time: Replace __get_cpu_var uses

Convert uses of __get_cpu_var for creating a address from a percpu
offset to this_cpu_ptr.

The two cases where get_cpu_var is used to actually access a percpu
variable are changed to use this_cpu_read/raw_cpu_read.

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 64c5990..066f0ec 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -554,7 +554,7 @@
 void tick_check_oneshot_broadcast_this_cpu(void)
 {
 	if (cpumask_test_cpu(smp_processor_id(), tick_broadcast_oneshot_mask)) {
-		struct tick_device *td = &__get_cpu_var(tick_cpu_device);
+		struct tick_device *td = this_cpu_ptr(&tick_cpu_device);
 
 		/*
 		 * We might be in the middle of switching over from