Merge tag 'driver-core-6.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core updates from Greg KH:
 "Here is the large set of driver core changes for 6.4-rc1.

  Once again, a busy development cycle, with lots of changes happening
  in the driver core in the quest to be able to move "struct bus" and
  "struct class" into read-only memory, a task now complete with these
  changes.

  This will make the future rust interactions with the driver core more
  "provably correct" as well as providing more obvious lifetime rules
  for all busses and classes in the kernel.

  The changes required for this did touch many individual classes and
  busses as many callbacks were changed to take const * parameters
  instead. All of these changes have been submitted to the various
  subsystem maintainers, giving them plenty of time to review, and most
  of them actually did so.

  Other than those changes, included in here are a small set of other
  things:

   - kobject logging improvements

   - cacheinfo improvements and updates

   - obligatory fw_devlink updates and fixes

   - documentation updates

   - device property cleanups and const * changes

   - firwmare loader dependency fixes.

  All of these have been in linux-next for a while with no reported
  problems"

* tag 'driver-core-6.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (120 commits)
  device property: make device_property functions take const device *
  driver core: update comments in device_rename()
  driver core: Don't require dynamic_debug for initcall_debug probe timing
  firmware_loader: rework crypto dependencies
  firmware_loader: Strip off \n from customized path
  zram: fix up permission for the hot_add sysfs file
  cacheinfo: Add use_arch[|_cache]_info field/function
  arch_topology: Remove early cacheinfo error message if -ENOENT
  cacheinfo: Check cache properties are present in DT
  cacheinfo: Check sib_leaf in cache_leaves_are_shared()
  cacheinfo: Allow early level detection when DT/ACPI info is missing/broken
  cacheinfo: Add arm64 early level initializer implementation
  cacheinfo: Add arch specific early level initializer
  tty: make tty_class a static const structure
  driver core: class: remove struct class_interface * from callbacks
  driver core: class: mark the struct class in struct class_interface constant
  driver core: class: make class_register() take a const *
  driver core: class: mark class_release() as taking a const *
  driver core: remove incorrect comment for device_create*
  MIPS: vpe-cmp: remove module owner pointer from struct class usage.
  ...

10 files changed, 139 insertions, 198 deletions

diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
index 908e19d17f49..a5cfd44fab45 100644
--- a/include/linux/cacheinfo.h
+++ b/include/linux/cacheinfo.h
@@ -76,9 +76,11 @@ struct cpu_cacheinfo {
 	unsigned int num_levels;
 	unsigned int num_leaves;
 	bool cpu_map_populated;
+	bool early_ci_levels;
 };
 
 struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu);
+int early_cache_level(unsigned int cpu);
 int init_cache_level(unsigned int cpu);
 int init_of_cache_level(unsigned int cpu);
 int populate_cache_leaves(unsigned int cpu);
@@ -129,4 +131,10 @@ static inline int get_cpu_cacheinfo_id(int cpu, int level)
 	return -1;
 }
 
+#ifdef CONFIG_ARM64
+#define use_arch_cache_info()	(true)
+#else
+#define use_arch_cache_info()	(false)
+#endif
+
 #endif /* _LINUX_CACHEINFO_H */
diff --git a/include/linux/device.h b/include/linux/device.h
index 1508e637bb26..472dd24d4823 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -243,21 +243,26 @@ void __iomem *devm_of_iomap(struct device *dev,
 			    resource_size_t *size);
 
 /* allows to add/remove a custom action to devres stack */
-int devm_add_action(struct device *dev, void (*action)(void *), void *data);
 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
 void devm_release_action(struct device *dev, void (*action)(void *), void *data);
 
-static inline int devm_add_action_or_reset(struct device *dev,
-					   void (*action)(void *), void *data)
+int __devm_add_action(struct device *dev, void (*action)(void *), void *data, const char *name);
+#define devm_add_action(release, action, data) \
+	__devm_add_action(release, action, data, #action)
+
+static inline int __devm_add_action_or_reset(struct device *dev, void (*action)(void *),
+					     void *data, const char *name)
 {
 	int ret;
 
-	ret = devm_add_action(dev, action, data);
+	ret = __devm_add_action(dev, action, data, name);
 	if (ret)
 		action(data);
 
 	return ret;
 }
+#define devm_add_action_or_reset(release, action, data) \
+	__devm_add_action_or_reset(release, action, data, #action)
 
