linux-kernel - [PATCH] PM: save 8bytes in 'struct dev_pm

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Date:	Tue,  7 Aug 2012 10:57:58 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	Ming Lei <ming.lei@...onical.com>
Subject: [PATCH] PM: save 8bytes in 'struct dev_pm_info'

On ARMv7, sizeof(struct dev_pm_info) becomes 344Bytes from 352Bytes
after applying the patch which only changes fields' order, so we can
save 8bytes per device. Nothing in behaviour changed.

GCC: gcc version 4.5.1

Signed-off-by: Ming Lei <ming.lei@...onical.com>
---
 include/linux/pm.h |   22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/include/linux/pm.h b/include/linux/pm.h
index f067e60..f116d40 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -505,11 +505,6 @@ struct pm_subsys_data {
 
 struct dev_pm_info {
 	pm_message_t		power_state;
-	unsigned int		can_wakeup:1;
-	unsigned int		async_suspend:1;
-	bool			is_prepared:1;	/* Owned by the PM core */
-	bool			is_suspended:1;	/* Ditto */
-	bool			ignore_children:1;
 	spinlock_t		lock;
 #ifdef CONFIG_PM_SLEEP
 	struct list_head	entry;
@@ -519,13 +514,12 @@ struct dev_pm_info {
 #else
 	unsigned int		should_wakeup:1;
 #endif
+	unsigned int		can_wakeup:1;
+	unsigned int		async_suspend:1;
+	bool			is_prepared:1;	/* Owned by the PM core */
+	bool			is_suspended:1;	/* Ditto */
+	bool			ignore_children:1;
 #ifdef CONFIG_PM_RUNTIME
-	struct timer_list	suspend_timer;
-	unsigned long		timer_expires;
-	struct work_struct	work;
-	wait_queue_head_t	wait_queue;
-	atomic_t		usage_count;
-	atomic_t		child_count;
 	unsigned int		disable_depth:3;
 	unsigned int		idle_notification:1;
 	unsigned int		request_pending:1;
@@ -538,6 +532,12 @@ struct dev_pm_info {
 	unsigned int		timer_autosuspends:1;
 	enum rpm_request	request;
 	enum rpm_status		runtime_status;
+	struct timer_list	suspend_timer;
+	unsigned long		timer_expires;
+	struct work_struct	work;
+	wait_queue_head_t	wait_queue;
+	atomic_t		usage_count;
+	atomic_t		child_count;
 	int			runtime_error;
 	int			autosuspend_delay;
 	unsigned long		last_busy;
-- 
1.7.9.5

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