WorkStruct: Typedef the work function prototype

Define a type for the work function prototype. It's not only kept in the
work_struct struct, it's also passed as an argument to several functions.

This makes it easier to change it.

Signed-Off-By: David Howells <[e-mail]>

drivers/block/floppy.c

···
 
 static void schedule_bh(void (*handler) (void))
 {
-	PREPARE_WORK(&floppy_work, (void (*)(void *))handler, NULL);
+	PREPARE_WORK(&floppy_work, (work_func_t)handler, NULL);
 	schedule_work(&floppy_work);
 }
 
···
 
 	spin_lock_irqsave(&floppy_lock, flags);
 	do_floppy = NULL;
-	PREPARE_WORK(&floppy_work, (void *)empty, NULL);
+	PREPARE_WORK(&floppy_work, (work_func_t)empty, NULL);
 	del_timer(&fd_timer);
 	spin_unlock_irqrestore(&floppy_lock, flags);
 }

include/linux/workqueue.h

···
 
 struct workqueue_struct;
 
+typedef void (*work_func_t)(void *data);
+
 struct work_struct {
 	unsigned long pending;
 	struct list_head entry;
-	void (*func)(void *);
+	work_func_t func;
 	void *data;
 	void *wq_data;
 };
···
 extern int FASTCALL(schedule_delayed_work(struct delayed_work *work, unsigned long delay));
 
 extern int schedule_delayed_work_on(int cpu, struct delayed_work *work, unsigned long delay);
-extern int schedule_on_each_cpu(void (*func)(void *info), void *info);
+extern int schedule_on_each_cpu(work_func_t func, void *info);
 extern void flush_scheduled_work(void);
 extern int current_is_keventd(void);
 extern int keventd_up(void);
···
 void cancel_rearming_delayed_work(struct delayed_work *work);
 void cancel_rearming_delayed_workqueue(struct workqueue_struct *,
 				       struct delayed_work *);
-int execute_in_process_context(void (*fn)(void *), void *,
-			       struct execute_work *);
+int execute_in_process_context(work_func_t fn, void *, struct execute_work *);
 
 /*
  * Kill off a pending schedule_delayed_work().  Note that the work callback

kernel/workqueue.c

···
 	while (!list_empty(&cwq->worklist)) {
 		struct work_struct *work = list_entry(cwq->worklist.next,
 						struct work_struct, entry);
-		void (*f) (void *) = work->func;
+		work_func_t f = work->func;
 		void *data = work->data;
 
 		list_del_init(cwq->worklist.next);
···
  *
  * schedule_on_each_cpu() is very slow.
  */
-int schedule_on_each_cpu(void (*func)(void *info), void *info)
+int schedule_on_each_cpu(work_func_t func, void *info)
 {
 	int cpu;
 	struct work_struct *works;
···
  * Returns:	0 - function was executed
  *		1 - function was scheduled for execution
  */
-int execute_in_process_context(void (*fn)(void *data), void *data,
+int execute_in_process_context(work_func_t fn, void *data,
 			       struct execute_work *ew)
 {
 	if (!in_interrupt()) {