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Date: Mon, 10 Oct 2011 18:02:32 +0530
From: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To: rjw@...k.pl
Cc: srivatsa.bhat@...ux.vnet.ibm.com, bp@...64.org, pavel@....cz,
len.brown@...el.com, tj@...nel.org, mingo@...e.hu,
a.p.zijlstra@...llo.nl, akpm@...ux-foundation.org,
suresh.b.siddha@...el.com, lucas.demarchi@...fusion.mobi,
rusty@...tcorp.com.au, rdunlap@...otime.net,
vatsa@...ux.vnet.ibm.com, ashok.raj@...el.com,
tigran@...azian.fsnet.co.uk, tglx@...utronix.de, hpa@...or.com,
linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org
Subject: [PATCH v2 1/3] Introduce helper functions
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@...ux.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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