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time: Add y2038 safe update_persistent_clock64()

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As part of addressing in-kernel y2038 issues, this patch adds
update_persistent_clock64() and replaces all the call sites of
update_persistent_clock() with this function. This is a __weak
implementation, which simply calls the existing y2038 unsafe
update_persistent_clock().

This allows architecture specific implementations to be
converted independently, and eventually y2038-unsafe
update_persistent_clock() can be removed after all its
architecture specific implementations have been converted to
update_persistent_clock64().

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Xunlei Pang <pang.xunlei@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1427945681-29972-4-git-send-email-john.stultz@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Xunlei Pang 2015-04-01 20:34:23 -07:00 committed by Ingo Molnar
parent 2ee9663200
commit 3c00a1fe84
3 changed files with 14 additions and 2 deletions
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2
drivers/rtc/systohc.c
View file

@ -11,7 +11,7 @@
* rtc_set_ntp_time - Save NTP synchronized time to the RTC
* @now: Current time of day
*
* Replacement for the NTP platform function update_persistent_clock
* Replacement for the NTP platform function update_persistent_clock64
* that stores time for later retrieval by rtc_hctosys.
*
* Returns 0 on successful RTC update, -ENODEV if a RTC update is not

1
include/linux/timekeeping.h
View file

@ -272,6 +272,7 @@ extern void read_persistent_clock64(struct timespec64 *ts);
extern void read_boot_clock(struct timespec *ts);
extern void read_boot_clock64(struct timespec64 *ts);
extern int update_persistent_clock(struct timespec now);
extern int update_persistent_clock64(struct timespec64 now);
#endif

13
kernel/time/ntp.c
View file

@ -458,6 +458,16 @@ int second_overflow(unsigned long secs)
return leap;
}
#ifdef CONFIG_GENERIC_CMOS_UPDATE
int __weak update_persistent_clock64(struct timespec64 now64)
{
struct timespec now;
now = timespec64_to_timespec(now64);
return update_persistent_clock(now);
}
#endif
#if defined(CONFIG_GENERIC_CMOS_UPDATE) || defined(CONFIG_RTC_SYSTOHC)
static void sync_cmos_clock(struct work_struct *work);
@ -493,8 +503,9 @@ static void sync_cmos_clock(struct work_struct *work)
if (persistent_clock_is_local)
adjust.tv_sec -= (sys_tz.tz_minuteswest * 60);
#ifdef CONFIG_GENERIC_CMOS_UPDATE
fail = update_persistent_clock(timespec64_to_timespec(adjust));
fail = update_persistent_clock64(adjust);
#endif
#ifdef CONFIG_RTC_SYSTOHC
if (fail == -ENODEV)
fail = rtc_set_ntp_time(adjust);