cpu-hotplug: refcount based cpu hotplug

[firefly-linux-kernel-4.4.55.git] / include / linux / cpu.h

diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 1d5ded0836eee2161221b25d3ef7b6f432fd0095..a40247e4d462e271c2017709b725e22510bb09c7 100644 (file)
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -83,6 +83,9 @@ static inline void unregister_cpu_notifier(struct notifier_block *nb)
 
 #endif /* CONFIG_SMP */
 extern struct sysdev_class cpu_sysdev_class;
+extern void cpu_hotplug_init(void);
+extern void cpu_maps_update_begin(void);
+extern void cpu_maps_update_done(void);
 
 #ifdef CONFIG_HOTPLUG_CPU
 /* Stop CPUs going up and down. */
@@ -107,7 +110,6 @@ extern void unlock_cpu_hotplug(void);
 #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          /* CONFIG_HOTPLUG_CPU */
 
@@ -119,23 +121,21 @@ static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
 #define lock_cpu_hotplug()     do { } while (0)
 #define unlock_cpu_hotplug()   do { } while (0)
 #define hotcpu_notifier(fn, pri)       do { (void)(fn); } while (0)
-#define register_hotcpu_notifier(nb)   do { (void)(nb); } while (0)
-#define unregister_hotcpu_notifier(nb) do { (void)(nb); } while (0)
-
-/* CPUs don't go offline once they're online w/o CONFIG_HOTPLUG_CPU */
-static inline int cpu_is_offline(int cpu) { return 0; }
+/* These aren't inline functions due to a GCC bug. */
+#define register_hotcpu_notifier(nb)   ({ (void)(nb); 0; })
+#define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
 #endif         /* CONFIG_HOTPLUG_CPU */
 
-#ifdef CONFIG_SUSPEND_SMP
+#ifdef CONFIG_PM_SLEEP_SMP
 extern int suspend_cpu_hotplug;
 
 extern int disable_nonboot_cpus(void);
 extern void enable_nonboot_cpus(void);
-#else
+#else /* !CONFIG_PM_SLEEP_SMP */
 #define suspend_cpu_hotplug    0
 
 static inline int disable_nonboot_cpus(void) { return 0; }
 static inline void enable_nonboot_cpus(void) {}
-#endif
+#endif /* !CONFIG_PM_SLEEP_SMP */
 
 #endif /* _LINUX_CPU_H_ */