[PATCH] cpu hotplug: make [un]register_cpu_notifier init time only
CPUs come online only at init time (unless CONFIG_HOTPLUG_CPU is defined). So, cpu_notifier functionality need to be available only at init time. This patch makes register_cpu_notifier() available only at init time, unless CONFIG_HOTPLUG_CPU is defined. This patch exports register_cpu_notifier() and unregister_cpu_notifier() only if CONFIG_HOTPLUG_CPU is defined. Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Cc: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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65edc68c34
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@ -1497,7 +1497,8 @@ int cpufreq_update_policy(unsigned int cpu)
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}
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EXPORT_SYMBOL(cpufreq_update_policy);
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static int __cpuinit cpufreq_cpu_callback(struct notifier_block *nfb,
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#ifdef CONFIG_HOTPLUG_CPU
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static int cpufreq_cpu_callback(struct notifier_block *nfb,
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unsigned long action, void *hcpu)
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{
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unsigned int cpu = (unsigned long)hcpu;
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@ -1536,6 +1537,7 @@ static struct notifier_block cpufreq_cpu_notifier =
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{
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.notifier_call = cpufreq_cpu_callback,
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};
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#endif /* CONFIG_HOTPLUG_CPU */
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/*********************************************************************
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* REGISTER / UNREGISTER CPUFREQ DRIVER *
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@ -1596,7 +1598,7 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
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}
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if (!ret) {
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register_cpu_notifier(&cpufreq_cpu_notifier);
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register_hotcpu_notifier(&cpufreq_cpu_notifier);
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dprintk("driver %s up and running\n", driver_data->name);
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cpufreq_debug_enable_ratelimit();
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}
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@ -1628,7 +1630,7 @@ int cpufreq_unregister_driver(struct cpufreq_driver *driver)
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dprintk("unregistering driver %s\n", driver->name);
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sysdev_driver_unregister(&cpu_sysdev_class, &cpufreq_sysdev_driver);
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unregister_cpu_notifier(&cpufreq_cpu_notifier);
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unregister_hotcpu_notifier(&cpufreq_cpu_notifier);
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spin_lock_irqsave(&cpufreq_driver_lock, flags);
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cpufreq_driver = NULL;
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@ -350,7 +350,7 @@ __init cpufreq_stats_init(void)
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return ret;
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}
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register_cpu_notifier(&cpufreq_stat_cpu_notifier);
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register_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
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lock_cpu_hotplug();
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for_each_online_cpu(cpu) {
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cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier, CPU_ONLINE,
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@ -368,7 +368,7 @@ __exit cpufreq_stats_exit(void)
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CPUFREQ_POLICY_NOTIFIER);
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cpufreq_unregister_notifier(¬ifier_trans_block,
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CPUFREQ_TRANSITION_NOTIFIER);
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unregister_cpu_notifier(&cpufreq_stat_cpu_notifier);
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unregister_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
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lock_cpu_hotplug();
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for_each_online_cpu(cpu) {
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cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier, CPU_DEAD,
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@ -41,7 +41,13 @@ struct notifier_block;
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#ifdef CONFIG_SMP
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/* Need to know about CPUs going up/down? */
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extern int register_cpu_notifier(struct notifier_block *nb);
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#ifdef CONFIG_HOTPLUG_CPU
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extern void unregister_cpu_notifier(struct notifier_block *nb);
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#else
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static inline void unregister_cpu_notifier(struct notifier_block *nb)
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{
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}
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#endif
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extern int current_in_cpu_hotplug(void);
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int cpu_up(unsigned int cpu);
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@ -18,7 +18,7 @@
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/* This protects CPUs going up and down... */
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static DEFINE_MUTEX(cpucontrol);
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static BLOCKING_NOTIFIER_HEAD(cpu_chain);
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static __cpuinitdata BLOCKING_NOTIFIER_HEAD(cpu_chain);
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#ifdef CONFIG_HOTPLUG_CPU
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static struct task_struct *lock_cpu_hotplug_owner;
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@ -69,10 +69,13 @@ EXPORT_SYMBOL_GPL(lock_cpu_hotplug_interruptible);
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#endif /* CONFIG_HOTPLUG_CPU */
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/* Need to know about CPUs going up/down? */
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int register_cpu_notifier(struct notifier_block *nb)
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int __cpuinit register_cpu_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&cpu_chain, nb);
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}
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#ifdef CONFIG_HOTPLUG_CPU
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EXPORT_SYMBOL(register_cpu_notifier);
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void unregister_cpu_notifier(struct notifier_block *nb)
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@ -81,7 +84,6 @@ void unregister_cpu_notifier(struct notifier_block *nb)
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}
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EXPORT_SYMBOL(unregister_cpu_notifier);
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#ifdef CONFIG_HOTPLUG_CPU
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static inline void check_for_tasks(int cpu)
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{
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struct task_struct *p;
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