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Commit 3545832f authored by Byungchul Park's avatar Byungchul Park Committed by Paul E. McKenney
Browse files

rcu: Change return type of rcu_spawn_one_boost_kthread() 



The return value of rcu_spawn_one_boost_kthread() is not used any longer.
This commit therefore changes its return type from int to void, and
removes the cast to void from its callers.

Signed-off-by: default avatarByungchul Park <byungchul.park@lge.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.ibm.com>
parent 7e210a65

kernel/rcu/tree_plugin.h

+11 −9
Original line number Diff line number Diff line
@@ -1123,7 +1123,7 @@ static void rcu_preempt_boost_start_gp(struct rcu_node *rnp) 
 * already exist.  We only create this kthread for preemptible RCU.

 * Returns zero if all is well, a negated errno otherwise.

 */

static int rcu_spawn_one_boost_kthread(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;
@@ -1131,25 +1131,27 @@ static int rcu_spawn_one_boost_kthread(struct rcu_node *rnp) 
	struct task_struct *t;



	if (!IS_ENABLED(CONFIG_PREEMPT_RCU))

		return 0;

		return;



	if (!rcu_scheduler_fully_active || rcu_rnp_online_cpus(rnp) == 0)

		return 0;

		return;



	rcu_state.boost = 1;



	if (rnp->boost_kthread_task != NULL)

		return 0;

		return;



	t = kthread_create(rcu_boost_kthread, (void *)rnp,

			   "rcub/%d", rnp_index);

	if (IS_ERR(t))

		return PTR_ERR(t);

	if (WARN_ON_ONCE(IS_ERR(t)))

		return;



	raw_spin_lock_irqsave_rcu_node(rnp, flags);

	rnp->boost_kthread_task = t;

	raw_spin_unlock_irqrestore_rcu_node(rnp, flags);

	sp.sched_priority = kthread_prio;

	sched_setscheduler_nocheck(t, SCHED_FIFO, &sp);

	wake_up_process(t); /* get to TASK_INTERRUPTIBLE quickly. */

	return 0;

}



/*
@@ -1190,7 +1192,7 @@ static void __init rcu_spawn_boost_kthreads(void) 
	struct rcu_node *rnp;



	rcu_for_each_leaf_node(rnp)

		(void)rcu_spawn_one_boost_kthread(rnp);

		rcu_spawn_one_boost_kthread(rnp);

}



static void rcu_prepare_kthreads(int cpu)
@@ -1200,7 +1202,7 @@ static void rcu_prepare_kthreads(int cpu) 


	/* Fire up the incoming CPU's kthread and leaf rcu_node kthread. */

	if (rcu_scheduler_fully_active)

		(void)rcu_spawn_one_boost_kthread(rnp);

		rcu_spawn_one_boost_kthread(rnp);

}



#else /* #ifdef CONFIG_RCU_BOOST */