 /**
  * devm_alloc_percpu - Resource-managed alloc_percpu
@@ -561,7 +566,7 @@ struct device {
 	const char		*init_name; /* initial name of the device */
 	const struct device_type *type;
 
-	struct bus_type	*bus;		/* type of bus device is on */
+	const struct bus_type	*bus;	/* type of bus device is on */
 	struct device_driver *driver;	/* which driver has allocated this
 					   device */
 	void		*platform_data;	/* Platform specific data, device
@@ -626,7 +631,7 @@ struct device {
 	spinlock_t		devres_lock;
 	struct list_head	devres_head;
 
-	struct class		*class;
+	const struct class	*class;
 	const struct attribute_group **groups;	/* optional groups */
 
 	void	(*release)(struct device *dev);
@@ -1010,13 +1015,13 @@ bool device_is_bound(struct device *dev);
  * Easy functions for dynamically creating devices on the fly
  */
 __printf(5, 6) struct device *
-device_create(struct class *cls, struct device *parent, dev_t devt,
+device_create(const struct class *cls, struct device *parent, dev_t devt,
 	      void *drvdata, const char *fmt, ...);
 __printf(6, 7) struct device *
-device_create_with_groups(struct class *cls, struct device *parent, dev_t devt,
+device_create_with_groups(const struct class *cls, struct device *parent, dev_t devt,
 			  void *drvdata, const struct attribute_group **groups,
 			  const char *fmt, ...);
-void device_destroy(struct class *cls, dev_t devt);
+void device_destroy(const struct class *cls, dev_t devt);
 
 int __must_check device_add_groups(struct device *dev,
 				   const struct attribute_group **groups);
@@ -1083,8 +1088,7 @@ void device_link_remove(void *consumer, struct device *supplier);
 void device_links_supplier_sync_state_pause(void);
 void device_links_supplier_sync_state_resume(void);
 
-extern __printf(3, 4)
-int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
+__printf(3, 4) int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
 
 /* Create alias, so I can be autoloaded. */
 #define MODULE_ALIAS_CHARDEV(major,minor) \
@@ -1092,10 +1096,4 @@ int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 	MODULE_ALIAS("char-major-" __stringify(major) "-*")
 
-#ifdef CONFIG_SYSFS_DEPRECATED
-extern long sysfs_deprecated;
-#else
-#define sysfs_deprecated 0
-#endif
-
 #endif /* _DEVICE_H_ */
diff --git a/include/linux/device/bus.h b/include/linux/device/bus.h
index 6ce32ef4b8fd..ae10c4322754 100644
--- a/include/linux/device/bus.h
+++ b/include/linux/device/bus.h
@@ -26,7 +26,6 @@ struct fwnode_handle;
  *
  * @name:	The name of the bus.
  * @dev_name:	Used for subsystems to enumerate devices like ("foo%u", dev->id).
- * @dev_root:	Default device to use as the parent.
  * @bus_groups:	Default attributes of the bus.
  * @dev_groups:	Default attributes of the devices on the bus.
  * @drv_groups: Default attributes of the device drivers on the bus.
@@ -66,7 +65,6 @@ struct fwnode_handle;
  * @iommu_ops:  IOMMU specific operations for this bus, used to attach IOMMU
  *              driver implementations to a bus and allow the driver to do
  *              bus-specific setup
- * @lock_key:	Lock class key for use by the lock validator
  * @need_parent_lock:	When probing or removing a device on this bus, the
  *			device core should lock the device's parent.
  *
@@ -82,7 +80,6 @@ struct fwnode_handle;
 struct bus_type {
 	const char		*name;
 	const char		*dev_name;
-	struct device		*dev_root;
 	const struct attribute_group **bus_groups;
 	const struct attribute_group **dev_groups;
 	const struct attribute_group **drv_groups;
@@ -112,16 +109,16 @@ struct bus_type {
 	bool need_parent_lock;
 };
 
-extern int __must_check bus_register(struct bus_type *bus);
+int __must_check bus_register(const struct bus_type *bus);
 
-extern void bus_unregister(const struct bus_type *bus);
+void bus_unregister(const struct bus_type *bus);
 
-extern int __must_check bus_rescan_devices(struct bus_type *bus);
+int __must_check bus_rescan_devices(const struct bus_type *bus);
 
 struct bus_attribute {
 	struct attribute	attr;
-	ssize_t (*show)(struct bus_type *bus, char *buf);
-	ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
+	ssize_t (*show)(const struct bus_type *bus, char *buf);
+	ssize_t (*store)(const struct bus_type *bus, const char *buf, size_t count);
 };
 
