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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2014-10-23 10:50:41 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2014-10-29 10:20:07 -0700
commit776d680711f4836964f3005ee53794661ca74629 (patch)
treecf879af6d61e6fcc19ed0cf8b6974813e5922ddd /kernel/rcu
parent28f6569ab7d036cd4ee94c26bb76dc1b3f3fc056 (diff)
downloadlinux-776d680711f4836964f3005ee53794661ca74629.tar.bz2
rcu: Kick rcuo kthreads after their CPU goes offline
If a no-CBs CPU were to post an RCU callback with interrupts disabled after it entered the idle loop for the last time, there might be no deferred wakeup for the corresponding rcuo kthreads. This commit therefore adds a set of calls to do_nocb_deferred_wakeup() after the CPU has gone completely offline. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/tree.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 9e3c20f117cd..07bf4aa68d50 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3497,8 +3497,10 @@ static int rcu_cpu_notify(struct notifier_block *self,
case CPU_DEAD_FROZEN:
case CPU_UP_CANCELED:
case CPU_UP_CANCELED_FROZEN:
- for_each_rcu_flavor(rsp)
+ for_each_rcu_flavor(rsp) {
rcu_cleanup_dead_cpu(cpu, rsp);
+ do_nocb_deferred_wakeup(per_cpu_ptr(rsp->rda, cpu));
+ }
break;
default:
break;