[PATCH 6/6] rcu/nocb: Merge rcu_spawn_cpu_nocb_kthread() and rcu_spawn_one_nocb_kthread()

Frederic Weisbecker
2021-11-17T15:57:04Z

rcu_spawn_one_nocb_kthread() is only called by
rcu_spawn_cpu_nocb_kthread(). Don't bother with two separate functions
and merge them.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Neeraj Upadhyay <quic_neeraju@quicinc.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Uladzislau Rezki <urezki@gmail.com>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Joel Fernandes <joel@joelfernandes.org>
---
kernel/rcu/tree_nocb.h | 15 ++++-----------
1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h
index 3845f1885ffc..248b90333b08 100644
--- a/kernel/rcu/tree_nocb.h
+++ b/kernel/rcu/tree_nocb.h
@@ -1217,12 +1217,15 @@ static void __init rcu_boot_init_nocb_percpu_data(struct rcu_data *rdp)
* rcuo CB kthread, spawn it. Additionally, if the rcuo GP kthread
* for this CPU's group has not yet been created, spawn it as well.
*/
-static void rcu_spawn_one_nocb_kthread(int cpu)
+static void rcu_spawn_cpu_nocb_kthread(int cpu)
{
struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu);
struct rcu_data *rdp_gp;
struct task_struct *t;

+ if (!rcu_scheduler_fully_active || !rcu_nocb_is_setup)
+ return;
+
/* If it already has an rcuo kthread, then nothing to do. */
if (rdp->nocb_cb_kthread)
return;
@@ -1246,16 +1249,6 @@ static void rcu_spawn_one_nocb_kthread(int cpu)
WRITE_ONCE(rdp->nocb_gp_kthread, rdp_gp->nocb_gp_kthread);
}

-/*
- * If the specified CPU is a no-CBs CPU that does not already have its
- * rcuo kthread, spawn it.
- */
-static void rcu_spawn_cpu_nocb_kthread(int cpu)
-{
- if (rcu_scheduler_fully_active && rcu_nocb_is_setup)
- rcu_spawn_one_nocb_kthread(cpu);
-}
-
/*
* Once the scheduler is running, spawn rcuo kthreads for all online
* no-CBs CPUs. This assumes that the early_initcall()s happen before
--
2.25.1