diff --git a/include/linux/device.h b/include/linux/device.h
index 15460a5ac024..9cadb647cacc 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -145,68 +145,66 @@ ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
 	struct device_attribute dev_attr_##_name =		\
 		__ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
 
-extern int device_create_file(struct device *device,
-			      const struct device_attribute *entry);
-extern void device_remove_file(struct device *dev,
-			       const struct device_attribute *attr);
-extern bool device_remove_file_self(struct device *dev,
-				    const struct device_attribute *attr);
-extern int __must_check device_create_bin_file(struct device *dev,
+int device_create_file(struct device *device,
+		       const struct device_attribute *entry);
+void device_remove_file(struct device *dev,
+			const struct device_attribute *attr);
+bool device_remove_file_self(struct device *dev,
+			     const struct device_attribute *attr);
+int __must_check device_create_bin_file(struct device *dev,
 					const struct bin_attribute *attr);
-extern void device_remove_bin_file(struct device *dev,
-				   const struct bin_attribute *attr);
+void device_remove_bin_file(struct device *dev,
+			    const struct bin_attribute *attr);
 
 /* device resource management */
 typedef void (*dr_release_t)(struct device *dev, void *res);
 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 
 #ifdef CONFIG_DEBUG_DEVRES
-extern void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
-				 int nid, const char *name) __malloc;
+void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
+			  int nid, const char *name) __malloc;
 #define devres_alloc(release, size, gfp) \
 	__devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
 #define devres_alloc_node(release, size, gfp, nid) \
 	__devres_alloc_node(release, size, gfp, nid, #release)
 #else
-extern void *devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
-			       int nid) __malloc;
+void *devres_alloc_node(dr_release_t release, size_t size,
+			gfp_t gfp, int nid) __malloc;
 static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
 {
 	return devres_alloc_node(release, size, gfp, NUMA_NO_NODE);
 }
 #endif
 
-extern void devres_for_each_res(struct device *dev, dr_release_t release,
-				dr_match_t match, void *match_data,
-				void (*fn)(struct device *, void *, void *),
-				void *data);
-extern void devres_free(void *res);
-extern void devres_add(struct device *dev, void *res);
-extern void *devres_find(struct device *dev, dr_release_t release,
-			 dr_match_t match, void *match_data);
-extern void *devres_get(struct device *dev, void *new_res,
-			dr_match_t match, void *match_data);
-extern void *devres_remove(struct device *dev, dr_release_t release,
-			   dr_match_t match, void *match_data);
-extern int devres_destroy(struct device *dev, dr_release_t release,
-			  dr_match_t match, void *match_data);
-extern int devres_release(struct device *dev, dr_release_t release,
-			  dr_match_t match, void *match_data);
+void devres_for_each_res(struct device *dev, dr_release_t release,
+			 dr_match_t match, void *match_data,
+			 void (*fn)(struct device *, void *, void *),
+			 void *data);
+void devres_free(void *res);
+void devres_add(struct device *dev, void *res);
+void *devres_find(struct device *dev, dr_release_t release,
+		  dr_match_t match, void *match_data);
+void *devres_get(struct device *dev, void *new_res,
+		 dr_match_t match, void *match_data);
+void *devres_remove(struct device *dev, dr_release_t release,
+		    dr_match_t match, void *match_data);
+int devres_destroy(struct device *dev, dr_release_t release,
+		   dr_match_t match, void *match_data);
+int devres_release(struct device *dev, dr_release_t release,
+		   dr_match_t match, void *match_data);
 
 /* devres group */
-extern void * __must_check devres_open_group(struct device *dev, void *id,
-					     gfp_t gfp);
-extern void devres_close_group(struct device *dev, void *id);
-extern void devres_remove_group(struct device *dev, void *id);
-extern int devres_release_group(struct device *dev, void *id);
+void * __must_check devres_open_group(struct device *dev, void *id, gfp_t gfp);
+void devres_close_group(struct device *dev, void *id);
+void devres_remove_group(struct device *dev, void *id);
+int devres_release_group(struct device *dev, void *id);
 
