cpu/hotplug: Add new {add,remove}_cpu() functions (93ef1429) · Commits · 戴 / test

include/linux/cpu.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -89,6 +89,7 @@ extern ssize_t arch_cpu_release(const char *, size_t);
		#ifdef CONFIG_SMP
		extern bool cpuhp_tasks_frozen;
		int cpu_up(unsigned int cpu);
		int add_cpu(unsigned int cpu);
		void notify_cpu_starting(unsigned int cpu);
		extern void cpu_maps_update_begin(void);
		extern void cpu_maps_update_done(void);
		@@ -118,6 +119,7 @@ extern void cpu_hotplug_disable(void);
		extern void cpu_hotplug_enable(void);
		void clear_tasks_mm_cpumask(int cpu);
		int cpu_down(unsigned int cpu);
		int remove_cpu(unsigned int cpu);

		#else /* CONFIG_HOTPLUG_CPU */

+24 −0

Original line number	Diff line number	Diff line
		@@ -1057,6 +1057,18 @@ int cpu_down(unsigned int cpu)
		}
		EXPORT_SYMBOL(cpu_down);

		int remove_cpu(unsigned int cpu)
		{
		int ret;

		lock_device_hotplug();
		ret = device_offline(get_cpu_device(cpu));
		unlock_device_hotplug();

		return ret;
		}
		EXPORT_SYMBOL_GPL(remove_cpu);

		#else
		#define takedown_cpu NULL
		#endif /CONFIG_HOTPLUG_CPU/
		@@ -1209,6 +1221,18 @@ int cpu_up(unsigned int cpu)
		}
		EXPORT_SYMBOL_GPL(cpu_up);

		int add_cpu(unsigned int cpu)
		{
		int ret;

		lock_device_hotplug();
		ret = device_online(get_cpu_device(cpu));
		unlock_device_hotplug();

		return ret;
		}
		EXPORT_SYMBOL_GPL(add_cpu);

		#ifdef CONFIG_PM_SLEEP_SMP
		static cpumask_var_t frozen_cpus;