 #define BUS_ATTR_RW(_name) \
@@ -246,10 +243,8 @@ void bus_sort_breadthfirst(struct bus_type *bus,
  */
 struct notifier_block;
 
-extern int bus_register_notifier(const struct bus_type *bus,
-				 struct notifier_block *nb);
-extern int bus_unregister_notifier(const struct bus_type *bus,
-				   struct notifier_block *nb);
+int bus_register_notifier(const struct bus_type *bus, struct notifier_block *nb);
+int bus_unregister_notifier(const struct bus_type *bus, struct notifier_block *nb);
 
 /**
  * enum bus_notifier_event - Bus Notifier events that have happened
@@ -281,7 +276,7 @@ enum bus_notifier_event {
 	BUS_NOTIFY_DRIVER_NOT_BOUND,
 };
 
-extern struct kset *bus_get_kset(const struct bus_type *bus);
+struct kset *bus_get_kset(const struct bus_type *bus);
 struct device *bus_get_dev_root(const struct bus_type *bus);
 
 #endif
diff --git a/include/linux/device/class.h b/include/linux/device/class.h
index 42cc3fb44a84..9deeaeb457bb 100644
--- a/include/linux/device/class.h
+++ b/include/linux/device/class.h
@@ -25,10 +25,8 @@ struct fwnode_handle;
 /**
  * struct class - device classes
  * @name:	Name of the class.
- * @owner:	The module owner.
  * @class_groups: Default attributes of this class.
  * @dev_groups:	Default attributes of the devices that belong to the class.
- * @dev_kobj:	The kobject that represents this class and links it into the hierarchy.
  * @dev_uevent:	Called when a device is added, removed from this class, or a
  *		few other things that generate uevents to add the environment
  *		variables.
@@ -53,16 +51,14 @@ struct fwnode_handle;
  */
 struct class {
 	const char		*name;
-	struct module		*owner;
 
 	const struct attribute_group	**class_groups;
 	const struct attribute_group	**dev_groups;
-	struct kobject			*dev_kobj;
 
 	int (*dev_uevent)(const struct device *dev, struct kobj_uevent_env *env);
 	char *(*devnode)(const struct device *dev, umode_t *mode);
 
-	void (*class_release)(struct class *class);
+	void (*class_release)(const struct class *class);
 	void (*dev_release)(struct device *dev);
 
 	int (*shutdown_pre)(struct device *dev);
@@ -73,8 +69,6 @@ struct class {
 	void (*get_ownership)(const struct device *dev, kuid_t *uid, kgid_t *gid);
 
 	const struct dev_pm_ops *pm;
-
-	struct subsys_private *p;
 };
 
 struct class_dev_iter {
@@ -82,19 +76,9 @@ struct class_dev_iter {
 	const struct device_type	*type;
 };
 
-extern struct kobject *sysfs_dev_block_kobj;
-extern struct kobject *sysfs_dev_char_kobj;
-extern int __must_check __class_register(struct class *class,
-					 struct lock_class_key *key);
-extern void class_unregister(struct class *class);
-
-/* This is a #define to keep the compiler from merging different
- * instances of the __key variable */
-#define class_register(class)			\
-({						\
-	static struct lock_class_key __key;	\
-	__class_register(class, &__key);	\
-})
+int __must_check class_register(const struct class *class);
+void class_unregister(const struct class *class);
+bool class_is_registered(const struct class *class);
 
 struct class_compat;
 struct class_compat *class_compat_register(const char *name);
@@ -104,19 +88,15 @@ int class_compat_create_link(struct class_compat *cls, struct device *dev,
 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
 			      struct device *device_link);
 
-extern void class_dev_iter_init(struct class_dev_iter *iter,
-				struct class *class,
-				struct device *start,
-				const struct device_type *type);
-extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
-extern void class_dev_iter_exit(struct class_dev_iter *iter);
+void class_dev_iter_init(struct class_dev_iter *iter, const struct class *class,
+			 const struct device *start, const struct device_type *type);
+struct device *class_dev_iter_next(struct class_dev_iter *iter);
+void class_dev_iter_exit(struct class_dev_iter *iter);
 