 /* managed devm_k.alloc/kfree for device drivers */
-extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
-extern __printf(3, 0)
-char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt,
-		      va_list ap) __malloc;
-extern __printf(3, 4)
-char *devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...) __malloc;
+void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
+__printf(3, 0) char *devm_kvasprintf(struct device *dev, gfp_t gfp,
+				     const char *fmt, va_list ap) __malloc;
+__printf(3, 4) char *devm_kasprintf(struct device *dev, gfp_t gfp,
+				    const char *fmt, ...) __malloc;
 static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
 {
 	return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
@@ -226,16 +224,14 @@ static inline void *devm_kcalloc(struct device *dev,
 {
 	return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
 }
-extern void devm_kfree(struct device *dev, const void *p);
-extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
-extern const char *devm_kstrdup_const(struct device *dev,
-				      const char *s, gfp_t gfp);
-extern void *devm_kmemdup(struct device *dev, const void *src, size_t len,
-			  gfp_t gfp);
+void devm_kfree(struct device *dev, const void *p);
+char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
+const char *devm_kstrdup_const(struct device *dev, const char *s, gfp_t gfp);
+void *devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp);
 
-extern unsigned long devm_get_free_pages(struct device *dev,
-					 gfp_t gfp_mask, unsigned int order);
-extern void devm_free_pages(struct device *dev, unsigned long addr);
+unsigned long devm_get_free_pages(struct device *dev,
+				  gfp_t gfp_mask, unsigned int order);
+void devm_free_pages(struct device *dev, unsigned long addr);
 
 void __iomem *devm_ioremap_resource(struct device *dev,
 				    const struct resource *res);
@@ -651,8 +647,7 @@ static inline const char *dev_name(const struct device *dev)
 	return kobject_name(&dev->kobj);
 }
 
-extern __printf(2, 3)
-int dev_set_name(struct device *dev, const char *name, ...);
+__printf(2, 3) int dev_set_name(struct device *dev, const char *name, ...);
 
 #ifdef CONFIG_NUMA
 static inline int dev_to_node(struct device *dev)
@@ -809,39 +804,38 @@ static inline bool dev_has_sync_state(struct device *dev)
 /*
  * High level routines for use by the bus drivers
  */
-extern int __must_check device_register(struct device *dev);
-extern void device_unregister(struct device *dev);
-extern void device_initialize(struct device *dev);
-extern int __must_check device_add(struct device *dev);
-extern void device_del(struct device *dev);
-extern int device_for_each_child(struct device *dev, void *data,
-		     int (*fn)(struct device *dev, void *data));
-extern int device_for_each_child_reverse(struct device *dev, void *data,
-		     int (*fn)(struct device *dev, void *data));
-extern struct device *device_find_child(struct device *dev, void *data,
-				int (*match)(struct device *dev, void *data));
-extern struct device *device_find_child_by_name(struct device *parent,
-						const char *name);
-extern int device_rename(struct device *dev, const char *new_name);
-extern int device_move(struct device *dev, struct device *new_parent,
-		       enum dpm_order dpm_order);
-extern int device_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid);
-extern const char *device_get_devnode(struct device *dev,
-				      umode_t *mode, kuid_t *uid, kgid_t *gid,
-				      const char **tmp);
+int __must_check device_register(struct device *dev);
+void device_unregister(struct device *dev);
+void device_initialize(struct device *dev);
+int __must_check device_add(struct device *dev);
+void device_del(struct device *dev);
+int device_for_each_child(struct device *dev, void *data,
+			  int (*fn)(struct device *dev, void *data));
+int device_for_each_child_reverse(struct device *dev, void *data,
+				  int (*fn)(struct device *dev, void *data));
+struct device *device_find_child(struct device *dev, void *data,
+				 int (*match)(struct device *dev, void *data));
+struct device *device_find_child_by_name(struct device *parent,
+					 const char *name);
+int device_rename(struct device *dev, const char *new_name);
+int device_move(struct device *dev, struct device *new_parent,
+		enum dpm_order dpm_order);
+int device_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid);
+const char *device_get_devnode(struct device *dev, umode_t *mode, kuid_t *uid,
+			       kgid_t *gid, const char **tmp);
 
 static inline bool device_supports_offline(struct device *dev)
 {
 	return dev->bus && dev->bus->offline && dev->bus->online;
 }
 
-extern void lock_device_hotplug(void);
-extern void unlock_device_hotplug(void);
-extern int lock_device_hotplug_sysfs(void);
-extern int device_offline(struct device *dev);
-extern int device_online(struct device *dev);
-extern void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
-extern void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
+void lock_device_hotplug(void);
+void unlock_device_hotplug(void);
+int lock_device_hotplug_sysfs(void);
+int device_offline(struct device *dev);
+int device_online(struct device *dev);
+void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
+void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
 void device_set_of_node_from_dev(struct device *dev, const struct device *dev2);
 
 static inline int dev_num_vf(struct device *dev)
@@ -854,14 +848,13 @@ static inline int dev_num_vf(struct device *dev)
 /*
  * Root device objects for grouping under /sys/devices
  */
-extern struct device *__root_device_register(const char *name,
-					     struct module *owner);
+struct device *__root_device_register(const char *name, struct module *owner);
 
