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| author | pang.xunlei <pang.xunlei@linaro.org> | 2014-11-18 19:15:16 +0800 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2014-11-21 11:59:57 -0800 |
| commit | 21f7eca555ad14e7c7b2cb59a6c6252e74ee5c8b (patch) | |
| tree | 1d3beb73efb551aa006118bcf753b1df187ce72c /kernel/time | |
| parent | 659bc17b80c692e0ccda757e207fc4666d9b3e71 (diff) | |
| download | linux-stable-21f7eca555ad14e7c7b2cb59a6c6252e74ee5c8b.tar.gz linux-stable-21f7eca555ad14e7c7b2cb59a6c6252e74ee5c8b.tar.bz2 linux-stable-21f7eca555ad14e7c7b2cb59a6c6252e74ee5c8b.zip | |
time: Provide y2038 safe do_settimeofday() replacement
The kernel uses 32-bit signed value(time_t) for seconds elapsed
1970-01-01:00:00:00, thus it will overflow at 2038-01-19 03:14:08
on 32-bit systems. This is widely known as the y2038 problem.
As part of addressing "y2038 problem" for in-kernel uses, this patch
adds safe do_settimeofday64() using timespec64.
After this patch, do_settimeofday() is deprecated and all its call
sites will be fixed using do_settimeofday64(), after that it can be
removed.
Signed-off-by: pang.xunlei <pang.xunlei@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/timekeeping.c | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index 41fcbe19ccfe..10140dae71c6 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -703,18 +703,18 @@ void do_gettimeofday(struct timeval *tv) EXPORT_SYMBOL(do_gettimeofday); /** - * do_settimeofday - Sets the time of day - * @tv: pointer to the timespec variable containing the new time + * do_settimeofday64 - Sets the time of day. + * @ts: pointer to the timespec64 variable containing the new time * * Sets the time of day to the new time and update NTP and notify hrtimers */ -int do_settimeofday(const struct timespec *tv) +int do_settimeofday64(const struct timespec64 *ts) { struct timekeeper *tk = &tk_core.timekeeper; - struct timespec64 ts_delta, xt, tmp; + struct timespec64 ts_delta, xt; unsigned long flags; - if (!timespec_valid_strict(tv)) + if (!timespec64_valid_strict(ts)) return -EINVAL; raw_spin_lock_irqsave(&timekeeper_lock, flags); @@ -723,13 +723,12 @@ int do_settimeofday(const struct timespec *tv) timekeeping_forward_now(tk); xt = tk_xtime(tk); - ts_delta.tv_sec = tv->tv_sec - xt.tv_sec; - ts_delta.tv_nsec = tv->tv_nsec - xt.tv_nsec; + ts_delta.tv_sec = ts->tv_sec - xt.tv_sec; + ts_delta.tv_nsec = ts->tv_nsec - xt.tv_nsec; tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, ts_delta)); - tmp = timespec_to_timespec64(*tv); - tk_set_xtime(tk, &tmp); + tk_set_xtime(tk, ts); timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); @@ -741,7 +740,7 @@ int do_settimeofday(const struct timespec *tv) return 0; } -EXPORT_SYMBOL(do_settimeofday); +EXPORT_SYMBOL(do_settimeofday64); /** * timekeeping_inject_offset - Adds or subtracts from the current time. |