diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 4b59ef1cbc8b..f6f23a16bd64 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -2079,6 +2079,7 @@ static int rcu_nocb_gp_kthread(void *arg) */ static void nocb_cb_wait(struct rcu_data *rdp) { + unsigned long cur_gp_seq; unsigned long flags; bool needwake_gp = false; struct rcu_node *rnp = rdp->mynode; @@ -2091,7 +2092,9 @@ static void nocb_cb_wait(struct rcu_data *rdp) local_bh_enable(); lockdep_assert_irqs_enabled(); rcu_nocb_lock_irqsave(rdp, flags); - if (raw_spin_trylock_rcu_node(rnp)) { /* irqs already disabled. */ + if (rcu_segcblist_nextgp(&rdp->cblist, &cur_gp_seq) && + rcu_seq_done(&rnp->gp_seq, cur_gp_seq) && + raw_spin_trylock_rcu_node(rnp)) { /* irqs already disabled. */ needwake_gp = rcu_advance_cbs(rdp->mynode, rdp); raw_spin_unlock_rcu_node(rnp); /* irqs remain disabled. */ }