The class_create() call has been deprecated in favor of class_register()
as the driver core now allows for a struct class to be in read-only
memory. Change devfreq_event_class to be a const struct class and drop
the class_create() call. Compile tested.

Link: https://lore.kernel.org/all/2023040244-duffel-pushpin-f738@gregkh/

Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jori Koolstra <jkoolstra@xs4all.nl>
---
 drivers/devfreq/devfreq-event.c | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/devfreq/devfreq-event.c b/drivers/devfreq/devfreq-event.c
index 179de3cf6d6c..9e183cd8818c 100644
--- a/drivers/devfreq/devfreq-event.c
+++ b/drivers/devfreq/devfreq-event.c
@@ -17,7 +17,13 @@
 #include <linux/list.h>
 #include <linux/of.h>
 
-static struct class *devfreq_event_class;
+static struct attribute *devfreq_event_attrs[];
+ATTRIBUTE_GROUPS(devfreq_event);
+
+static const struct class devfreq_event_class = {
+	.name		= "devfreq-event",
+	.dev_groups	= devfreq_event_groups
+};
 
 /* The list of all devfreq event list */
 static LIST_HEAD(devfreq_event_list);
@@ -321,7 +327,7 @@ struct devfreq_event_dev *devfreq_event_add_edev(struct device *dev,
 	edev->desc = desc;
 	edev->enable_count = 0;
 	edev->dev.parent = dev;
-	edev->dev.class = devfreq_event_class;
+	edev->dev.class = &devfreq_event_class;
 	edev->dev.release = devfreq_event_release_edev;
 
 	dev_set_name(&edev->dev, "event%d", atomic_inc_return(&event_no));
@@ -461,18 +467,15 @@ static struct attribute *devfreq_event_attrs[] = {
 	&dev_attr_enable_count.attr,
 	NULL,
 };
-ATTRIBUTE_GROUPS(devfreq_event);
 
 static int __init devfreq_event_init(void)
 {
-	devfreq_event_class = class_create("devfreq-event");
-	if (IS_ERR(devfreq_event_class)) {
-		pr_err("%s: couldn't create class\n", __FILE__);
-		return PTR_ERR(devfreq_event_class);
-	}
+	int err;
 
-	devfreq_event_class->dev_groups = devfreq_event_groups;
+	err = class_register(&devfreq_event_class);
+	if (err)
+		pr_err("%s: couldn't create class\n", __FILE__);
 
-	return 0;
+	return err;
 }
 subsys_initcall(devfreq_event_init);

base-commit: d466c332e106fe666d1e2f5a24d08e308bebbfa1
-- 
2.53.0