 /* This is a macro to avoid include problems with THIS_MODULE */
 #define root_device_register(name) \
 	__root_device_register(name, THIS_MODULE)
 
-extern void root_device_unregister(struct device *root);
+void root_device_unregister(struct device *root);
 
 static inline void *dev_get_platdata(const struct device *dev)
 {
@@ -872,33 +865,31 @@ static inline void *dev_get_platdata(const struct device *dev)
  * Manual binding of a device to driver. See drivers/base/bus.c
  * for information on use.
  */
-extern int __must_check device_bind_driver(struct device *dev);
-extern void device_release_driver(struct device *dev);
-extern int  __must_check device_attach(struct device *dev);
-extern int __must_check driver_attach(struct device_driver *drv);
-extern void device_initial_probe(struct device *dev);
-extern int __must_check device_reprobe(struct device *dev);
+int __must_check device_bind_driver(struct device *dev);
+void device_release_driver(struct device *dev);
+int  __must_check device_attach(struct device *dev);
+int __must_check driver_attach(struct device_driver *drv);
+void device_initial_probe(struct device *dev);
+int __must_check device_reprobe(struct device *dev);
 
-extern bool device_is_bound(struct device *dev);
+bool device_is_bound(struct device *dev);
 
 /*
  * Easy functions for dynamically creating devices on the fly
  */
-extern __printf(5, 6)
-struct device *device_create(struct class *cls, struct device *parent,
-			     dev_t devt, void *drvdata,
-			     const char *fmt, ...);
-extern __printf(6, 7)
-struct device *device_create_with_groups(struct class *cls,
-			     struct device *parent, dev_t devt, void *drvdata,
-			     const struct attribute_group **groups,
-			     const char *fmt, ...);
-extern void device_destroy(struct class *cls, dev_t devt);
-
-extern int __must_check device_add_groups(struct device *dev,
-					const struct attribute_group **groups);
-extern void device_remove_groups(struct device *dev,
-				 const struct attribute_group **groups);
+__printf(5, 6) struct device *
+device_create(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,
+			  void *drvdata, const struct attribute_group **groups,
+			  const char *fmt, ...);
+void device_destroy(struct class *cls, dev_t devt);
+
+int __must_check device_add_groups(struct device *dev,
+				   const struct attribute_group **groups);
+void device_remove_groups(struct device *dev,
+			  const struct attribute_group **groups);
 
 static inline int __must_check device_add_group(struct device *dev,
 					const struct attribute_group *grp)
@@ -916,14 +907,14 @@ static inline void device_remove_group(struct device *dev,
 	return device_remove_groups(dev, groups);
 }
 
-extern int __must_check devm_device_add_groups(struct device *dev,
+int __must_check devm_device_add_groups(struct device *dev,
 					const struct attribute_group **groups);
-extern void devm_device_remove_groups(struct device *dev,
-				      const struct attribute_group **groups);
-extern int __must_check devm_device_add_group(struct device *dev,
-					const struct attribute_group *grp);
-extern void devm_device_remove_group(struct device *dev,
-				     const struct attribute_group *grp);
+void devm_device_remove_groups(struct device *dev,
+			       const struct attribute_group **groups);
+int __must_check devm_device_add_group(struct device *dev,
+				       const struct attribute_group *grp);
+void devm_device_remove_group(struct device *dev,
+			      const struct attribute_group *grp);
 
 /*
  * Platform "fixup" functions - allow the platform to have their say
@@ -940,21 +931,21 @@ extern int (*platform_notify_remove)(struct device *dev);
  * get_device - atomically increment the reference count for the device.
  *
  */
-extern struct device *get_device(struct device *dev);
-extern void put_device(struct device *dev);
-extern bool kill_device(struct device *dev);
+struct device *get_device(struct device *dev);
+void put_device(struct device *dev);
+bool kill_device(struct device *dev);
 
 #ifdef CONFIG_DEVTMPFS
-extern int devtmpfs_mount(void);
+int devtmpfs_mount(void);
 #else
 static inline int devtmpfs_mount(void) { return 0; }
 #endif
 
 /* drivers/base/power/shutdown.c */
-extern void device_shutdown(void);
+void device_shutdown(void);
 
 /* debugging and troubleshooting/diagnostic helpers. */
-extern const char *dev_driver_string(const struct device *dev);
+const char *dev_driver_string(const struct device *dev);
 
 /* Device links interface. */
 struct device_link *device_link_add(struct device *consumer,
