Chris Metcalf 46c8f0b077 timers: Fix get_next_timer_interrupt() computation ... The tick_nohz_stop_sched_tick() routine is not properly canceling the sched timer when nothing is pending, because get_next_timer_interrupt() is no longer returning KTIME_MAX in that case. This causes periodic interrupts when none are needed. When determining the next interrupt time, we first use __next_timer_interrupt() to get the first expiring timer in the timer wheel. If no timer is found, we return the base clock value plus NEXT_TIMER_MAX_DELTA to indicate there is no timer in the timer wheel. Back in get_next_timer_interrupt(), we set the "expires" value by converting the timer wheel expiry (in ticks) to a nsec value. But we don't want to do this if the timer wheel expiry value indicates no timer; we want to return KTIME_MAX. Prior to commit 500462a9de ("timers: Switch to a non-cascading wheel") we checked base->active_timers to see if any timers were active, and if not, we didn't touch the expiry value and so properly returned KTIME_MAX. Now we don't have active_timers. To fix this, we now just check the timer wheel expiry value to see if it is "now + NEXT_TIMER_MAX_DELTA", and if it is, we don't try to compute a new value based on it, but instead simply let the KTIME_MAX value in expires remain. Fixes: 500462a9de "timers: Switch to a non-cascading wheel" Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Christoph Lameter <cl@linux.com> Cc: John Stultz <john.stultz@linaro.org> Link: http://lkml.kernel.org/r/1470688147-22287-1-git-send-email-cmetcalf@mellanox.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		2016-08-09 09:31:55 +02:00
..
alarmtimer.c	alarmtimer: Fix comments describing structure fields	2016-06-20 12:47:09 -07:00
clockevents.c	clockevents: Make clockevents_subsys static	2016-07-19 10:48:06 +02:00
clocksource.c	clocksource: Make clocksource insert entry more efficient	2016-06-20 12:46:34 -07:00
hrtimer.c	hrtimer: Convert to hotplug state machine	2016-07-15 10:41:37 +02:00
itimer.c	itimers: Handle relative timers with CONFIG_TIME_LOW_RES proper	2016-01-17 11:13:55 +01:00
jiffies.c	jiffies: Use CLOCKSOURCE_MASK instead of constant	2016-02-27 08:55:31 +01:00
Kconfig
Makefile
ntp_internal.h	ntp: Fix second_overflow's input parameter type to be 64bits	2015-12-16 16:50:56 -08:00
ntp.c	ntp: Fix ADJ_SETOFFSET being used w/ ADJ_NANO	2016-01-22 12:01:42 +01:00
posix-clock.c	posix-clock: Fix return code on the poll method's error path	2015-12-29 11:33:06 +01:00
posix-cpu-timers.c	posix_cpu_timer: Exit early when process has been reaped	2016-07-11 17:20:12 +02:00
posix-timers.c	posix-timers: Handle relative timers with CONFIG_TIME_LOW_RES proper	2016-01-17 11:13:55 +01:00
sched_clock.c
test_udelay.c	time: Avoid timespec in udelay_test	2016-06-20 12:47:26 -07:00
tick-broadcast-hrtimer.c	tick/broadcast-hrtimer: Set name of the ce_broadcast_hrtimer	2016-07-05 17:02:19 +02:00
tick-broadcast.c
tick-common.c
tick-internal.h	timers: Forward the wheel clock whenever possible	2016-07-07 10:35:11 +02:00
tick-oneshot.c
tick-sched.c	tick/nohz: Optimize nohz idle enter	2016-07-19 13:48:24 +02:00
tick-sched.h	timers/nohz: Convert tick dependency mask to atomic_t	2016-03-29 11:52:11 +02:00
time.c	time: remove timespec_add_safe()	2016-05-19 19:12:14 -07:00
timeconst.bc
timeconv.c	time: Add time64_to_tm()	2016-06-20 12:47:15 -07:00
timecounter.c
timekeeping_debug.c
timekeeping_internal.h	clocksource: Make clocksource validation work for all clocksources	2015-12-19 15:59:57 +01:00
timekeeping.c	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-07-25 20:43:12 -07:00
timekeeping.h
timer_list.c	hrtimer: Handle remaining time proper for TIME_LOW_RES	2016-01-17 11:13:55 +01:00
timer_stats.c	timer: Avoid using timespec	2016-06-20 12:47:33 -07:00
timer.c	timers: Fix get_next_timer_interrupt() computation	2016-08-09 09:31:55 +02:00