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rcu: Check for successful spawn of ->boost_kthread_task 

For the spawning of the priority-boost kthreads can fail, improbable
though this might seem.  This commit therefore refrains from attemoting
to initiate RCU priority boosting when The ->boost_kthread_task pointer
is NULL.

Signed-off-by: Zqiang <qiang1.zhang@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Zqiang 2022-03-24 19:15:15 +08:00 committed by Paul E. McKenney
parent 70ae7b0ce0
commit 88ca472f80
1 changed files with 2 additions and 1 deletions
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3
kernel/rcu/tree_plugin.h
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@ -1125,7 +1125,8 @@ static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags)
__releases(rnp->lock)
{
raw_lockdep_assert_held_rcu_node(rnp);
if (!rcu_preempt_blocked_readers_cgp(rnp) && rnp->exp_tasks == NULL) {
if (!rnp->boost_kthread_task ||
(!rcu_preempt_blocked_readers_cgp(rnp) && !rnp->exp_tasks)) {
raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
return;
}