diff options
| author | Frederic Weisbecker <frederic@kernel.org> | 2022-02-16 16:42:08 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-04-11 17:05:58 -0700 |
| commit | 87c5adf06bfbf14c9d13e59d5d174ff5f2aafc0e (patch) | |
| tree | 6127a3426417ec257f2f84c57fc11b1a327aa8f5 /kernel/rcu/tree.c | |
| parent | 3352911fa9b47a90165e5c6fed440048c55146d1 (diff) | |
rcu/nocb: Initialize nocb kthreads only for boot CPU 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 NOCB kthreads related to 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 | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 70b33c55d39a..9f7441a78f90 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -4498,9 +4498,13 @@ static int __init rcu_spawn_gp_kthread(void) smp_store_release(&rcu_state.gp_kthread, t); /* ^^^ */ raw_spin_unlock_irqrestore_rcu_node(rnp, flags); wake_up_process(t); - rcu_spawn_nocb_kthreads(); /* This is a pre-SMP initcall, we expect a single CPU */ WARN_ON(num_online_cpus() > 1); + /* + * Those kthreads couldn't be created on rcu_init() -> rcutree_prepare_cpu() + * due to rcu_scheduler_fully_active. + */ + rcu_spawn_cpu_nocb_kthread(smp_processor_id()); rcu_spawn_one_boost_kthread(rdp->mynode); rcu_spawn_core_kthreads(); return 0; |