linux-kernel - [PATCH rcu 18/18] rcu/nocb: Merge rcu_spawn_cpu_nocb_kthread() and rcu_spawn_one_nocb

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Message-Id: <20211202002912.3127710-18-paulmck@kernel.org>
Date:   Wed,  1 Dec 2021 16:29:12 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
        jiangshanlai@...il.com, akpm@...ux-foundation.org,
        mathieu.desnoyers@...icios.com, josh@...htriplett.org,
        tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, joel@...lfernandes.org,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Uladzislau Rezki <urezki@...il.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 18/18] rcu/nocb: Merge rcu_spawn_cpu_nocb_kthread() and rcu_spawn_one_nocb_kthread()

From: Frederic Weisbecker <frederic@...nel.org>

The rcu_spawn_one_nocb_kthread() function is called only from
rcu_spawn_cpu_nocb_kthread().  Therefore, inline the former into
the latter, saving a few lines of code.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
Cc: Neeraj Upadhyay <quic_neeraju@...cinc.com>
Cc: Boqun Feng <boqun.feng@...il.com>
Cc: Uladzislau Rezki <urezki@...il.com>
Cc: Josh Triplett <josh@...htriplett.org>
Cc: Joel Fernandes <joel@...lfernandes.org>
Tested-by: Juri Lelli <juri.lelli@...hat.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.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 0c1802ce4764c..eeafb546a7a09 100644
--- a/kernel/rcu/tree_nocb.h
+++ b/kernel/rcu/tree_nocb.h
@@ -1233,12 +1233,15 @@ 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 there already is an rcuo kthread, then nothing to do. */
 	if (rdp->nocb_cb_kthread)
 		return;
@@ -1262,16 +1265,6 @@ 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
-- 
2.31.1.189.g2e36527f23