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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2009-08-15 09:53:48 -0700
committerIngo Molnar <mingo@elte.hu>2009-08-15 19:02:08 +0200
commit2e597558086dec36d5c33521a36e0f6b1bc3f3a7 (patch)
treece8c6ced1c8a3b6bf6170a5894e1d7102e6ee9d4 /kernel/rcupreempt.c
parent799e64f05f4bfaad2bb3165cab95c8c992a1c296 (diff)
downloadop-kernel-dev-2e597558086dec36d5c33521a36e0f6b1bc3f3a7.zip
op-kernel-dev-2e597558086dec36d5c33521a36e0f6b1bc3f3a7.tar.gz
rcu: Simplify RCU CPU-hotplug notification
Use the new cpu_notifier() API to simplify RCU's CPU-hotplug notifiers, collapsing down to a single such notifier. This makes it trivial to provide the notifier-ordering guarantee that rcu_barrier() depends on. Also remove redundant open_softirq() calls from Hierarchical RCU notifier. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: josht@linux.vnet.ibm.com Cc: akpm@linux-foundation.org Cc: mathieu.desnoyers@polymtl.ca Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: hugh.dickins@tiscali.co.uk Cc: benh@kernel.crashing.org LKML-Reference: <12503552312510-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/rcupreempt.c')
-rw-r--r--kernel/rcupreempt.c25
1 files changed, 2 insertions, 23 deletions
diff --git a/kernel/rcupreempt.c b/kernel/rcupreempt.c
index beb0e65..9b87f51 100644
--- a/kernel/rcupreempt.c
+++ b/kernel/rcupreempt.c
@@ -1417,8 +1417,8 @@ int rcu_pending(int cpu)
return 0;
}
-static int __cpuinit rcu_cpu_notify(struct notifier_block *self,
- unsigned long action, void *hcpu)
+int __cpuinit rcu_cpu_notify(struct notifier_block *self,
+ unsigned long action, void *hcpu)
{
long cpu = (long)hcpu;
@@ -1439,10 +1439,6 @@ static int __cpuinit rcu_cpu_notify(struct notifier_block *self,
return NOTIFY_OK;
}
-static struct notifier_block __cpuinitdata rcu_nb = {
- .notifier_call = rcu_cpu_notify,
-};
-
void __init __rcu_init(void)
{
int cpu;
@@ -1471,23 +1467,6 @@ void __init __rcu_init(void)
rdp->waitschedtail = &rdp->waitschedlist;
rdp->rcu_sched_sleeping = 0;
}
- register_cpu_notifier(&rcu_nb);
-
- /*
- * We don't need protection against CPU-Hotplug here
- * since
- * a) If a CPU comes online while we are iterating over the
- * cpu_online_mask below, we would only end up making a
- * duplicate call to rcu_online_cpu() which sets the corresponding
- * CPU's mask in the rcu_cpu_online_map.
- *
- * b) A CPU cannot go offline at this point in time since the user
- * does not have access to the sysfs interface, nor do we
- * suspend the system.
- */
- for_each_online_cpu(cpu)
- rcu_cpu_notify(&rcu_nb, CPU_UP_PREPARE, (void *)(long) cpu);
-
open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
}
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