The patch titled
time: don't touch an offlined CPU's ts->tick_stopped in tick_cancel_sched_timer()
has been added to the -mm tree. Its filename is
time-dont-touch-an-offlined-cpus-ts-tick_stopped-in-tick_cancel_sched_timer.patch
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------------------------------------------------------
Subject: time: don't touch an offlined CPU's ts->tick_stopped in tick_cancel_sched_timer()
From: Karsten Wiese <fzu@xxxxxxxxxxxxxxxxxxxxx>
Silences WARN_ONs in rcu_enter_nohz() and rcu_exit_nohz(), which appeared
before caused by (repeated) calls to:
$ echo 0 > /sys/devices/system/cpu/cpu1/online
$ echo 1 > /sys/devices/system/cpu/cpu1/online
Signed-off-by: Karsten Wiese <fzu@xxxxxxxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Rafael Wysocki <rjw@xxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/time/tick-sched.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/time/tick-sched.c~time-dont-touch-an-offlined-cpus-ts-tick_stopped-in-tick_cancel_sched_timer kernel/time/tick-sched.c
--- a/kernel/time/tick-sched.c~time-dont-touch-an-offlined-cpus-ts-tick_stopped-in-tick_cancel_sched_timer
+++ a/kernel/time/tick-sched.c
@@ -635,7 +635,7 @@ void tick_cancel_sched_timer(int cpu)
if (ts->sched_timer.base)
hrtimer_cancel(&ts->sched_timer);
- ts->tick_stopped = 0;
+
ts->nohz_mode = NOHZ_MODE_INACTIVE;
}
#endif /* HIGH_RES_TIMERS */
_
Patches currently in -mm which might be from fzu@xxxxxxxxxxxxxxxxxxxxx are
time-dont-touch-an-offlined-cpus-ts-tick_stopped-in-tick_cancel_sched_timer.patch
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