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authorRafael J. Wysocki <rjw@sisk.pl>2007-07-29 23:27:18 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-29 16:45:38 -0700
commit296699de6bdc717189a331ab6bbe90e05c94db06 (patch)
tree53c847ecc8cce11952502921844052e44ca60d5e /kernel/power/power.h
parentb0cb1a19d05b8ea8611a9ef48a17fe417f1832e6 (diff)
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>
Diffstat (limited to 'kernel/power/power.h')
-rw-r--r--kernel/power/power.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 9080914796f..95fbf2dd3fe 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -176,9 +176,17 @@ struct timeval;
extern void swsusp_show_speed(struct timeval *, struct timeval *,
unsigned int, char *);
+#ifdef CONFIG_SUSPEND
/* kernel/power/main.c */
-extern int suspend_enter(suspend_state_t state);
extern int suspend_devices_and_enter(suspend_state_t state);
+#else /* !CONFIG_SUSPEND */
+static inline int suspend_devices_and_enter(suspend_state_t state)
+{
+ return -ENOSYS;
+}
+#endif /* !CONFIG_SUSPEND */
+
+/* kernel/power/common.c */
extern struct blocking_notifier_head pm_chain_head;
static inline int pm_notifier_call_chain(unsigned long val)