diff options
| -rw-r--r-- | kernel/rcu/tree.c | 2 | ||||
| -rw-r--r-- | kernel/rcu/tree.h | 2 | ||||
| -rw-r--r-- | kernel/rcu/tree_plugin.h | 29 |
3 files changed, 9 insertions, 24 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 2532e584e95f..00a3ebca70b8 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -4166,7 +4166,7 @@ int rcutree_prepare_cpu(unsigned int cpu) rdp->rcu_iw_gp_seq = rdp->gp_seq - 1; trace_rcu_grace_period(rcu_state.name, rdp->gp_seq, TPS("cpuonl")); raw_spin_unlock_irqrestore_rcu_node(rnp, flags); - rcu_prepare_kthreads(cpu); + rcu_spawn_one_boost_kthread(rnp); rcu_spawn_cpu_nocb_kthread(cpu); WRITE_ONCE(rcu_state.n_online_cpus, rcu_state.n_online_cpus + 1); diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index 5fd0c443517e..b5508f44ff29 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -418,8 +418,8 @@ static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags); static void rcu_preempt_boost_start_gp(struct rcu_node *rnp); static bool rcu_is_callbacks_kthread(void); static void rcu_cpu_kthread_setup(unsigned int cpu); +static void rcu_spawn_one_boost_kthread(struct rcu_node *rnp); static void __init rcu_spawn_boost_kthreads(void); -static void rcu_prepare_kthreads(int cpu); static void rcu_cleanup_after_idle(void); static void rcu_prepare_for_idle(void); static bool rcu_preempt_has_tasks(struct rcu_node *rnp); diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index ef004cc7101d..3c90dad00d3c 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -1198,22 +1198,16 @@ static void rcu_preempt_boost_start_gp(struct rcu_node *rnp) */ static void rcu_spawn_one_boost_kthread(struct rcu_node *rnp) { - int rnp_index = rnp - rcu_get_root(); unsigned long flags; + int rnp_index = rnp - rcu_get_root(); struct sched_param sp; struct task_struct *t; - if (!IS_ENABLED(CONFIG_PREEMPT_RCU)) - return; - - if (!rcu_scheduler_fully_active || rcu_rnp_online_cpus(rnp) == 0) + if (rnp->boost_kthread_task || !rcu_scheduler_fully_active) return; rcu_state.boost = 1; - if (rnp->boost_kthread_task != NULL) - return; - t = kthread_create(rcu_boost_kthread, (void *)rnp, "rcub/%d", rnp_index); if (WARN_ON_ONCE(IS_ERR(t))) @@ -1265,17 +1259,8 @@ static void __init rcu_spawn_boost_kthreads(void) struct rcu_node *rnp; rcu_for_each_leaf_node(rnp) - rcu_spawn_one_boost_kthread(rnp); -} - -static void rcu_prepare_kthreads(int cpu) -{ - struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu); - struct rcu_node *rnp = rdp->mynode; - - /* Fire up the incoming CPU's kthread and leaf rcu_node kthread. */ - if (rcu_scheduler_fully_active) - rcu_spawn_one_boost_kthread(rnp); + if (rcu_rnp_online_cpus(rnp)) + rcu_spawn_one_boost_kthread(rnp); } #else /* #ifdef CONFIG_RCU_BOOST */ @@ -1295,15 +1280,15 @@ static void rcu_preempt_boost_start_gp(struct rcu_node *rnp) { } -static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu) +static void rcu_spawn_one_boost_kthread(struct rcu_node *rnp) { } -static void __init rcu_spawn_boost_kthreads(void) +static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu) { } -static void rcu_prepare_kthreads(int cpu) +static void __init rcu_spawn_boost_kthreads(void) { } |