Introduce CONFIG_SUSPEND for suspend-to-Ram and standby

Introduce CONFIG_SUSPEND representing the ability to enter system sleep
states, such as the ACPI S3 state, and allow the user to choose SUSPEND
and HIBERNATION independently of each other.

Make HOTPLUG_CPU be selected automatically if SUSPEND or HIBERNATION has
been chosen and the kernel is intended for SMP systems.

Also, introduce CONFIG_PM_SLEEP which is automatically selected if
CONFIG_SUSPEND or CONFIG_HIBERNATION is set and use it to select the
code needed for both suspend and hibernation.

The top-level power management headers and the ACPI code related to
suspend and hibernation are modified to use the new definitions (the
changes in drivers/acpi/sleep/main.c are, mostly, moving code to reduce
the number of ifdefs).

There are many other files in which CONFIG_PM can be replaced with
CONFIG_PM_SLEEP or even with CONFIG_SUSPEND, but they can be updated in
the future.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 11 insertions, 4 deletions

diff --git a/include/linux/pm.h b/include/linux/pm.h
index ad3cc2eb0d34..e52f6f83c061 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -165,6 +165,7 @@ struct pm_ops {
         int (*finish)(suspend_state_t state);
 };
 
+#ifdef CONFIG_SUSPEND
 extern struct pm_ops *pm_ops;
 
 /**
@@ -193,6 +194,12 @@ extern void arch_suspend_disable_irqs(void);
 extern void arch_suspend_enable_irqs(void);
 
 extern int pm_suspend(suspend_state_t state);
+#else /* !CONFIG_SUSPEND */
+#define suspend_valid_only_mem  NULL
+
+static inline void pm_set_ops(struct pm_ops *pm_ops) {}
+static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
+#endif /* !CONFIG_SUSPEND */
 
 /*
  * Device power management
@@ -266,7 +273,7 @@ typedef struct pm_message {
 struct dev_pm_info {
         pm_message_t            power_state;
         unsigned                can_wakeup:1;
-#ifdef  CONFIG_PM
+#ifdef  CONFIG_PM_SLEEP
         unsigned                should_wakeup:1;
         struct list_head        entry;
 #endif
@@ -276,7 +283,7 @@ extern int device_power_down(pm_message_t state);
 extern void device_power_up(void);
 extern void device_resume(void);
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 extern int device_suspend(pm_message_t state);
 extern int device_prepare_suspend(pm_message_t state);
 
@@ -306,7 +313,7 @@ static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
         return 0;
 }
 
-#else /* !CONFIG_PM */
+#else /* !CONFIG_PM_SLEEP */
 
 static inline int device_suspend(pm_message_t state)
 {
@@ -323,7 +330,7 @@ static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
         return 0;
 }
 
-#endif
+#endif /* !CONFIG_PM_SLEEP */
 
 /* changes to device_may_wakeup take effect on the next pm state change.
  * by default, devices should wakeup if they can.