diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 4e5764083fd8..c847e9a3033d 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -143,21 +143,17 @@ static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
 	return to_gpd_data(dev->power.subsys_data->domain_data);
 }
 
-extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
-				 struct device *dev,
-				 struct gpd_timing_data *td);
-
-extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
-				  struct device *dev);
-extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
-				  struct generic_pm_domain *new_subdomain);
-extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
-				     struct generic_pm_domain *target);
-extern int pm_genpd_init(struct generic_pm_domain *genpd,
-			 struct dev_power_governor *gov, bool is_off);
-extern int pm_genpd_remove(struct generic_pm_domain *genpd);
-extern int dev_pm_genpd_set_performance_state(struct device *dev,
-					      unsigned int state);
+int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
+			  struct gpd_timing_data *td);
+int pm_genpd_remove_device(struct generic_pm_domain *genpd, struct device *dev);
+int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
+			   struct generic_pm_domain *new_subdomain);
+int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
+			      struct generic_pm_domain *target);
+int pm_genpd_init(struct generic_pm_domain *genpd,
+		  struct dev_power_governor *gov, bool is_off);
+int pm_genpd_remove(struct generic_pm_domain *genpd);
+int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state);
 
 extern struct dev_power_governor simple_qos_governor;
 extern struct dev_power_governor pm_domain_always_on_gov;
@@ -215,8 +211,8 @@ static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
 }
 
 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
-extern void pm_genpd_syscore_poweroff(struct device *dev);
-extern void pm_genpd_syscore_poweron(struct device *dev);
+void pm_genpd_syscore_poweroff(struct device *dev);
+void pm_genpd_syscore_poweron(struct device *dev);
 #else
 static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
 static inline void pm_genpd_syscore_poweron(struct device *dev) {}
@@ -240,14 +236,13 @@ int of_genpd_add_provider_simple(struct device_node *np,
 int of_genpd_add_provider_onecell(struct device_node *np,
 				  struct genpd_onecell_data *data);
 void of_genpd_del_provider(struct device_node *np);
-extern int of_genpd_add_device(struct of_phandle_args *args,
-			       struct device *dev);
-extern int of_genpd_add_subdomain(struct of_phandle_args *parent,
-				  struct of_phandle_args *new_subdomain);
-extern struct generic_pm_domain *of_genpd_remove_last(struct device_node *np);
-extern int of_genpd_parse_idle_states(struct device_node *dn,
-			struct genpd_power_state **states, int *n);
-extern unsigned int of_genpd_opp_to_performance_state(struct device *dev,
+int of_genpd_add_device(struct of_phandle_args *args, struct device *dev);
+int of_genpd_add_subdomain(struct of_phandle_args *parent,
+			   struct of_phandle_args *new_subdomain);
+struct generic_pm_domain *of_genpd_remove_last(struct device_node *np);
+int of_genpd_parse_idle_states(struct device_node *dn,
+			       struct genpd_power_state **states, int *n);
+unsigned int of_genpd_opp_to_performance_state(struct device *dev,
 				struct device_node *opp_node);
 
 int genpd_dev_pm_attach(struct device *dev);
@@ -304,9 +299,9 @@ struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
 
 #ifdef CONFIG_PM
-extern int dev_pm_domain_attach(struct device *dev, bool power_on);
-extern void dev_pm_domain_detach(struct device *dev, bool power_off);
-extern void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
+int dev_pm_domain_attach(struct device *dev, bool power_on);
+void dev_pm_domain_detach(struct device *dev, bool power_off);
+void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
 #else
 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
 {
