rcutorture: Add grace period after CPU offline

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Beyond a certain point in the CPU-hotplug offline process, timers get
stranded on the outgoing CPU, and won't fire until that CPU comes back
online, which might well be never.  This commit therefore adds a hook
in torture_onoff_init() that is invoked from torture_offline(), which
rcutorture uses to occasionally wait for a grace period.  This should
result in failures for RCU implementations that rely on stranded timers
eventually firing in the absence of the CPU coming back online.

Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>

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This commit is contained in:

Paul E. McKenney 2018-12-10 09:44:52 -08:00

parent 0d8a9ea976

commit 3a6cb58f15

4 changed files with 18 additions and 4 deletions

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3

include/linux/torture.h

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2

kernel/locking/locktorture.c

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11

kernel/rcu/rcutorture.c

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6

kernel/torture.c

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