[PATCH] cpu hoptlug: avoid usage of smp_processor_id() in preemptible code

[Heiko Carstens <heiko.carstens@de.ibm.com>]

From: Heiko Carstens <heiko.carstens@de.ibm.com>

Replace smp_processor_id() with any_online_cpu(cpu_online_map) in order
to avoid lots of
"BUG: using smp_processor_id() in preemptible [00000001] code:..."
messages in case taking a cpu online fails.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
---

diffstat:
 kernel/sched.c      |    3 ++-
 kernel/softirq.c    |    3 ++-
 kernel/softlockup.c |    3 ++-
 kernel/workqueue.c  |    2 +-
 4 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 340dd23..d94ceef 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4680,7 +4680,8 @@ static int migration_call(struct notifie
 #ifdef CONFIG_HOTPLUG_CPU
 	case CPU_UP_CANCELED:
 		/* Unbind it from offline cpu so it can run.  Fall thru. */
-		kthread_bind(cpu_rq(cpu)->migration_thread,smp_processor_id());
+		kthread_bind(cpu_rq(cpu)->migration_thread,
+			     any_online_cpu(cpu_online_map));
 		kthread_stop(cpu_rq(cpu)->migration_thread);
 		cpu_rq(cpu)->migration_thread = NULL;
 		break;
diff --git a/kernel/softirq.c b/kernel/softirq.c
index f766b2f..ad3295c 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -470,7 +470,8 @@ static int __devinit cpu_callback(struct
 #ifdef CONFIG_HOTPLUG_CPU
 	case CPU_UP_CANCELED:
 		/* Unbind so it can run.  Fall thru. */
-		kthread_bind(per_cpu(ksoftirqd, hotcpu), smp_processor_id());
+		kthread_bind(per_cpu(ksoftirqd, hotcpu),
+			     any_online_cpu(cpu_online_map));
 	case CPU_DEAD:
 		p = per_cpu(ksoftirqd, hotcpu);
 		per_cpu(ksoftirqd, hotcpu) = NULL;
diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 7597620..a2dcceb 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -123,7 +123,8 @@ cpu_callback(struct notifier_block *nfb,
 #ifdef CONFIG_HOTPLUG_CPU
 	case CPU_UP_CANCELED:
 		/* Unbind so it can run.  Fall thru. */
-		kthread_bind(per_cpu(watchdog_task, hotcpu), smp_processor_id());
+		kthread_bind(per_cpu(watchdog_task, hotcpu),
+			     any_online_cpu(cpu_online_map));
 	case CPU_DEAD:
 		p = per_cpu(watchdog_task, hotcpu);
 		per_cpu(watchdog_task, hotcpu) = NULL;
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 7cee222..42df83d 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -524,7 +524,7 @@ static int __devinit workqueue_cpu_callb
 		list_for_each_entry(wq, &workqueues, list) {
 			/* Unbind so it can run. */
 			kthread_bind(per_cpu_ptr(wq->cpu_wq, hotcpu)->thread,
-				     smp_processor_id());
+				     any_online_cpu(cpu_online_map));
 			cleanup_workqueue_thread(wq, hotcpu);
 		}
 		break;