[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>

diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 7920861..85defd0 100644 (file)
--- 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);

diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index ca90ee3..eb08d04 100644 (file)
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -136,7 +136,7 @@ static inline void set_vtimer(__u64 expires)
 }
 #endif
 
-static void start_cpu_timer(void)
+void vtime_start_cpu_timer(void)
 {
        struct vtimer_queue *vt_list;
 
@@ -150,7 +150,7 @@ static void start_cpu_timer(void)
                set_vtimer(vt_list->idle);
 }
 
-static void stop_cpu_timer(void)
+void vtime_stop_cpu_timer(void)
 {
        struct vtimer_queue *vt_list;
 
@@ -536,24 +536,6 @@ void init_cpu_vtimer(void)
 
 }
 
-static int vtimer_idle_notify(struct notifier_block *self,
-                             unsigned long action, void *hcpu)
-{
-       switch (action) {
-       case S390_CPU_IDLE:
-               stop_cpu_timer();
-               break;
-       case S390_CPU_NOT_IDLE:
-               start_cpu_timer();
-               break;
-       }
-       return NOTIFY_OK;
-}
-
-static struct notifier_block vtimer_idle_nb = {
-       .notifier_call = vtimer_idle_notify,
-};
-
 void __init vtime_init(void)
 {
        /* request the cpu timer external interrupt */
@@ -561,9 +543,6 @@ void __init vtime_init(void)
                                              &ext_int_info_timer) != 0)
                panic("Couldn't request external interrupt 0x1005");
 
-       if (register_idle_notifier(&vtimer_idle_nb))
-               panic("Couldn't register idle notifier");
-
        /* Enable cpu timer interrupts on the boot cpu. */
        init_cpu_vtimer();
 }

diff --git a/include/asm-s390/processor.h b/include/asm-s390/processor.h
index 5483c28..4af80af 100644 (file)
--- a/include/asm-s390/processor.h
+++ b/include/asm-s390/processor.h
@@ -336,16 +336,6 @@ extern void (*s390_base_mcck_handler_fn)(void);
 extern void (*s390_base_pgm_handler_fn)(void);
 extern void (*s390_base_ext_handler_fn)(void);
 
-/*
- * CPU idle notifier chain.
- */
-#define S390_CPU_IDLE          0
-#define S390_CPU_NOT_IDLE      1
-
-struct notifier_block;
-int register_idle_notifier(struct notifier_block *nb);
-int unregister_idle_notifier(struct notifier_block *nb);
-
 #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
 
 #endif

diff --git a/include/asm-s390/timer.h b/include/asm-s390/timer.h
index adb3486..d98d79e 100644 (file)
--- a/include/asm-s390/timer.h
+++ b/include/asm-s390/timer.h
@@ -48,6 +48,18 @@ extern int del_virt_timer(struct vtimer_list *timer);
 extern void init_cpu_vtimer(void);
 extern void vtime_init(void);
 
+#ifdef CONFIG_VIRT_TIMER
+
+extern void vtime_start_cpu_timer(void);
+extern void vtime_stop_cpu_timer(void);
+
+#else
+
+static inline void vtime_start_cpu_timer(void) { }
+static inline void vtime_stop_cpu_timer(void) { }
+
+#endif /* CONFIG_VIRT_TIMER */
+
 #endif /* __KERNEL__ */
 
 #endif /* _ASM_S390_TIMER_H */