linux-kernel - [RFC PATCH v1 26/70] rcu, tree:

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Date:	Tue, 22 Jul 2014 21:59:02 -0400
From:	"Chen, Gong" <gong.chen@...ux.intel.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...nel.org, tglx@...utronix.de, paulus@...ba.org,
	benh@...nel.crashing.org, tony.luck@...el.com, hpa@...or.com,
	jkosina@...e.cz, rafael.j.wysocki@...el.com, bp@...en8.de,
	linux@....linux.org.uk, ralf@...ux-mips.org,
	schwidefsky@...ibm.com, davem@...emloft.net,
	viro@...iv.linux.org.uk, fweisbec@...il.com, cl@...ux.com,
	akpm@...ux-foundation.org, axboe@...nel.dk,
	JBottomley@...allels.com, neilb@...e.de,
	christoffer.dall@...aro.org, rostedt@...dmis.org, rric@...nel.org,
	gregkh@...uxfoundation.org, mhocko@...e.cz, david@...morbit.com,
	"Chen, Gong" <gong.chen@...ux.intel.com>
Subject: [RFC PATCH v1 26/70] rcu, tree: _FROZEN Cleanup

Remove XXX_FROZEN state from rcu/tree.

Signed-off-by: Chen, Gong <gong.chen@...ux.intel.com>
---
 kernel/rcu/tree.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 625d0b0..8518338 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3440,28 +3440,26 @@ static int rcu_cpu_notify(struct notifier_block *self,
 	struct rcu_state *rsp;
 
 	trace_rcu_utilization(TPS("Start CPU hotplug"));
-	switch (action) {
+	switch (action & ~CPU_TASKS_FROZEN) {
 	case CPU_UP_PREPARE:
-	case CPU_UP_PREPARE_FROZEN:
 		rcu_prepare_cpu(cpu);
 		rcu_prepare_kthreads(cpu);
 		break;
 	case CPU_ONLINE:
 	case CPU_DOWN_FAILED:
-		rcu_boost_kthread_setaffinity(rnp, -1);
+		if (!(action & CPU_TASKS_FROZEN))
+			rcu_boost_kthread_setaffinity(rnp, -1);
 		break;
 	case CPU_DOWN_PREPARE:
-		rcu_boost_kthread_setaffinity(rnp, cpu);
+		if (!(action & CPU_TASKS_FROZEN))
+			rcu_boost_kthread_setaffinity(rnp, cpu);
 		break;
 	case CPU_DYING:
-	case CPU_DYING_FROZEN:
 		for_each_rcu_flavor(rsp)
 			rcu_cleanup_dying_cpu(rsp);
 		break;
 	case CPU_DEAD:
-	case CPU_DEAD_FROZEN:
 	case CPU_UP_CANCELED:
-	case CPU_UP_CANCELED_FROZEN:
 		for_each_rcu_flavor(rsp)
 			rcu_cleanup_dead_cpu(cpu, rsp);
 		break;
-- 
2.0.0.rc2

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