From 3c00a1fe8496ff29ab62764bb3f4ce4b48089004 Mon Sep 17 00:00:00 2001 From: Xunlei Pang Date: Wed, 1 Apr 2015 20:34:23 -0700 Subject: [PATCH] time: Add y2038 safe update_persistent_clock64() 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 Signed-off-by: Xunlei Pang Signed-off-by: John Stultz Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/1427945681-29972-4-git-send-email-john.stultz@linaro.org Signed-off-by: Ingo Molnar --- drivers/rtc/systohc.c | 2 +- include/linux/timekeeping.h | 1 + kernel/time/ntp.c | 13 ++++++++++++- 3 files changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/rtc/systohc.c b/drivers/rtc/systohc.c index eb71872d0361..ef3c07a52c3a 100644 --- a/drivers/rtc/systohc.c +++ b/drivers/rtc/systohc.c @@ -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 diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h index 4c0f76f4616c..7a2369d5b3f4 100644 --- a/include/linux/timekeeping.h +++ b/include/linux/timekeeping.h @@ -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 diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index 9ad60d028508..7a681003001c 100644 --- a/kernel/time/ntp.c +++ b/kernel/time/ntp.c @@ -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); -- GitLab