Commit-ID: b0f740360efec6e6471547c0548f250bc045a233
Gitweb: http://git.kernel.org/tip/b0f740360efec6e6471547c0548f250bc045a233
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Mon, 4 Feb 2013 12:14:24 -0800
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Tue, 12 Mar 2013 14:07:37 -0700
rcu: Avoid invoking RCU core on offline CPUs
Offline CPUs transition through the scheduler to the idle loop one
last time before being shut down. This can result in RCU raising
softirq on this CPU, which is at best useless given that the CPU's
callbacks will be offloaded at CPU_DEAD time. This commit therefore
avoids raising softirq on offline CPUs.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
kernel/rcutree.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 157539a..b2fc234 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -2169,7 +2169,8 @@ static void invoke_rcu_callbacks(struct rcu_state *rsp, struct rcu_data *rdp)
static void invoke_rcu_core(void)
{
- raise_softirq(RCU_SOFTIRQ);
+ if (cpu_online(smp_processor_id()))
+ raise_softirq(RCU_SOFTIRQ);
}
/*
--
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