-extern int class_for_each_device(struct class *class, struct device *start,
-				 void *data,
-				 int (*fn)(struct device *dev, void *data));
-extern struct device *class_find_device(struct class *class,
-					struct device *start, const void *data,
-					int (*match)(struct device *, const void *));
+int class_for_each_device(const struct class *class, const struct device *start, void *data,
+			  int (*fn)(struct device *dev, void *data));
+struct device *class_find_device(const struct class *class, const struct device *start,
+				 const void *data, int (*match)(struct device *, const void *));
 
 /**
  * class_find_device_by_name - device iterator for locating a particular device
@@ -124,7 +104,7 @@ extern struct device *class_find_device(struct class *class,
  * @class: class type
  * @name: name of the device to match
  */
-static inline struct device *class_find_device_by_name(struct class *class,
+static inline struct device *class_find_device_by_name(const struct class *class,
 						       const char *name)
 {
 	return class_find_device(class, NULL, name, device_match_name);
@@ -136,8 +116,8 @@ static inline struct device *class_find_device_by_name(struct class *class,
  * @class: class type
  * @np: of_node of the device to match.
  */
-static inline struct device *
-class_find_device_by_of_node(struct class *class, const struct device_node *np)
+static inline struct device *class_find_device_by_of_node(const struct class *class,
+							  const struct device_node *np)
 {
 	return class_find_device(class, NULL, np, device_match_of_node);
 }
@@ -148,9 +128,8 @@ class_find_device_by_of_node(struct class *class, const struct device_node *np)
  * @class: class type
  * @fwnode: fwnode of the device to match.
  */
-static inline struct device *
-class_find_device_by_fwnode(struct class *class,
-			    const struct fwnode_handle *fwnode)
+static inline struct device *class_find_device_by_fwnode(const struct class *class,
+							 const struct fwnode_handle *fwnode)
 {
 	return class_find_device(class, NULL, fwnode, device_match_fwnode);
 }
@@ -161,7 +140,7 @@ class_find_device_by_fwnode(struct class *class,
  * @class: class type
  * @devt: device type of the device to match.
  */
-static inline struct device *class_find_device_by_devt(struct class *class,
+static inline struct device *class_find_device_by_devt(const struct class *class,
 						       dev_t devt)
 {
 	return class_find_device(class, NULL, &devt, device_match_devt);
@@ -175,14 +154,14 @@ struct acpi_device;
  * @class: class type
  * @adev: ACPI_COMPANION device to match.
  */
-static inline struct device *
-class_find_device_by_acpi_dev(struct class *class, const struct acpi_device *adev)
+static inline struct device *class_find_device_by_acpi_dev(const struct class *class,
+							   const struct acpi_device *adev)
 {
 	return class_find_device(class, NULL, adev, device_match_acpi_dev);
 }
 #else
-static inline struct device *
-class_find_device_by_acpi_dev(struct class *class, const void *adev)
+static inline struct device *class_find_device_by_acpi_dev(const struct class *class,
+							   const void *adev)
 {
 	return NULL;
 }
@@ -190,10 +169,10 @@ class_find_device_by_acpi_dev(struct class *class, const void *adev)
 
 struct class_attribute {
 	struct attribute attr;
-	ssize_t (*show)(struct class *class, struct class_attribute *attr,
+	ssize_t (*show)(const struct class *class, const struct class_attribute *attr,
 			char *buf);
-	ssize_t (*store)(struct class *class, struct class_attribute *attr,
-			const char *buf, size_t count);
+	ssize_t (*store)(const struct class *class, const struct class_attribute *attr,
+			 const char *buf, size_t count);
 };
 
 #define CLASS_ATTR_RW(_name) \
@@ -203,20 +182,18 @@ struct class_attribute {
 #define CLASS_ATTR_WO(_name) \
 	struct class_attribute class_attr_##_name = __ATTR_WO(_name)
 
-extern int __must_check class_create_file_ns(struct class *class,
-					     const struct class_attribute *attr,
-					     const void *ns);
-extern void class_remove_file_ns(struct class *class,
-				 const struct class_attribute *attr,
-				 const void *ns);
+int __must_check class_create_file_ns(const struct class *class, const struct class_attribute *attr,
+				      const void *ns);
+void class_remove_file_ns(const struct class *class, const struct class_attribute *attr,
+			  const void *ns);
 
