kernel/: convert cpu notifier to return encapsulate errno value

By the previous modification, the cpu notifier can return encapsulate
errno value.  This converts the cpu notifiers for kernel/*.c
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

kernel/padata.c

@@ -659,7 +659,7 @@ static int padata_cpu_callback(struct notifier_block *nfb,
 		err = __padata_add_cpu(pinst, cpu);
 		mutex_unlock(&pinst->lock);
 		if (err)
-			return NOTIFY_BAD;
+			return notifier_from_errno(err);
 		break;
 
 	case CPU_DOWN_PREPARE:
@@ -670,7 +670,7 @@ static int padata_cpu_callback(struct notifier_block *nfb,
 		err = __padata_remove_cpu(pinst, cpu);
 		mutex_unlock(&pinst->lock);
 		if (err)
-			return NOTIFY_BAD;
+			return notifier_from_errno(err);
 		break;
 
 	case CPU_UP_CANCELED:

kernel/profile.c

@@ -372,7 +372,7 @@ static int __cpuinit profile_cpu_callback(struct notifier_block *info,
 					GFP_KERNEL | __GFP_ZERO,
 					0);
 			if (!page)
-				return NOTIFY_BAD;
+				return notifier_from_errno(-ENOMEM);
 			per_cpu(cpu_profile_hits, cpu)[1] = page_address(page);
 		}
 		if (!per_cpu(cpu_profile_hits, cpu)[0]) {
@@ -388,7 +388,7 @@ static int __cpuinit profile_cpu_callback(struct notifier_block *info,
 		page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[1]);
 		per_cpu(cpu_profile_hits, cpu)[1] = NULL;
 		__free_page(page);
-		return NOTIFY_BAD;
+		return notifier_from_errno(-ENOMEM);
 	case CPU_ONLINE:
 	case CPU_ONLINE_FROZEN:
 		if (prof_cpu_mask != NULL)

kernel/relay.c

@@ -539,7 +539,7 @@ static int __cpuinit relay_hotcpu_callback(struct notifier_block *nb,
 					"relay_hotcpu_callback: cpu %d buffer "
 					"creation failed\n", hotcpu);
 				mutex_unlock(&relay_channels_mutex);
-				return NOTIFY_BAD;
+				return notifier_from_errno(-ENOMEM);
 			}
 		}
 		mutex_unlock(&relay_channels_mutex);

kernel/smp.c

@@ -52,7 +52,7 @@ hotplug_cfd(struct notifier_block *nfb, unsigned long action, void *hcpu)
 	case CPU_UP_PREPARE_FROZEN:
 		if (!zalloc_cpumask_var_node(&cfd->cpumask, GFP_KERNEL,
 				cpu_to_node(cpu)))
-			return NOTIFY_BAD;
+			return notifier_from_errno(-ENOMEM);
 		break;
 
 #ifdef CONFIG_HOTPLUG_CPU

kernel/softirq.c

@@ -808,7 +808,7 @@ static int __cpuinit cpu_callback(struct notifier_block *nfb,
 		p = kthread_create(run_ksoftirqd, hcpu, "ksoftirqd/%d", hotcpu);
 		if (IS_ERR(p)) {
 			printk("ksoftirqd for %i failed\n", hotcpu);
-			return NOTIFY_BAD;
+			return notifier_from_errno(PTR_ERR(p));
 		}
 		kthread_bind(p, hotcpu);
   		per_cpu(ksoftirqd, hotcpu) = p;

kernel/timer.c

@@ -1680,11 +1680,14 @@ static int __cpuinit timer_cpu_notify(struct notifier_block *self,
 				unsigned long action, void *hcpu)
 {
 	long cpu = (long)hcpu;
+	int err;
+
 	switch(action) {
 	case CPU_UP_PREPARE:
 	case CPU_UP_PREPARE_FROZEN:
-		if (init_timers_cpu(cpu) < 0)
-			return NOTIFY_BAD;
+		err = init_timers_cpu(cpu);
+		if (err < 0)
+			return notifier_from_errno(err);
 		break;
 #ifdef CONFIG_HOTPLUG_CPU
 	case CPU_DEAD:

kernel/workqueue.c

@@ -1110,7 +1110,7 @@ static int __devinit workqueue_cpu_callback(struct notifier_block *nfb,
 	unsigned int cpu = (unsigned long)hcpu;
 	struct cpu_workqueue_struct *cwq;
 	struct workqueue_struct *wq;
-	int ret = NOTIFY_OK;
+	int err = 0;
 
 	action &= ~CPU_TASKS_FROZEN;
 
@@ -1124,12 +1124,13 @@ static int __devinit workqueue_cpu_callback(struct notifier_block *nfb,
 
 		switch (action) {
 		case CPU_UP_PREPARE:
-			if (!create_workqueue_thread(cwq, cpu))
+			err = create_workqueue_thread(cwq, cpu);
+			if (!err)
 				break;
 			printk(KERN_ERR "workqueue [%s] for %i failed\n",
 				wq->name, cpu);
 			action = CPU_UP_CANCELED;
-			ret = NOTIFY_BAD;
+			err = -ENOMEM;
 			goto undo;
 
 		case CPU_ONLINE:
@@ -1150,7 +1151,7 @@ static int __devinit workqueue_cpu_callback(struct notifier_block *nfb,
 		cpumask_clear_cpu(cpu, cpu_populated_map);
 	}
 
-	return ret;
+	return notifier_from_errno(err);
 }
 
 #ifdef CONFIG_SMP