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Ahmed S. Darwish 2902207377 time/sched_clock: Expire timer in hardirq context 
[ Upstream commit 2c8bd58812 ]

To minimize latency, PREEMPT_RT kernels expires hrtimers in preemptible
softirq context by default. This can be overriden by marking the timer's
expiry with HRTIMER_MODE_HARD.

sched_clock_timer is missing this annotation: if its callback is preempted
and the duration of the preemption exceeds the wrap around time of the
underlying clocksource, sched clock will get out of sync.

Mark the sched_clock_timer for expiry in hard interrupt context.

Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200309181529.26558-1-a.darwish@linutronix.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-04-17 10:50:02 +02:00
..
alarmtimer.c alarmtimer: Make alarmtimer platform device child of RTC device 2020-02-24 08:36:57 +01:00
clockevents.c tick: Remove outgoing CPU from broadcast masks 2019-03-23 18:26:43 +01:00
clocksource.c clocksource: Prevent double add_timer_on() for watchdog_timer 2020-02-11 04:35:54 -08:00
hrtimer.c hrtimer: Annotate lockless access to timer->state 2020-01-04 19:18:41 +01:00
itimer.c posix-cpu-timers: Switch thread group sampling to array 2019-08-28 11:50:39 +02:00
jiffies.c Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-05-06 14:50:46 -07:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile timekeeping: Provide a generic update_vsyscall() implementation 2019-06-22 21:21:06 +02:00
ntp.c ntp/y2038: Remove incorrect time_t truncation 2019-11-12 08:13:44 +01:00
ntp_internal.h ntp: Audit NTP parameters adjustment 2019-04-15 18:14:01 -04:00
posix-clock.c ptp: fix the race between the release of ptp_clock and cdev 2020-01-04 19:18:48 +01:00
posix-cpu-timers.c posix-cpu-timers: Fix two trivial comments 2019-10-23 14:48:24 +02:00
posix-stubs.c y2038: syscalls: rename y2038 compat syscalls 2019-02-07 00:13:27 +01:00
posix-timers.c hrtimer: Improve comments on handling priority inversion against softirq kthread 2019-08-20 22:05:46 +02:00
posix-timers.h posix-timers: Use a callback for cancel synchronization on PREEMPT_RT 2019-08-20 22:05:46 +02:00
sched_clock.c time/sched_clock: Expire timer in hardirq context 2020-04-17 10:50:02 +02:00
test_udelay.c time/debug: Remove license boilerplate 2018-11-23 11:51:21 +01:00
tick-broadcast-hrtimer.c tick: broadcast-hrtimer: Fix a race in bc_set_next 2019-09-27 14:45:55 +02:00
tick-broadcast.c tick: Fix typos in comments 2019-04-19 19:17:04 +02:00
tick-common.c Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-05-06 14:50:46 -07:00
tick-internal.h tick: Remove outgoing CPU from broadcast masks 2019-03-23 18:26:43 +01:00
tick-oneshot.c hrtimers/tick/clockevents: Remove sloppy license references 2018-11-23 11:51:21 +01:00
tick-sched.c tick/sched: Annotate lockless access to last_jiffies_update 2020-01-23 08:22:55 +01:00
tick-sched.h tick/sched: Update tick_sched struct documentation 2019-03-24 20:29:32 +01:00
time.c time: Zero the upper 32-bits in __kernel_timespec on 32-bit 2019-12-13 08:42:18 +01:00
timeconst.bc time: Add SPDX license identifiers 2018-11-23 11:51:20 +01:00
timeconv.c time: Add SPDX license identifiers 2018-11-23 11:51:20 +01:00
timecounter.c time: Remove license boilerplate 2018-11-23 11:51:21 +01:00
timekeeping.c timekeeping/vsyscall: Prevent math overflow in BOOTTIME update 2019-08-23 02:12:11 +02:00
timekeeping.h timers/sched_clock: Prevent generic sched_clock wrap caused by tick_freeze() 2019-04-18 14:34:53 +02:00
timekeeping_debug.c timekeeping/debug: No need to check return value of debugfs_create functions 2019-01-29 20:08:41 +01:00
timekeeping_internal.h timekeeping/ntp: Constify some function arguments 2018-07-19 17:08:05 -07:00
timer.c timer: Read jiffies once when forwarding base clk 2019-09-19 17:50:11 +02:00
timer_list.c timer_list: Guard procfs specific code 2019-06-23 00:08:52 +02:00
vsyscall.c lib/vdso: Update coarse timekeeper unconditionally 2020-03-05 16:43:49 +01:00