linux-kernel - [PATCH 13/16] rcu: Spawn nocb kthreads from rcu_prepare

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Date:	Wed, 23 Jul 2014 01:09:50 -0400
From:	Pranith Kumar <bobby.prani@...il.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	linux-kernel@...r.kernel.org (open list:READ-COPY UPDATE...)
Subject: [PATCH 13/16] rcu: Spawn nocb kthreads from rcu_prepare_kthreads()

rcu_prepare_kthreads() is called when a CPU hotplug event happens. We can also
spawn the nocb kthreads from this function. This is preparation for the next
patch which remove the redundant check for rcu_scheduler_fully_active. This
commit moves the spawning of nocb kthreads to rcu_prepare_kthreads().

Signed-off-by: Pranith Kumar <bobby.prani@...il.com>
---
 kernel/rcu/tree.c        | 1 -
 kernel/rcu/tree_plugin.h | 2 ++
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index afd54e2..4dc449c 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3453,7 +3453,6 @@ static int rcu_cpu_notify(struct notifier_block *self,
 	case CPU_UP_PREPARE_FROZEN:
 		rcu_prepare_cpu(cpu);
 		rcu_prepare_kthreads(cpu);
-		rcu_spawn_all_nocb_kthreads(cpu);
 		break;
 	case CPU_ONLINE:
 	case CPU_DOWN_FAILED:
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 4d42791..9a50e1d 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1488,6 +1488,8 @@ static void rcu_prepare_kthreads(int cpu)
 	/* Fire up the incoming CPU's kthread and leaf rcu_node kthread. */
 	if (rcu_scheduler_fully_active)
 		rcu_spawn_one_boost_kthread(rcu_state_p, rnp);
+
+	rcu_spawn_all_nocb_kthreads(cpu);
 }
 
 #else /* #ifdef CONFIG_RCU_BOOST */
-- 
2.0.0.rc2

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