From 88ca472f80604c070526eb58b977ea0a9c3c2e1f Mon Sep 17 00:00:00 2001 From: Zqiang Date: Thu, 24 Mar 2022 19:15:15 +0800 Subject: 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 Signed-off-by: Paul E. McKenney --- kernel/rcu/tree_plugin.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'kernel/rcu/tree_plugin.h') diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 176639c6215f..5c23aceecd62 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -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; } -- cgit