[S390] idle: remove idle notifier chain.

The idle notifier chain consists of at most one element. So there's
no point in having a notifier chain. Remove it and directly call the
function.

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

1 files changed, 2 insertions, 30 deletions

diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 7920861109d2..85defd01d293 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -75,46 +75,19 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
         return sf->gprs[8];
 }
 
-/*
- * Need to know about CPUs going idle?
- */
-static ATOMIC_NOTIFIER_HEAD(idle_chain);
 DEFINE_PER_CPU(struct s390_idle_data, s390_idle);
 
-int register_idle_notifier(struct notifier_block *nb)
-{
-        return atomic_notifier_chain_register(&idle_chain, nb);
-}
-EXPORT_SYMBOL(register_idle_notifier);
-
-int unregister_idle_notifier(struct notifier_block *nb)
-{
-        return atomic_notifier_chain_unregister(&idle_chain, nb);
-}
-EXPORT_SYMBOL(unregister_idle_notifier);
-
 static int s390_idle_enter(void)
 {
         struct s390_idle_data *idle;
-        int nr_calls = 0;
-        void *hcpu;
-        int rc;
 
-        hcpu = (void *)(long)smp_processor_id();
-        rc = __atomic_notifier_call_chain(&idle_chain, S390_CPU_IDLE, hcpu, -1,
-                                          &nr_calls);
-        if (rc == NOTIFY_BAD) {
-                nr_calls--;
-                __atomic_notifier_call_chain(&idle_chain, S390_CPU_NOT_IDLE,
-                                             hcpu, nr_calls, NULL);
-                return rc;
-        }
         idle = &__get_cpu_var(s390_idle);
         spin_lock(&idle->lock);
         idle->idle_count++;
         idle->in_idle = 1;
         idle->idle_enter = get_clock();
         spin_unlock(&idle->lock);
+        vtime_stop_cpu_timer();
         return NOTIFY_OK;
 }
 
@@ -122,13 +95,12 @@ void s390_idle_leave(void)
 {
         struct s390_idle_data *idle;
 
+        vtime_start_cpu_timer();
         idle = &__get_cpu_var(s390_idle);
         spin_lock(&idle->lock);
         idle->idle_time += get_clock() - idle->idle_enter;
         idle->in_idle = 0;
         spin_unlock(&idle->lock);
-        atomic_notifier_call_chain(&idle_chain, S390_CPU_NOT_IDLE,
-                                   (void *)(long) smp_processor_id());
 }
 
 extern void s390_handle_mcck(void);