IB/ehca: Misc cpuinit section annotations and #ifdef cleanups

* Replace {un}register_cpu_notifier with {un}register_hotcpu_notifier
  thereby losing a couple of #ifdef HOTPLUG_CPU pairs.
* Move comp_pool_callback_nb declaration to below that of callback
  function so that initialization of .notifier_call and .priority can
  occur at build time itself and not runtime.
* Mark the notifier_block (and callback function, and another static
  function used by it) as __cpuinit{data} for the sake of consistency
  and remove enclosing #ifdef. (This may increase size for modular
  build of this module, however, because these are no longer dropped
  unconditionally now.)
Signed-off-by: Satyam Sharma <satyam@infradead.org>
Acked-by: Joachim Fenkes <fenkes@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/ehca/ehca_irq.c

@@ -69,9 +69,6 @@
 static void queue_comp_task(struct ehca_cq *__cq);
 
 static struct ehca_comp_pool *pool;
-#ifdef CONFIG_HOTPLUG_CPU
-static struct notifier_block comp_pool_callback_nb;
-#endif
 
 static inline void comp_event_callback(struct ehca_cq *cq)
 {
@@ -760,9 +757,7 @@ static void destroy_comp_task(struct ehca_comp_pool *pool,
 		kthread_stop(task);
 }
 
-#ifdef CONFIG_HOTPLUG_CPU
-static void take_over_work(struct ehca_comp_pool *pool,
-			   int cpu)
+static void __cpuinit take_over_work(struct ehca_comp_pool *pool, int cpu)
 {
 	struct ehca_cpu_comp_task *cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
 	LIST_HEAD(list);
@@ -785,7 +780,7 @@ static void take_over_work(struct ehca_comp_pool *pool,
 
 }
 
-static int comp_pool_callback(struct notifier_block *nfb,
+static int __cpuinit comp_pool_callback(struct notifier_block *nfb,
 					unsigned long action,
 					void *hcpu)
 {
@@ -833,7 +828,11 @@ static int comp_pool_callback(struct notifier_block *nfb,
 
 	return NOTIFY_OK;
 }
-#endif
+
+static struct notifier_block comp_pool_callback_nb __cpuinitdata = {
+	.notifier_call	= comp_pool_callback,
+	.priority	= 0,
+};
 
 int ehca_create_comp_pool(void)
 {
@@ -864,11 +863,7 @@ int ehca_create_comp_pool(void)
 		}
 	}
 
-#ifdef CONFIG_HOTPLUG_CPU
-	comp_pool_callback_nb.notifier_call = comp_pool_callback;
-	comp_pool_callback_nb.priority = 0;
-	register_cpu_notifier(&comp_pool_callback_nb);
-#endif
+	register_hotcpu_notifier(&comp_pool_callback_nb);
 
 	printk(KERN_INFO "eHCA scaling code enabled\n");
 
@@ -882,9 +877,7 @@ void ehca_destroy_comp_pool(void)
 	if (!ehca_scaling_code)
 		return;
 
-#ifdef CONFIG_HOTPLUG_CPU
-	unregister_cpu_notifier(&comp_pool_callback_nb);
-#endif
+	unregister_hotcpu_notifier(&comp_pool_callback_nb);
 
 	for (i = 0; i < NR_CPUS; i++) {
 		if (cpu_online(i))