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rcu: Change return type of rcu_spawn_one_boost_kthread()

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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: Byungchul Park <byungchul.park@lge.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Byungchul Park 2019-07-01 09:40:39 +09:00 committed by Paul E. McKenney
parent 7e210a653e
commit 3545832fc2
1 changed files with 11 additions and 9 deletions
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20
kernel/rcu/tree_plugin.h
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@ -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 */