* [PATCH RFC -rt] Alleged fix for CPU-hotplug deadlock
@ 2012-02-21 20:00 Paul E. McKenney
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From: Paul E. McKenney @ 2012-02-21 20:00 UTC (permalink / raw)
To: rostedt; +Cc: linux-rt-users, linux-kernel
This patch is intended to fix a deadlock seen in -rt. Untested, might
not even compile. The intent is to move kthread_stop() outside of
the CPU-hotplug lock, thus preventing deadlocks involving sleeping
spinlocks.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 8c26a49..e0d514b 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -2041,8 +2041,7 @@ static int __cpuinit rcu_cpu_notify(struct notifier_block *self,
rcu_send_cbs_to_online(&rcu_sched_state);
rcu_preempt_send_cbs_to_online();
break;
- case CPU_DEAD:
- case CPU_DEAD_FROZEN:
+ case CPU_POST_DEAD:
case CPU_UP_CANCELED:
case CPU_UP_CANCELED_FROZEN:
rcu_offline_cpu(cpu);
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2012-02-21 20:00 [PATCH RFC -rt] Alleged fix for CPU-hotplug deadlock Paul E. McKenney
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