Paul Gortmaker 28956e530b tick/nohz: Use WARN_ON_ONCE() to prevent console saturation ...

commit 40e97e4296 upstream.

While running some testing on code that happened to allow the variable
tick_nohz_full_running to get set but with no "possible" NOHZ cores to
back up that setting, this warning triggered:

        if (unlikely(tick_do_timer_cpu == TICK_DO_TIMER_NONE))
                WARN_ON(tick_nohz_full_running);

The console was overwhemled with an endless stream of one WARN per tick
per core and there was no way to even see what was going on w/o using a
serial console to capture it and then trace it back to this.

Change it to WARN_ON_ONCE().

Fixes: 08ae95f4fd ("nohz_full: Allow the boot CPU to be nohz_full")
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20211206145950.10927-3-paul.gortmaker@windriver.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2022-04-20 09:19:39 +02:00

..

alarmtimer.c

kernel, fs: Introduce and use set_restart_fn() and arch_set_restart_data()

2021-03-24 11:26:44 +01:00

clockevents.c

tick: Remove outgoing CPU from broadcast masks

2019-03-23 18:26:43 +01:00

clocksource.c

clocksource: Retry clock read if long delays detected

2021-07-14 16:53:18 +02:00

hrtimer.c

hrtimer: Ensure timerfd notification for HIGHRES=n

2021-09-15 09:47:26 +02:00

itimer.c

time: Prevent undefined behaviour in timespec64_to_ns()

2020-11-18 19:20:15 +01:00

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_internal.h

ntp: Audit NTP parameters adjustment

2019-04-15 18:14:01 -04:00

ntp.c

ntp/y2038: Remove incorrect time_t truncation

2019-11-12 08:13:44 +01:00

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

Revert "posix-cpu-timers: Force next expiration recalc after itimer reset"

2021-09-16 12:56:13 +02:00

posix-stubs.c

y2038: syscalls: rename y2038 compat syscalls

2019-02-07 00:13:27 +01:00

posix-timers.c

posix-timers: Preserve return value in clock_adjtime32()

2021-05-11 14:04:04 +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

tick/common: Touch watchdog in tick_unfreeze() on all CPUs

2020-11-18 19:20:26 +01:00

tick-internal.h

hrtimer: Ensure timerfd notification for HIGHRES=n

2021-09-15 09:47:26 +02:00

tick-oneshot.c

hrtimers/tick/clockevents: Remove sloppy license references

2018-11-23 11:51:21 +01:00

tick-sched.c

tick/nohz: Use WARN_ON_ONCE() to prevent console saturation

2022-04-20 09:19:39 +02:00

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_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

timekeeping.c

timekeeping: Really make sure wall_to_monotonic isn't positive

2021-12-22 09:29:39 +01:00

timekeeping.h

timers/sched_clock: Prevent generic sched_clock wrap caused by tick_freeze()

2019-04-18 14:34:53 +02:00

timer_list.c

timer_list: Guard procfs specific code

2019-06-23 00:08:52 +02:00

timer.c

timers: Move clearing of base::timer_running under base:: Lock

2021-08-12 13:21:03 +02:00

vsyscall.c

lib/vdso: Update coarse timekeeper unconditionally

2020-03-05 16:43:49 +01:00