[S390] irq change improvements.

Remove the last few places where a pointer to pt_regs gets passed.
Also make sure we call set_irq_regs() before irq_enter() and after
irq_exit(). This doesn't fix anything but makes sure s390 looks the
same like all other architectures.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/appldata/appldata_base.c

@@ -109,7 +109,7 @@ static LIST_HEAD(appldata_ops_list);
  *
  * schedule work and reschedule timer
  */
-static void appldata_timer_function(unsigned long data, struct pt_regs *regs)
+static void appldata_timer_function(unsigned long data)
 {
 	P_DEBUG("   -= Timer =-\n");
 	P_DEBUG("CPU: %i, expire_count: %i\n", smp_processor_id(),

arch/s390/kernel/s390_ext.c

@@ -117,8 +117,8 @@ void do_extint(struct pt_regs *regs, unsigned short code)
         int index;
 	struct pt_regs *old_regs;
 
-	irq_enter();
 	old_regs = set_irq_regs(regs);
+	irq_enter();
 	asm volatile ("mc 0,0");
 	if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer)
 		/**
@@ -134,8 +134,8 @@ void do_extint(struct pt_regs *regs, unsigned short code)
 				p->handler(code);
 		}
 	}
-	set_irq_regs(old_regs);
 	irq_exit();
+	set_irq_regs(old_regs);
 }
 
 EXPORT_SYMBOL(register_external_interrupt);

arch/s390/kernel/vtime.c

@@ -209,11 +209,11 @@ static void list_add_sorted(struct vtimer_list *timer, struct list_head *head)
  * Do the callback functions of expired vtimer events.
  * Called from within the interrupt handler.
  */
-static void do_callbacks(struct list_head *cb_list, struct pt_regs *regs)
+static void do_callbacks(struct list_head *cb_list)
 {
 	struct vtimer_queue *vt_list;
 	struct vtimer_list *event, *tmp;
-	void (*fn)(unsigned long, struct pt_regs*);
+	void (*fn)(unsigned long);
 	unsigned long data;
 
 	if (list_empty(cb_list))
@@ -224,7 +224,7 @@ static void do_callbacks(struct list_head *cb_list, struct pt_regs *regs)
 	list_for_each_entry_safe(event, tmp, cb_list, entry) {
 		fn = event->function;
 		data = event->data;
-		fn(data, regs);
+		fn(data);
 
 		if (!event->interval)
 			/* delete one shot timer */
@@ -275,7 +275,7 @@ static void do_cpu_timer_interrupt(__u16 error_code)
 		list_move_tail(&event->entry, &cb_list);
 	}
 	spin_unlock(&vt_list->lock);
-	do_callbacks(&cb_list, get_irq_regs());
+	do_callbacks(&cb_list);
 
 	/* next event is first in list */
 	spin_lock(&vt_list->lock);

drivers/s390/cio/cio.c

@@ -609,8 +609,8 @@ do_IRQ (struct pt_regs *regs)
 	struct irb *irb;
 	struct pt_regs *old_regs;
 
-	irq_enter ();
 	old_regs = set_irq_regs(regs);
+	irq_enter();
 	asm volatile ("mc 0,0");
 	if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer)
 		/**
@@ -655,8 +655,8 @@ do_IRQ (struct pt_regs *regs)
 		 * out of the sie which costs more cycles than it saves.
 		 */
 	} while (!MACHINE_IS_VM && tpi (NULL) != 0);
+	irq_exit();
 	set_irq_regs(old_regs);
-	irq_exit ();
 }
 
 #ifdef CONFIG_CCW_CONSOLE

include/asm-s390/timer.h

@@ -26,7 +26,7 @@ struct vtimer_list {
 	spinlock_t lock;
 	unsigned long magic;
 
-	void (*function)(unsigned long, struct pt_regs*);
+	void (*function)(unsigned long);
 	unsigned long data;
 };