rtmutex-tester: convert sysdev_class to a regular subsystem

After all sysdev classes are ported to regular driver core entities, the
sysdev implementation will be entirely removed from the kernel.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

kernel/rtmutex-tester.c

@@ -6,11 +6,11 @@
  *  Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
  *
  */
+#include <linux/device.h>
 #include <linux/kthread.h>
 #include <linux/export.h>
 #include <linux/sched.h>
 #include <linux/spinlock.h>
-#include <linux/sysdev.h>
 #include <linux/timer.h>
 #include <linux/freezer.h>
 
@@ -27,7 +27,7 @@ struct test_thread_data {
 	int			opdata;
 	int			mutexes[MAX_RT_TEST_MUTEXES];
 	int			event;
-	struct sys_device	sysdev;
+	struct device		dev;
 };
 
 static struct test_thread_data thread_data[MAX_RT_TEST_THREADS];
@@ -271,16 +271,16 @@ static int test_func(void *data)
  *
  * opcode:data
  */
-static ssize_t sysfs_test_command(struct sys_device *dev, struct sysdev_attribute *attr,
+static ssize_t sysfs_test_command(struct device *dev, struct device_attribute *attr,
 				  const char *buf, size_t count)
 {
 	struct sched_param schedpar;
 	struct test_thread_data *td;
 	char cmdbuf[32];
 	int op, dat, tid, ret;
 
-	td = container_of(dev, struct test_thread_data, sysdev);
-	tid = td->sysdev.id;
+	td = container_of(dev, struct test_thread_data, dev);
+	tid = td->dev.id;
 
 	/* strings from sysfs write are not 0 terminated! */
 	if (count >= sizeof(cmdbuf))
@@ -334,16 +334,16 @@ static ssize_t sysfs_test_command(struct sys_device *dev, struct sysdev_attribut
  * @dev:	thread to query
  * @buf:	char buffer to be filled with thread status info
  */
-static ssize_t sysfs_test_status(struct sys_device *dev, struct sysdev_attribute *attr,
+static ssize_t sysfs_test_status(struct device *dev, struct device_attribute *attr,
 				 char *buf)
 {
 	struct test_thread_data *td;
 	struct task_struct *tsk;
 	char *curr = buf;
 	int i;
 
-	td = container_of(dev, struct test_thread_data, sysdev);
-	tsk = threads[td->sysdev.id];
+	td = container_of(dev, struct test_thread_data, dev);
+	tsk = threads[td->dev.id];
 
 	spin_lock(&rttest_lock);
 
@@ -360,28 +360,29 @@ static ssize_t sysfs_test_status(struct sys_device *dev, struct sysdev_attribute
 	spin_unlock(&rttest_lock);
 
 	curr += sprintf(curr, ", T: %p, R: %p\n", tsk,
-			mutexes[td->sysdev.id].owner);
+			mutexes[td->dev.id].owner);
 
 	return curr - buf;
 }
 
-static SYSDEV_ATTR(status, 0600, sysfs_test_status, NULL);
-static SYSDEV_ATTR(command, 0600, NULL, sysfs_test_command);
+static DEVICE_ATTR(status, 0600, sysfs_test_status, NULL);
+static DEVICE_ATTR(command, 0600, NULL, sysfs_test_command);
 
-static struct sysdev_class rttest_sysclass = {
+static struct bus_type rttest_subsys = {
 	.name = "rttest",
+	.dev_name = "rttest",
 };
 
 static int init_test_thread(int id)
 {
-	thread_data[id].sysdev.cls = &rttest_sysclass;
-	thread_data[id].sysdev.id = id;
+	thread_data[id].dev.bus = &rttest_subsys;
+	thread_data[id].dev.id = id;
 
 	threads[id] = kthread_run(test_func, &thread_data[id], "rt-test-%d", id);
 	if (IS_ERR(threads[id]))
 		return PTR_ERR(threads[id]);
 
-	return sysdev_register(&thread_data[id].sysdev);
+	return device_register(&thread_data[id].dev);
 }
 
 static int init_rttest(void)
@@ -393,18 +394,18 @@ static int init_rttest(void)
 	for (i = 0; i < MAX_RT_TEST_MUTEXES; i++)
 		rt_mutex_init(&mutexes[i]);
 
-	ret = sysdev_class_register(&rttest_sysclass);
+	ret = subsys_system_register(&rttest_subsys, NULL);
 	if (ret)
 		return ret;
 
 	for (i = 0; i < MAX_RT_TEST_THREADS; i++) {
 		ret = init_test_thread(i);
 		if (ret)
 			break;
-		ret = sysdev_create_file(&thread_data[i].sysdev, &attr_status);
+		ret = device_create_file(&thread_data[i].dev, &dev_attr_status);
 		if (ret)
 			break;
-		ret = sysdev_create_file(&thread_data[i].sysdev, &attr_command);
+		ret = device_create_file(&thread_data[i].dev, &dev_attr_command);
 		if (ret)
 			break;
 	}