linux-kernel - [PATCH v1] PM: sleep: Use bool for all 1-bit fields in struct dev_pm

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Date: Mon, 22 Jan 2024 17:11:26 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Ulf Hansson <ulf.hansson@...aro.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Stanislaw Gruszka <stanislaw.gruszka@...ux.intel.com>
Subject: [PATCH v1] PM: sleep: Use bool for all 1-bit fields in struct dev_pm_info

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

For some 1-bit fields in struct dev_pm_info the data type is bool, while
for some other 1-bit fields in there it is unsigned int, and these
differences are somewhat arbitrary.

For consistency, change the data type of the latter to bool, so that all
of the 1-bit fields in struct dev_pm_info fields are bool.

This also reduces the size of struct device on my x86 systems by 8 B,
from 1120 B to 1112 B.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 include/linux/pm.h |   32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

Index: linux-pm/include/linux/pm.h
===================================================================
--- linux-pm.orig/include/linux/pm.h
+++ linux-pm/include/linux/pm.h
@@ -662,8 +662,8 @@ struct pm_subsys_data {
 
 struct dev_pm_info {
 	pm_message_t		power_state;
-	unsigned int		can_wakeup:1;
-	unsigned int		async_suspend:1;
+	bool			can_wakeup:1;
+	bool			async_suspend:1;
 	bool			in_dpm_list:1;	/* Owned by the PM core */
 	bool			is_prepared:1;	/* Owned by the PM core */
 	bool			is_suspended:1;	/* Ditto */
@@ -682,10 +682,10 @@ struct dev_pm_info {
 	bool			syscore:1;
 	bool			no_pm_callbacks:1;	/* Owned by the PM core */
 	bool			async_in_progress:1;	/* Owned by the PM core */
-	unsigned int		must_resume:1;	/* Owned by the PM core */
-	unsigned int		may_skip_resume:1;	/* Set by subsystems */
+	bool			must_resume:1;	/* Owned by the PM core */
+	bool			may_skip_resume:1;	/* Set by subsystems */
 #else
-	unsigned int		should_wakeup:1;
+	bool			should_wakeup:1;
 #endif
 #ifdef CONFIG_PM
 	struct hrtimer		suspend_timer;
@@ -696,18 +696,18 @@ struct dev_pm_info {
 	atomic_t		usage_count;
 	atomic_t		child_count;
 	unsigned int		disable_depth:3;
-	unsigned int		idle_notification:1;
-	unsigned int		request_pending:1;
-	unsigned int		deferred_resume:1;
-	unsigned int		needs_force_resume:1;
-	unsigned int		runtime_auto:1;
+	bool			idle_notification:1;
+	bool			request_pending:1;
+	bool			deferred_resume:1;
+	bool			needs_force_resume:1;
+	bool			runtime_auto:1;
 	bool			ignore_children:1;
-	unsigned int		no_callbacks:1;
-	unsigned int		irq_safe:1;
-	unsigned int		use_autosuspend:1;
-	unsigned int		timer_autosuspends:1;
-	unsigned int		memalloc_noio:1;
-	unsigned int		links_count;
+	bool			no_callbacks:1;
+	bool			irq_safe:1;
+	bool			use_autosuspend:1;
+	bool			timer_autosuspends:1;
+	bool			memalloc_noio:1;
+	bool			links_count;
 	enum rpm_request	request;
 	enum rpm_status		runtime_status;
 	enum rpm_status		last_status;