linux/kernel/time
John Stultz b4f711ee03 time: Revert ALWAYS_USE_PERSISTENT_CLOCK compile time optimizaitons
Kay Sievers noted that the ALWAYS_USE_PERSISTENT_CLOCK config,
which enables some minor compile time optimization to avoid
uncessary code in mostly the suspend/resume path could cause
problems for userland.

In particular, the dependency for RTC_HCTOSYS on
!ALWAYS_USE_PERSISTENT_CLOCK, which avoids setting the time
twice and simplifies suspend/resume, has the side effect
of causing the /sys/class/rtc/rtcN/hctosys flag to always be
zero, and this flag is commonly used by udev to setup the
/dev/rtc symlink to /dev/rtcN, which can cause pain for
older applications.

While the udev rules could use some work to be less fragile,
breaking userland should strongly be avoided. Additionally
the compile time optimizations are fairly minor, and the code
being optimized is likely to be reworked in the future, so
lets revert this change.

Reported-by: Kay Sievers <kay@vrfy.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Cc: stable <stable@vger.kernel.org> #3.9
Cc: Feng Tang <feng.tang@intel.com>
Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Link: http://lkml.kernel.org/r/1366828376-18124-1-git-send-email-john.stultz@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-14 20:54:06 +02:00
..
alarmtimer.c alarmtimer: Rename alarmtimer_remove to alarmtimer_dequeue 2012-09-24 12:38:03 -04:00
clockevents.c clockevents: export clockevents_config_and_register for module use 2013-01-14 10:12:37 -08:00
clocksource.c kernel-time: fix s/then/than/ spelling errors 2012-03-23 16:49:21 -07:00
jiffies.c time: Kill xtime_lock, replacing it with jiffies_lock 2012-11-13 14:08:23 -05:00
Kconfig time: Revert ALWAYS_USE_PERSISTENT_CLOCK compile time optimizaitons 2013-05-14 20:54:06 +02:00
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 ntp_lock, using the timekeeping locks to protect ntp state 2013-04-04 13:18:17 -07:00
posix-clock.c kernel: Fix files explicitly needing EXPORT_SYMBOL infrastructure 2011-10-31 19:30:05 -04:00
tick-broadcast.c tick: Use zalloc_cpumask_var for allocating offstack cpumasks 2013-05-05 11:12:19 +02:00
tick-common.c clockevents: Set dummy handler on CPU_DEAD shutdown 2013-04-25 13:57:04 +02:00
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 clockevents: Make minimum delay adjustments configurable 2011-09-08 11:10:56 +02:00
tick-sched.c tick: Don't invoke tick_nohz_stop_sched_tick() if the cpu is offline 2013-05-14 17:40:31 +02:00
timeconv.c time: add function to convert between calendar time and broken-down time for universal use 2009-09-24 07:20:56 -07:00
timekeeping.c timekeeping: Update tk->cycle_last in resume 2013-04-22 20:17:51 +02:00
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 locking, timer_stats: Annotate table_lock as raw 2011-09-13 11:12:00 +02:00