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rcutorture: Add fqs_holdoff check before fqs_task is created 

For rcutorture tests on RCU implementations that support
force-quiescent-state operations and that set the fqs_duration module
parameter greater than zero, the fqs_task kthread will be created.
However, if the fqs_holdoff module parameter is not set, then its default
value of zero will cause fqs_task enter a long-term busy loop until
stopped by kthread_stop().  This commit therefore adds a fqs_holdoff
check before the fqs_task is created, making sure that whenever the
fqs_task is created, the fqs_holdoff will be greater than zero.

Signed-off-by: Zqiang <qiang.zhang1211@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.iitr10@gmail.com>
This commit is contained in:
Zqiang 2023-11-03 15:26:39 +08:00 committed by Neeraj Upadhyay (AMD)
parent af19a2526c
commit 90f1015dfe
1 changed files with 3 additions and 1 deletions
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4
kernel/rcu/rcutorture.c
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@ -3872,7 +3872,9 @@ rcu_torture_init(void)
}
if (fqs_duration < 0)
fqs_duration = 0;
if (fqs_duration) {
if (fqs_holdoff < 0)
fqs_holdoff = 0;
if (fqs_duration && fqs_holdoff) {
/* Create the fqs thread */
firsterr = torture_create_kthread(rcu_torture_fqs, NULL,
fqs_task);