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| author | DengChao <chao.deng@linaro.org> | 2015-12-13 05:24:18 +0100 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2015-12-17 01:50:55 +0100 |
| commit | dee3665416a8553279d10b62b5e62685cbe5daa8 (patch) | |
| tree | dd4a6644f7b8e70467772438d82af56f1ee06c49 | |
| parent | time: Verify time values in adjtimex ADJ_SETOFFSET to avoid overflow (diff) | |
| download | linux-dee3665416a8553279d10b62b5e62685cbe5daa8.tar.xz linux-dee3665416a8553279d10b62b5e62685cbe5daa8.zip | |
timekeeping: Provide internal function __ktime_get_real_seconds
In order to fix Y2038 issues in the ntp code we will need replace
get_seconds() with ktime_get_real_seconds() but as the ntp code uses
the timekeeping lock which is also used by ktime_get_real_seconds(),
we need a version without locking.
Add a new function __ktime_get_real_seconds() in timekeeping to
do this.
Reviewed-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: DengChao <chao.deng@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
| -rw-r--r-- | kernel/time/timekeeping.c | 13 | ||||
| -rw-r--r-- | kernel/time/timekeeping_internal.h | 2 |
2 files changed, 15 insertions, 0 deletions
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index d9249daf14ba..21cc23918cbd 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -845,6 +845,19 @@ time64_t ktime_get_real_seconds(void) } EXPORT_SYMBOL_GPL(ktime_get_real_seconds); +/** + * __ktime_get_real_seconds - The same as ktime_get_real_seconds + * but without the sequence counter protect. This internal function + * is called just when timekeeping lock is already held. + */ +time64_t __ktime_get_real_seconds(void) +{ + struct timekeeper *tk = &tk_core.timekeeper; + + return tk->xtime_sec; +} + + #ifdef CONFIG_NTP_PPS /** diff --git a/kernel/time/timekeeping_internal.h b/kernel/time/timekeeping_internal.h index 4ea005a7f9da..e20466ffc208 100644 --- a/kernel/time/timekeeping_internal.h +++ b/kernel/time/timekeeping_internal.h @@ -26,4 +26,6 @@ static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask) } #endif +extern time64_t __ktime_get_real_seconds(void); + #endif /* _TIMEKEEPING_INTERNAL_H */ |