[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>
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index b23bf1c..cdfe471 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -41,7 +41,13 @@
#ifdef CONFIG_SMP
/* Need to know about CPUs going up/down? */
extern int register_cpu_notifier(struct notifier_block *nb);
+#ifdef CONFIG_HOTPLUG_CPU
extern void unregister_cpu_notifier(struct notifier_block *nb);
+#else
+static inline void unregister_cpu_notifier(struct notifier_block *nb)
+{
+}
+#endif
extern int current_in_cpu_hotplug(void);
int cpu_up(unsigned int cpu);