[PATCH tip/core/rcu 24/86] rcu: Switch to this_cpu() primitives

Paul E. McKenney
2011-05-01T13:37:52Z

From: Paul E. McKenney <paul.mckenney@linaro.org>

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>
---
kernel/rcutree.c | 10 +++-------
1 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index ee8442d..03f7148 100644
--- 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);
}

--
1.7.3.2