PM: Move two sleep-related functions under CONFIG_PM_SLEEP

JIRA: https://issues.redhat.com/browse/RHEL-109251

commit c021c1b
Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Date: Thu, 03 Jul 2025 17:10:40 +0000

Since pm_runtime_force_resume() and pm_runtime_need_not_resume() are only
needed for handling system-wide PM transitions, there is no reason to
compile them in if CONFIG_PM_SLEEP is unset.

Accordingly, move them under CONFIG_PM_SLEEP and make the static
inline stub for pm_runtime_force_resume() return an error to indicate
that it should not be used outside CONFIG_PM_SLEEP.

Putting pm_runtime_force_resume() also allows subsequent changes to
be more straightforward because this function is going to access a
device PM flag that is only defined when CONFIG_PM_SLEEP is set.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://patch.msgid.link/3384523.aeNJFYEL58@rjwysocki.net
Signed-off-by: Mark Langsdorf <mlangsdo@redhat.com>

Author: mlangsdorf

drivers/base/power/runtime.c

@@ -1941,13 +1941,6 @@ void pm_runtime_drop_link(struct device_link *link)
 	pm_request_idle(link->supplier);
 }
 
-bool pm_runtime_need_not_resume(struct device *dev)
-{
-	return atomic_read(&dev->power.usage_count) <= 1 &&
-		(atomic_read(&dev->power.child_count) == 0 ||
-		 dev->power.ignore_children);
-}
-
 /**
  * pm_runtime_force_suspend - Force a device into suspend state if needed.
  * @dev: Device to suspend.
@@ -2009,6 +2002,8 @@ int pm_runtime_force_suspend(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(pm_runtime_force_suspend);
 
+#ifdef CONFIG_PM_SLEEP
+
 /**
  * pm_runtime_force_resume - Force a device into resume state if needed.
  * @dev: Device to resume.
@@ -2052,3 +2047,12 @@ int pm_runtime_force_resume(struct device *dev)
 	return ret;
 }
 EXPORT_SYMBOL_GPL(pm_runtime_force_resume);
+
+bool pm_runtime_need_not_resume(struct device *dev)
+{
+	return atomic_read(&dev->power.usage_count) <= 1 &&
+		(atomic_read(&dev->power.child_count) == 0 ||
+		 dev->power.ignore_children);
+}
+
+#endif /* CONFIG_PM_SLEEP */

include/linux/pm_runtime.h

@@ -66,9 +66,7 @@ static inline bool queue_pm_work(struct work_struct *work)
 
 extern int pm_generic_runtime_suspend(struct device *dev);
 extern int pm_generic_runtime_resume(struct device *dev);
-extern bool pm_runtime_need_not_resume(struct device *dev);
 extern int pm_runtime_force_suspend(struct device *dev);
-extern int pm_runtime_force_resume(struct device *dev);
 
 extern int __pm_runtime_idle(struct device *dev, int rpmflags);
 extern int __pm_runtime_suspend(struct device *dev, int rpmflags);
@@ -259,9 +257,7 @@ static inline bool queue_pm_work(struct work_struct *work) { return false; }
 
 static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
 static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
-static inline bool pm_runtime_need_not_resume(struct device *dev) {return true; }
 static inline int pm_runtime_force_suspend(struct device *dev) { return 0; }
-static inline int pm_runtime_force_resume(struct device *dev) { return 0; }
 
 static inline int __pm_runtime_idle(struct device *dev, int rpmflags)
 {
@@ -332,6 +328,18 @@ static inline void pm_runtime_release_supplier(struct device_link *link) {}
 
 #endif /* !CONFIG_PM */
 
+#ifdef CONFIG_PM_SLEEP
+
+bool pm_runtime_need_not_resume(struct device *dev);
+int pm_runtime_force_resume(struct device *dev);
+
+#else /* !CONFIG_PM_SLEEP */
+
+static inline bool pm_runtime_need_not_resume(struct device *dev) {return true; }
+static inline int pm_runtime_force_resume(struct device *dev) { return -ENXIO; }
+
+#endif /* CONFIG_PM_SLEEP */
+
 /**
  * pm_runtime_idle - Conditionally set up autosuspend of a device or suspend it.
  * @dev: Target device.