rcu: Switch to this_cpu() primitives

This removes a couple of lines from invoke_rcu_cpu_kthread(), improving
readability.

Reported-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 575d641..27304bc 100644 (file)
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1480,18 +1480,14 @@ static void rcu_process_callbacks(void)
 static void invoke_rcu_cpu_kthread(void)
 {
        unsigned long flags;
-       wait_queue_head_t *q;
-       int cpu;
 
        local_irq_save(flags);
-       cpu = smp_processor_id();
-       per_cpu(rcu_cpu_has_work, cpu) = 1;
-       if (per_cpu(rcu_cpu_kthread_task, cpu) == NULL) {
+       __this_cpu_write(rcu_cpu_has_work, 1);
+       if (__this_cpu_read(rcu_cpu_kthread_task) == NULL) {
                local_irq_restore(flags);
                return;
        }
-       q = &per_cpu(rcu_cpu_wq, cpu);
-       wake_up(q);
+       wake_up(&__get_cpu_var(rcu_cpu_wq));
        local_irq_restore(flags);
 }