-static inline int __must_check class_create_file(struct class *class,
-					const struct class_attribute *attr)
+static inline int __must_check class_create_file(const struct class *class,
+						 const struct class_attribute *attr)
 {
 	return class_create_file_ns(class, attr, NULL);
 }
 
-static inline void class_remove_file(struct class *class,
+static inline void class_remove_file(const struct class *class,
 				     const struct class_attribute *attr)
 {
 	return class_remove_file_ns(class, attr, NULL);
@@ -235,46 +212,21 @@ struct class_attribute_string {
 	struct class_attribute_string class_attr_##_name = \
 		_CLASS_ATTR_STRING(_name, _mode, _str)
 
-extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
-                        char *buf);
+ssize_t show_class_attr_string(const struct class *class, const struct class_attribute *attr,
+			       char *buf);
 
 struct class_interface {
 	struct list_head	node;
-	struct class		*class;
+	const struct class	*class;
 
-	int (*add_dev)		(struct device *, struct class_interface *);
-	void (*remove_dev)	(struct device *, struct class_interface *);
+	int (*add_dev)		(struct device *dev);
+	void (*remove_dev)	(struct device *dev);
 };
 
-extern int __must_check class_interface_register(struct class_interface *);
-extern void class_interface_unregister(struct class_interface *);
-
-extern struct class * __must_check __class_create(struct module *owner,
-						  const char *name,
-						  struct lock_class_key *key);
-extern void class_destroy(struct class *cls);
-
-/* This is a #define to keep the compiler from merging different
- * instances of the __key variable */
-
-/**
- * class_create - create a struct class structure
- * @owner: pointer to the module that is to "own" this struct class
- * @name: pointer to a string for the name of this class.
- *
- * This is used to create a struct class pointer that can then be used
- * in calls to device_create().
- *
- * Returns &struct class pointer on success, or ERR_PTR() on error.
- *
- * Note, the pointer created here is to be destroyed when finished by
- * making a call to class_destroy().
- */
-#define class_create(owner, name)		\
-({						\
-	static struct lock_class_key __key;	\
-	__class_create(owner, name, &__key);	\
-})
+int __must_check class_interface_register(struct class_interface *);
+void class_interface_unregister(struct class_interface *);
 
+struct class * __must_check class_create(const char *name);
+void class_destroy(const struct class *cls);
 
 #endif	/* _DEVICE_CLASS_H_ */
diff --git a/include/linux/device/driver.h b/include/linux/device/driver.h
index 50d0a416a5e7..c244267a6744 100644
--- a/include/linux/device/driver.h
+++ b/include/linux/device/driver.h
@@ -95,7 +95,7 @@ enum probe_type {
  */
 struct device_driver {
 	const char		*name;
-	struct bus_type		*bus;
+	const struct bus_type	*bus;
 
 	struct module		*owner;
 	const char		*mod_name;	/* used for built-in modules */
@@ -122,13 +122,12 @@ struct device_driver {
 };
 
 
-extern int __must_check driver_register(struct device_driver *drv);
-extern void driver_unregister(struct device_driver *drv);
+int __must_check driver_register(struct device_driver *drv);
+void driver_unregister(struct device_driver *drv);
 
-extern struct device_driver *driver_find(const char *name,
-					 struct bus_type *bus);
-extern int driver_probe_done(void);
-extern void wait_for_device_probe(void);
+struct device_driver *driver_find(const char *name, const struct bus_type *bus);
+int driver_probe_done(void);
+void wait_for_device_probe(void);
 void __init wait_for_init_devices_probe(void);
 
 /* sysfs interface for exporting driver attributes */
@@ -147,18 +146,15 @@ struct driver_attribute {
 #define DRIVER_ATTR_WO(_name) \
 	struct driver_attribute driver_attr_##_name = __ATTR_WO(_name)
 
-extern int __must_check driver_create_file(struct device_driver *driver,
-					const struct driver_attribute *attr);
-extern void driver_remove_file(struct device_driver *driver,
-			       const struct driver_attribute *attr);
+int __must_check driver_create_file(struct device_driver *driver,
+				    const struct driver_attribute *attr);
+void driver_remove_file(struct device_driver *driver,
+			const struct driver_attribute *attr);
 
 int driver_set_override(struct device *dev, const char **override,
 			const char *s, size_t len);
-extern int __must_check driver_for_each_device(struct device_driver *drv,
-					       struct device *start,
-					       void *data,
-					       int (*fn)(struct device *dev,
-							 void *));
+int __must_check driver_for_each_device(struct device_driver *drv, struct device *start,
+					void *data, int (*fn)(struct device *dev, void *));
 struct device *driver_find_device(struct device_driver *drv,
 				  struct device *start, const void *data,
 				  int (*match)(struct device *dev, const void *data));
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 6595454d4f48..0fd4e6734d5b 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -455,11 +455,11 @@ static inline const struct iommu_ops *dev_iommu_ops(struct device *dev)
 	return dev->iommu->iommu_dev->ops;
 }
 
