Zoran Markovic 0d6bd9953f timekeeping: Correct run-time detection of persistent_clock. ... Since commit 31ade30692, timekeeping_init() checks for presence of persistent clock by attempting to read a non-zero time value. This is an issue on platforms where persistent_clock (instead is implemented as a free-running counter (instead of an RTC) starting from zero on each boot and running during suspend. Examples are some ARM platforms (e.g. PandaBoard). An attempt to read such a clock during timekeeping_init() may return zero value and falsely declare persistent clock as missing. Additionally, in the above case suspend times may be accounted twice (once from timekeeping_resume() and once from rtc_resume()), resulting in a gradual drift of system time. This patch does a run-time correction of the issue by doing the same check during timekeeping_suspend(). A better long-term solution would have to return error when trying to read non-existing clock and zero when trying to read an uninitialized clock, but that would require changing all persistent_clock implementations. This patch addresses the immediate breakage, for now. Cc: John Stultz <john.stultz@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Feng Tang <feng.tang@intel.com> Cc: stable@vger.kernel.org Signed-off-by: Zoran Markovic <zoran.markovic@linaro.org> [jstultz: Tweaked commit message and subject] Signed-off-by: John Stultz <john.stultz@linaro.org>		2013-05-28 13:45:19 -07:00
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alarmtimer.c
clockevents.c	clockevents: export clockevents_config_and_register for module use	2013-01-14 10:12:37 -08:00
clocksource.c
jiffies.c	time: Kill xtime_lock, replacing it with jiffies_lock	2012-11-13 14:08:23 -05:00
Kconfig	Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-05-15 14:05:17 -07:00
Makefile	time: remove the timecompare code.	2012-11-01 11:41:35 -04:00
ntp_internal.h	ntp: Rework do_adjtimex to take timespec and tai arguments	2013-04-04 13:18:15 -07:00
ntp.c	ntp: Remove unused variable flags in __hardpps	2013-05-28 13:45:19 -07:00
posix-clock.c
tick-broadcast.c	Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-05-15 14:05:17 -07:00
tick-common.c	Merge branch 'timers-nohz-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-05-05 13:23:27 -07:00
tick-internal.h	Merge branch 'fortglx/3.10/time' of git://git.linaro.org/people/jstultz/linux into timers/core	2013-04-03 12:27:29 +02:00
tick-oneshot.c
tick-sched.c	Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-05-15 14:05:17 -07:00
timeconv.c
timekeeping.c	timekeeping: Correct run-time detection of persistent_clock.	2013-05-28 13:45:19 -07:00
timer_list.c	timer_list: Convert timer list to be a proper seq_file	2013-04-17 20:51:02 +02:00
timer_stats.c