kobject: modify kobject_get_path() to take a const *

kobject_get_path() does not modify the kobject passed to it, so make the
pointer constant.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Link: https://lore.kernel.org/r/20221001165315.2690141-1-gregkh@linuxfoundation.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/kobject.h

@@ -115,7 +115,7 @@ extern void kobject_put(struct kobject *kobj);
 extern const void *kobject_namespace(struct kobject *kobj);
 extern void kobject_get_ownership(struct kobject *kobj,
 				  kuid_t *uid, kgid_t *gid);
-extern char *kobject_get_path(struct kobject *kobj, gfp_t flag);
+extern char *kobject_get_path(const struct kobject *kobj, gfp_t flag);
 
 struct kobj_type {
 	void (*release)(struct kobject *kobj);

lib/kobject.c

@@ -94,10 +94,10 @@ static int create_dir(struct kobject *kobj)
 	return 0;
 }
 
-static int get_kobj_path_length(struct kobject *kobj)
+static int get_kobj_path_length(const struct kobject *kobj)
 {
 	int length = 1;
-	struct kobject *parent = kobj;
+	const struct kobject *parent = kobj;
 
 	/* walk up the ancestors until we hit the one pointing to the
 	 * root.
@@ -112,9 +112,9 @@ static int get_kobj_path_length(struct kobject *kobj)
 	return length;
 }
 
-static void fill_kobj_path(struct kobject *kobj, char *path, int length)
+static void fill_kobj_path(const struct kobject *kobj, char *path, int length)
 {
-	struct kobject *parent;
+	const struct kobject *parent;
 
 	--length;
 	for (parent = kobj; parent; parent = parent->parent) {
@@ -136,7 +136,7 @@ static void fill_kobj_path(struct kobject *kobj, char *path, int length)
  *
  * Return: The newly allocated memory, caller must free with kfree().
  */
-char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask)
+char *kobject_get_path(const struct kobject *kobj, gfp_t gfp_mask)
 {
 	char *path;
 	int len;