-extern int bus_iommu_probe(struct bus_type *bus);
-extern bool iommu_present(struct bus_type *bus);
+extern int bus_iommu_probe(const struct bus_type *bus);
+extern bool iommu_present(const struct bus_type *bus);
 extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap);
 extern bool iommu_group_has_isolated_msi(struct iommu_group *group);
-extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
+extern struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus);
 extern struct iommu_group *iommu_group_get_by_id(int id);
 extern void iommu_domain_free(struct iommu_domain *domain);
 extern int iommu_attach_device(struct iommu_domain *domain,
@@ -732,7 +732,7 @@ struct iommu_device {};
 struct iommu_fault_param {};
 struct iommu_iotlb_gather {};
 
-static inline bool iommu_present(struct bus_type *bus)
+static inline bool iommu_present(const struct bus_type *bus)
 {
 	return false;
 }
@@ -742,7 +742,7 @@ static inline bool device_iommu_capable(struct device *dev, enum iommu_cap cap)
 	return false;
 }
 
-static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
+static inline struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
 {
 	return NULL;
 }
diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index bdab370a24f4..c392c811d9ad 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -79,43 +79,37 @@ struct kobject {
 	unsigned int uevent_suppress:1;
 };
 
-extern __printf(2, 3)
-int kobject_set_name(struct kobject *kobj, const char *name, ...);
-extern __printf(2, 0)
-int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
-			   va_list vargs);
+__printf(2, 3) int kobject_set_name(struct kobject *kobj, const char *name, ...);
+__printf(2, 0) int kobject_set_name_vargs(struct kobject *kobj, const char *fmt, va_list vargs);
 
 static inline const char *kobject_name(const struct kobject *kobj)
 {
 	return kobj->name;
 }
 
-extern void kobject_init(struct kobject *kobj, const struct kobj_type *ktype);
-extern __printf(3, 4) __must_check
-int kobject_add(struct kobject *kobj, struct kobject *parent,
-		const char *fmt, ...);
-extern __printf(4, 5) __must_check
-int kobject_init_and_add(struct kobject *kobj,
-			 const struct kobj_type *ktype, struct kobject *parent,
-			 const char *fmt, ...);
+void kobject_init(struct kobject *kobj, const struct kobj_type *ktype);
+__printf(3, 4) __must_check int kobject_add(struct kobject *kobj,
+					    struct kobject *parent,
+					    const char *fmt, ...);
+__printf(4, 5) __must_check int kobject_init_and_add(struct kobject *kobj,
+						     const struct kobj_type *ktype,
+						     struct kobject *parent,
+						     const char *fmt, ...);
 
-extern void kobject_del(struct kobject *kobj);
+void kobject_del(struct kobject *kobj);
 
-extern struct kobject * __must_check kobject_create_and_add(const char *name,
-						struct kobject *parent);
+struct kobject * __must_check kobject_create_and_add(const char *name, struct kobject *parent);
 
-extern int __must_check kobject_rename(struct kobject *, const char *new_name);
-extern int __must_check kobject_move(struct kobject *, struct kobject *);
+int __must_check kobject_rename(struct kobject *, const char *new_name);
+int __must_check kobject_move(struct kobject *, struct kobject *);
 
-extern struct kobject *kobject_get(struct kobject *kobj);
-extern struct kobject * __must_check kobject_get_unless_zero(
-						struct kobject *kobj);
-extern void kobject_put(struct kobject *kobj);
+struct kobject *kobject_get(struct kobject *kobj);
+struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj);
+void kobject_put(struct kobject *kobj);
 
