linux-kernel - [PATCH v1 1/3] PM: sleep: Print PM debug messages during hibernation

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Message-ID: <4998903.GXAFRqVoOG@rjwysocki.net>
Date: Fri, 09 May 2025 14:51:47 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH v1 1/3] PM: sleep: Print PM debug messages during hibernation

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

Commit cdb8c100d8a4 ("include/linux/suspend.h: Only show pm_pr_dbg
messages at suspend/resume") caused PM debug messages to only be
printed during system-wide suspend and resume in progress, but it
forgot about hibernation.

Address this by adding a check for hibernation in progress to
pm_debug_messages_should_print().

Fixes: cdb8c100d8a4 ("include/linux/suspend.h: Only show pm_pr_dbg messages at suspend/resume")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 kernel/power/hibernate.c |    5 +++++
 kernel/power/main.c      |    3 ++-
 kernel/power/power.h     |    4 ++++
 3 files changed, 11 insertions(+), 1 deletion(-)

--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -90,6 +90,11 @@
 	atomic_inc(&hibernate_atomic);
 }

+bool hibernation_in_progress(void)
+{
+	return !atomic_read(&hibernate_atomic);
+}
+
 bool hibernation_available(void)
 {
 	return nohibernate == 0 &&
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -613,7 +613,8 @@

 bool pm_debug_messages_should_print(void)
 {
-	return pm_debug_messages_on && pm_suspend_target_state != PM_SUSPEND_ON;
+	return pm_debug_messages_on && (hibernation_in_progress() ||
+		pm_suspend_target_state != PM_SUSPEND_ON);
 }
 EXPORT_SYMBOL_GPL(pm_debug_messages_should_print);

--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -71,10 +71,14 @@
 static inline void enable_restore_image_protection(void) {}
 #endif /* CONFIG_STRICT_KERNEL_RWX */

+extern bool hibernation_in_progress(void);
+
 #else /* !CONFIG_HIBERNATION */

 static inline void hibernate_reserved_size_init(void) {}
 static inline void hibernate_image_size_init(void) {}
+
+static inline bool hibernation_in_progress(void) { return false; }
 #endif /* !CONFIG_HIBERNATION */

 #define power_attr(_name) \