Messages in this thread Patch in this message |  | | | Date | Tue, 21 Feb 2012 12:00:09 -0800 | | From | "Paul E. McKenney" <> | | Subject | [PATCH RFC -rt] Alleged fix for CPU-hotplug deadlock |
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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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