-extern const void *kobject_namespace(const struct kobject *kobj);
-extern void kobject_get_ownership(const struct kobject *kobj,
-				  kuid_t *uid, kgid_t *gid);
-extern char *kobject_get_path(const struct kobject *kobj, gfp_t flag);
+const void *kobject_namespace(const struct kobject *kobj);
+void kobject_get_ownership(const struct kobject *kobj, kuid_t *uid, kgid_t *gid);
+char *kobject_get_path(const struct kobject *kobj, gfp_t flag);
 
 struct kobj_type {
 	void (*release)(struct kobject *kobj);
@@ -176,12 +170,11 @@ struct kset {
 	const struct kset_uevent_ops *uevent_ops;
 } __randomize_layout;
 
-extern void kset_init(struct kset *kset);
-extern int __must_check kset_register(struct kset *kset);
-extern void kset_unregister(struct kset *kset);
-extern struct kset * __must_check kset_create_and_add(const char *name,
-						const struct kset_uevent_ops *u,
-						struct kobject *parent_kobj);
+void kset_init(struct kset *kset);
+int __must_check kset_register(struct kset *kset);
+void kset_unregister(struct kset *kset);
+struct kset * __must_check kset_create_and_add(const char *name, const struct kset_uevent_ops *u,
+					       struct kobject *parent_kobj);
 
 static inline struct kset *to_kset(struct kobject *kobj)
 {
@@ -203,7 +196,7 @@ static inline const struct kobj_type *get_ktype(const struct kobject *kobj)
 	return kobj->ktype;
 }
 
-extern struct kobject *kset_find_obj(struct kset *, const char *);
+struct kobject *kset_find_obj(struct kset *, const char *);
 
 /* The global /sys/kernel/ kobject for people to chain off of */
 extern struct kobject *kernel_kobj;
diff --git a/include/linux/property.h b/include/linux/property.h
index 0a29db15ff34..66df1a15d518 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -16,7 +16,6 @@
 #include <linux/types.h>
 
 struct device;
-struct net_device;
 
 enum dev_prop_type {
 	DEV_PROP_U8,
@@ -40,20 +39,20 @@ struct fwnode_handle *__dev_fwnode(struct device *dev);
 		 const struct device *: __dev_fwnode_const,	\
 		 struct device *: __dev_fwnode)(dev)
 
-bool device_property_present(struct device *dev, const char *propname);
-int device_property_read_u8_array(struct device *dev, const char *propname,
+bool device_property_present(const struct device *dev, const char *propname);
+int device_property_read_u8_array(const struct device *dev, const char *propname,
 				  u8 *val, size_t nval);
-int device_property_read_u16_array(struct device *dev, const char *propname,
+int device_property_read_u16_array(const struct device *dev, const char *propname,
 				   u16 *val, size_t nval);
-int device_property_read_u32_array(struct device *dev, const char *propname,
+int device_property_read_u32_array(const struct device *dev, const char *propname,
 				   u32 *val, size_t nval);
-int device_property_read_u64_array(struct device *dev, const char *propname,
+int device_property_read_u64_array(const struct device *dev, const char *propname,
 				   u64 *val, size_t nval);
-int device_property_read_string_array(struct device *dev, const char *propname,
+int device_property_read_string_array(const struct device *dev, const char *propname,
 				      const char **val, size_t nval);
-int device_property_read_string(struct device *dev, const char *propname,
+int device_property_read_string(const struct device *dev, const char *propname,
 				const char **val);
-int device_property_match_string(struct device *dev,
+int device_property_match_string(const struct device *dev,
 				 const char *propname, const char *string);
 
 bool fwnode_property_present(const struct fwnode_handle *fwnode,
@@ -105,11 +104,11 @@ struct fwnode_handle *fwnode_get_next_parent(struct fwnode_handle *fwnode);
 	for (parent = fwnode_get_parent(fwnode); parent;	\
 	     parent = fwnode_get_next_parent(parent))
 
-struct device *fwnode_get_next_parent_dev(struct fwnode_handle *fwnode);
+struct device *fwnode_get_next_parent_dev(const struct fwnode_handle *fwnode);
 unsigned int fwnode_count_parents(const struct fwnode_handle *fwn);
 struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwn,
 					    unsigned int depth);
-bool fwnode_is_ancestor_of(struct fwnode_handle *ancestor, struct fwnode_handle *child);
+bool fwnode_is_ancestor_of(const struct fwnode_handle *ancestor, const struct fwnode_handle *child);
 struct fwnode_handle *fwnode_get_next_child_node(
 	const struct fwnode_handle *fwnode, struct fwnode_handle *child);
 struct fwnode_handle *fwnode_get_next_available_child_node(
@@ -143,57 +142,57 @@ int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name);
 
 unsigned int device_get_child_node_count(const struct device *dev);
 
