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| author | Frederic Weisbecker <frederic@kernel.org> | 2022-02-16 16:42:07 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-04-11 17:05:58 -0700 |
| commit | 3352911fa9b47a90165e5c6fed440048c55146d1 (patch) | |
| tree | f185cee952395496318080742fd9d2c62c9c9ff7 /kernel/rcu/tree.c | |
| parent | 2eed973adc6e749439730e53e6220b122398d319 (diff) | |
| download | linux-3352911fa9b47a90165e5c6fed440048c55146d1.tar.bz2 | |
rcu: Initialize boost kthread only for boot node prior SMP initialization
The rcu_spawn_gp_kthread() function is called as an early initcall,
which means that SMP initialization hasn't happened yet and only the
boot CPU is online. Therefore, create only the boost kthread for the
leaf node of the boot CPU.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Neeraj Upadhyay <quic_neeraju@quicinc.com>
Cc: Uladzislau Rezki <uladzislau.rezki@sony.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/tree.c')
| -rw-r--r-- | kernel/rcu/tree.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index e6a9e5744e45..70b33c55d39a 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -4480,6 +4480,7 @@ static int __init rcu_spawn_gp_kthread(void) struct rcu_node *rnp; struct sched_param sp; struct task_struct *t; + struct rcu_data *rdp = this_cpu_ptr(&rcu_data); rcu_scheduler_fully_active = 1; t = kthread_create(rcu_gp_kthread, NULL, "%s", rcu_state.name); @@ -4498,7 +4499,9 @@ static int __init rcu_spawn_gp_kthread(void) raw_spin_unlock_irqrestore_rcu_node(rnp, flags); wake_up_process(t); rcu_spawn_nocb_kthreads(); - rcu_spawn_boost_kthreads(); + /* This is a pre-SMP initcall, we expect a single CPU */ + WARN_ON(num_online_cpus() > 1); + rcu_spawn_one_boost_kthread(rdp->mynode); rcu_spawn_core_kthreads(); return 0; } |