonic __attribute__ ((aligned (16))); static unsigned long total_sleep_time; /* seconds */ static struct timespec xtime_cache __attribute__ ((aligned (16))); -static inline void update_xtime_cache(u64 nsec) +void update_xtime_cache(u64 nsec) { xtime_cache = xtime; timespec_add_ns(&xtime_cache, nsec); @@ -145,6 +145,7 @@ int do_settimeofday(struct timespec *tv) set_normalized_timespec(&xtime, sec, nsec); set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec); + update_xtime_cache(0); clock->error = 0; ntp_clear(); @@ -252,8 +253,8 @@ void __init timekeeping_init(void) xtime.tv_nsec = 0; set_normalized_timespec(&wall_to_monotonic, -xtime.tv_sec, -xtime.tv_nsec); + update_xtime_cache(0); total_sleep_time = 0; - write_sequnlock_irqrestore(&xtime_lock, flags); } @@ -290,6 +291,7 @@ static int timekeeping_resume(struct sys_device *dev) } /* Make sure that we have the correct xtime reference */ timespec_add_ns(&xtime, timekeeping_suspend_nsecs); + update_xtime_cache(0); /* re-base the last cycle value */ clock->cycle_last = clocksource_read(clock); clock->error = 0; |