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Subject[PATCH v2 1/3] Introduce helper functions
Date
Introduce helper functions used to prevent cpu hotplug (online operation) from
running in parallel with suspend or hibernate.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
---

include/linux/suspend.h | 21 +++++++++++++++++++--
1 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 6bbcef2..89a5d27 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -276,7 +276,24 @@ static inline bool system_entering_hibernation(void) { return false; }
#define PM_RESTORE_PREPARE 0x0005 /* Going to restore a saved image */
#define PM_POST_RESTORE 0x0006 /* Restore failed */

+extern struct mutex pm_mutex;
+
#ifdef CONFIG_PM_SLEEP
+
+/*
+ * Allow operations like CPU online to exclude suspend and hibernation
+ */
+static inline int trylock_pm_sleep(void)
+{
+ return mutex_trylock(&pm_mutex);
+}
+
+static inline void unlock_pm_sleep(void)
+{
+ mutex_unlock(&pm_mutex);
+}
+
void save_processor_state(void);
void restore_processor_state(void);

@@ -298,6 +315,8 @@ extern bool pm_get_wakeup_count(unsigned int *count);
extern bool pm_save_wakeup_count(unsigned int count);
#else /* !CONFIG_PM_SLEEP */

+static inline int trylock_pm_sleep(void) { return 1; }
+static inline void unlock_pm_sleep(void) {}
static inline int register_pm_notifier(struct notifier_block *nb)
{
return 0;
@@ -313,8 +332,6 @@ static inline int unregister_pm_notifier(struct notifier_block *nb)
static inline bool pm_wakeup_pending(void) { return false; }
#endif /* !CONFIG_PM_SLEEP */

-extern struct mutex pm_mutex;
-
#ifndef CONFIG_HIBERNATE_CALLBACKS
static inline void lock_system_sleep(void) {}
static inline void unlock_system_sleep(void) {}


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