s390/mm/pfault: Convert to hotplug state machine

Install the callbacks via the state machine.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: linux-s390@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: rt@linutronix.de
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Link: http://lkml.kernel.org/r/20160906170457.32393-18-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 12 insertions, 18 deletions

diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index a58bca62a93b..cbb73fabc91e 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -740,28 +740,21 @@ out:
         put_task_struct(tsk);
 }
 
-static int pfault_cpu_notify(struct notifier_block *self, unsigned long action,
-                             void *hcpu)
+static int pfault_cpu_dead(unsigned int cpu)
 {
         struct thread_struct *thread, *next;
         struct task_struct *tsk;
 
-        switch (action & ~CPU_TASKS_FROZEN) {
-        case CPU_DEAD:
-                spin_lock_irq(&pfault_lock);
-                list_for_each_entry_safe(thread, next, &pfault_list, list) {
-                        thread->pfault_wait = 0;
-                        list_del(&thread->list);
-                        tsk = container_of(thread, struct task_struct, thread);
-                        wake_up_process(tsk);
-                        put_task_struct(tsk);
-                }
-                spin_unlock_irq(&pfault_lock);
-                break;
-        default:
-                break;
+        spin_lock_irq(&pfault_lock);
+        list_for_each_entry_safe(thread, next, &pfault_list, list) {
+                thread->pfault_wait = 0;
+                list_del(&thread->list);
+                tsk = container_of(thread, struct task_struct, thread);
+                wake_up_process(tsk);
+                put_task_struct(tsk);
         }
-        return NOTIFY_OK;
+        spin_unlock_irq(&pfault_lock);
+        return 0;
 }
 
 static int __init pfault_irq_init(void)
@@ -775,7 +768,8 @@ static int __init pfault_irq_init(void)
         if (rc)
                 goto out_pfault;
         irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL);
-        hotcpu_notifier(pfault_cpu_notify, 0);
+        cpuhp_setup_state_nocalls(CPUHP_S390_PFAULT_DEAD, "s390/pfault:dead",
+                                  NULL, pfault_cpu_dead);
         return 0;
 
 out_pfault: