linux-kernel - [PATCH v1 4/9] PM: Move pm_runtime_force_suspend/resume() under CONFIG_PM

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Message-ID: <2045419.usQuhbGJ8B@rjwysocki.net>
Date: Wed, 25 Jun 2025 21:19:55 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Linux ACPI <linux-acpi@...r.kernel.org>,
 Linux PCI <linux-pci@...r.kernel.org>, Ulf Hansson <ulf.hansson@...aro.org>,
 Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject:
 [PATCH v1 4/9] PM: Move pm_runtime_force_suspend/resume() under
 CONFIG_PM_SLEEP

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Since pm_runtime_force_suspend/resume() and pm_runtime_need_not_resume()
are only used during system-wide PM transitions, there is no reason to
compile them in if CONFIG_PM_SLEEP is unset.

Accordingly, move them all under CONFIG_PM_SLEEP and make the static
inline stubs for pm_runtime_force_suspend/resume() return an error
to indicate that they should not be used outside CONFIG_PM_SLEEP.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/base/power/runtime.c |    4 ++++
 include/linux/pm_runtime.h   |   20 ++++++++++++++------
 2 files changed, 18 insertions(+), 6 deletions(-)

--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1941,6 +1941,8 @@
 	pm_request_idle(link->supplier);
 }
 
+#ifdef CONFIG_PM_SLEEP
+
 bool pm_runtime_need_not_resume(struct device *dev)
 {
 	return atomic_read(&dev->power.usage_count) <= 1 &&
@@ -2063,3 +2065,5 @@
 	return ret;
 }
 EXPORT_SYMBOL_GPL(pm_runtime_force_resume);
+
+#endif /* CONFIG_PM_SLEEP */
--- a/include/linux/pm_runtime.h
+++ b/include/linux/pm_runtime.h
@@ -66,9 +66,6 @@
 
 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);
@@ -257,9 +254,6 @@
 
 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)
 {
@@ -330,6 +324,20 @@
 
 #endif /* !CONFIG_PM */
 
+#ifdef CONFIG_PM_SLEEP
+
+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);
+
+#else /* !CONFIG_PM_SLEEP */
+
+static inline bool pm_runtime_need_not_resume(struct device *dev) {return true; }
+static inline int pm_runtime_force_suspend(struct device *dev) { return -ENXIO; }
+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.