John Stultz 4eca11dbd2 timekeeping: Avoid taking lock in NMI path with CONFIG_DEBUG_TIMEKEEPING ... commit 27727df240c7cc84f2ba6047c6f18d5addfd25ef upstream. When I added some extra sanity checking in timekeeping_get_ns() under CONFIG_DEBUG_TIMEKEEPING, I missed that the NMI safe __ktime_get_fast_ns() method was using timekeeping_get_ns(). Thus the locking added to the debug checks broke the NMI-safety of __ktime_get_fast_ns(). This patch open-codes the timekeeping_get_ns() logic for __ktime_get_fast_ns(), so can avoid any deadlocks in NMI. Fixes: 4ca22c2648 "timekeeping: Add warnings when overflows or underflows are observed" Reported-by: Steven Rostedt <rostedt@goodmis.org> Reported-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: John Stultz <john.stultz@linaro.org> Link: http://lkml.kernel.org/r/1471993702-29148-2-git-send-email-john.stultz@linaro.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2016-09-15 08:27:52 +02:00
..
alarmtimer.c	alarmtimer: Get rid of unused return value	2015-04-22 17:06:52 +02:00
clockevents.c	clockevents: Remove unused set_mode() callback	2015-09-14 11:00:55 +02:00
clocksource.c	clocksource: Allow unregistering the watchdog	2016-09-15 08:27:47 +02:00
hrtimer.c	hrtimer: Catch illegal clockids	2016-09-15 08:27:44 +02:00
itimer.c	itimers: Handle relative timers with CONFIG_TIME_LOW_RES proper	2016-02-25 12:01:25 -08:00
jiffies.c	tick: Move clocksource related stuff to timekeeping.h	2015-04-01 14:22:58 +02:00
Kconfig	rcu: Drop RCU_USER_QS in favor of NO_HZ_FULL	2015-07-06 13:52:18 -07:00
Makefile	time: Remove development rules from Kbuild/Makefile	2015-07-01 09:57:35 +02:00
ntp.c	ntp: Fix ADJ_SETOFFSET being used w/ ADJ_NANO	2016-09-15 08:27:47 +02:00
ntp_internal.h	ntp/pps: use timespec64 for hardpps()	2015-10-01 09:57:59 -07:00
posix-clock.c	posix-clock: Fix return code on the poll method's error path	2016-03-03 15:07:15 -08:00
posix-cpu-timers.c	posix_cpu_timer: Exit early when process has been reaped	2016-08-10 11:49:29 +02:00
posix-timers.c	posix-timers: Handle relative timers with CONFIG_TIME_LOW_RES proper	2016-02-25 12:01:25 -08:00
sched_clock.c	timers, sched/clock: Clean up the code a bit	2015-03-27 08:34:01 +01:00
test_udelay.c	time: Rename udelay_test.c to test_udelay.c	2014-11-21 11:59:55 -08:00
tick-broadcast-hrtimer.c	kernel: broadcast-hrtimer: Migrate to new 'set-state' interface	2015-08-10 11:41:08 +02:00
tick-broadcast.c	tick: Move the export of tick_broadcast_oneshot_control to the proper place	2015-07-14 12:01:04 +02:00
tick-common.c	clockevents: Remove unused set_mode() callback	2015-09-14 11:00:55 +02:00
tick-internal.h	timer: Minimize nohz off overhead	2015-06-19 15:18:28 +02:00
tick-oneshot.c	clockevents: Provide functions to set and get the state	2015-06-02 14:40:47 +02:00
tick-sched.c	tick/nohz: Set the correct expiry when switching to nohz/lowres mode	2016-03-03 15:07:26 -08:00
tick-sched.h	tick/broadcast: Make idle check independent from mode and config	2015-07-07 18:46:47 +02:00
time.c	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-09-01 14:04:50 -07:00
timeconst.bc	timeconst: Update path in comment	2015-10-26 10:06:06 +09:00
timeconv.c
timecounter.c	timecounter: keep track of accumulated fractional nanoseconds	2014-12-30 18:29:27 -05:00
timekeeping.c	timekeeping: Avoid taking lock in NMI path with CONFIG_DEBUG_TIMEKEEPING	2016-09-15 08:27:52 +02:00
timekeeping.h	hrtimer: Make offset update smarter	2015-04-22 17:06:49 +02:00
timekeeping_debug.c	timekeeping: Cap array access in timekeeping_debug	2016-09-15 08:27:52 +02:00
timekeeping_internal.h	clocksource: Move cycle_last validation to core code	2014-07-23 15:01:51 -07:00
timer.c	timers: Use proper base migration in add_timer_on()	2015-11-04 20:23:19 +01:00
timer_list.c	hrtimer: Handle remaining time proper for TIME_LOW_RES	2016-02-17 12:30:57 -08:00
timer_stats.c	timer: Stats: Simplify the flags handling	2015-06-19 15:18:27 +02:00