-static inline bool device_property_read_bool(struct device *dev,
+static inline bool device_property_read_bool(const struct device *dev,
 					     const char *propname)
 {
 	return device_property_present(dev, propname);
 }
 
-static inline int device_property_read_u8(struct device *dev,
+static inline int device_property_read_u8(const struct device *dev,
 					  const char *propname, u8 *val)
 {
 	return device_property_read_u8_array(dev, propname, val, 1);
 }
 
-static inline int device_property_read_u16(struct device *dev,
+static inline int device_property_read_u16(const struct device *dev,
 					   const char *propname, u16 *val)
 {
 	return device_property_read_u16_array(dev, propname, val, 1);
 }
 
-static inline int device_property_read_u32(struct device *dev,
+static inline int device_property_read_u32(const struct device *dev,
 					   const char *propname, u32 *val)
 {
 	return device_property_read_u32_array(dev, propname, val, 1);
 }
 
-static inline int device_property_read_u64(struct device *dev,
+static inline int device_property_read_u64(const struct device *dev,
 					   const char *propname, u64 *val)
 {
 	return device_property_read_u64_array(dev, propname, val, 1);
 }
 
-static inline int device_property_count_u8(struct device *dev, const char *propname)
+static inline int device_property_count_u8(const struct device *dev, const char *propname)
 {
 	return device_property_read_u8_array(dev, propname, NULL, 0);
 }
 
-static inline int device_property_count_u16(struct device *dev, const char *propname)
+static inline int device_property_count_u16(const struct device *dev, const char *propname)
 {
 	return device_property_read_u16_array(dev, propname, NULL, 0);
 }
 
-static inline int device_property_count_u32(struct device *dev, const char *propname)
+static inline int device_property_count_u32(const struct device *dev, const char *propname)
 {
 	return device_property_read_u32_array(dev, propname, NULL, 0);
 }
 
-static inline int device_property_count_u64(struct device *dev, const char *propname)
+static inline int device_property_count_u64(const struct device *dev, const char *propname)
 {
 	return device_property_read_u64_array(dev, propname, NULL, 0);
 }
 
-static inline int device_property_string_array_count(struct device *dev,
+static inline int device_property_string_array_count(const struct device *dev,
 						     const char *propname)
 {
 	return device_property_read_string_array(dev, propname, NULL, 0);
@@ -396,7 +395,7 @@ enum dev_dma_attr device_get_dma_attr(const struct device *dev);
 const void *device_get_match_data(const struct device *dev);
 
 int device_get_phy_mode(struct device *dev);
-int fwnode_get_phy_mode(struct fwnode_handle *fwnode);
+int fwnode_get_phy_mode(const struct fwnode_handle *fwnode);
 
 void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index);
 
@@ -433,7 +432,7 @@ static inline bool fwnode_graph_is_endpoint(const struct fwnode_handle *fwnode)
 struct fwnode_handle *
 fwnode_graph_get_endpoint_by_id(const struct fwnode_handle *fwnode,
 				u32 port, u32 endpoint, unsigned long flags);
-unsigned int fwnode_graph_get_endpoint_count(struct fwnode_handle *fwnode,
+unsigned int fwnode_graph_get_endpoint_count(const struct fwnode_handle *fwnode,
 					     unsigned long flags);
 
 #define fwnode_graph_for_each_endpoint(fwnode, child)				\
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 60871a9d3212..e8d5d9997aca 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -387,7 +387,7 @@ extern struct ktermios tty_std_termios;
 
 int vcs_init(void);
 
-extern struct class *tty_class;
+extern const struct class tty_class;
 
 /**
  *	tty_kref_get		-	get a tty reference
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index f7bfedb740f5..7eeb5f9c4f0d 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -378,7 +378,7 @@ void usb_serial_handle_dcd_change(struct usb_serial_port *usb_port,
 int usb_serial_bus_register(struct usb_serial_driver *device);
 void usb_serial_bus_deregister(struct usb_serial_driver *device);
 
-extern struct bus_type usb_serial_bus_type;
+extern const struct bus_type usb_serial_bus_type;
 extern struct tty_driver *usb_serial_tty_driver;
 
 static inline void usb_serial_debug_data(struct device *dev,