From: Chandra Seetharaman Define new macros register_hotcpu_notifier() and unregister_hotcpu_notifier() that redefines register_cpu_notifier() and unregister_cpu_notifier() for use only when HOTPLUG_CPU is defined. Signed-off-by: Chandra Seetharaman Cc: Ashok Raj Signed-off-by: Andrew Morton --- include/linux/cpu.h | 4 ++++ 1 file changed, 4 insertions(+) diff -puN include/linux/cpu.h~cpu-hotplug-add-hotplug-versions-of-cpu_notifier include/linux/cpu.h --- a/include/linux/cpu.h~cpu-hotplug-add-hotplug-versions-of-cpu_notifier +++ a/include/linux/cpu.h @@ -79,6 +79,8 @@ extern int lock_cpu_hotplug_interruptibl { .notifier_call = fn, .priority = pri }; \ register_cpu_notifier(&fn##_nb); \ } +#define register_hotcpu_notifier(nb) register_cpu_notifier(nb) +#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) int cpu_down(unsigned int cpu); #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu)) #else @@ -86,6 +88,8 @@ int cpu_down(unsigned int cpu); #define unlock_cpu_hotplug() do { } while (0) #define lock_cpu_hotplug_interruptible() 0 #define hotcpu_notifier(fn, pri) +#define register_hotcpu_notifier(nb) +#define unregister_hotcpu_notifier(nb) /* CPUs don't go offline once they're online w/o CONFIG_HOTPLUG_CPU */ static inline int cpu_is_offline(int cpu) { return 0; } _