x86: add cpu hotplug hooks into smp_ops

Signed-off-by: Alex Nixon <alex.nixon@citrix.com>
Acked-by: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/process_32.c

@@ -91,7 +91,7 @@ static void cpu_exit_clear(void)
 }
 
 /* We don't actually take CPU down, just spin without interrupts. */
-static inline void play_dead(void)
+void native_play_dead(void)
 {
 	/* This must be done before dead CPU ack */
 	cpu_exit_clear();
@@ -107,7 +107,7 @@ static inline void play_dead(void)
 	wbinvd_halt();
 }
 #else
-static inline void play_dead(void)
+void native_play_dead(void)
 {
 	BUG();
 }

arch/x86/kernel/process_64.c

@@ -90,7 +90,7 @@ DECLARE_PER_CPU(int, cpu_state);
 
 #include <asm/nmi.h>
 /* We halt the CPU with physical CPU hotplug */
-static inline void play_dead(void)
+void native_play_dead(void)
 {
 	idle_task_exit();
 	mb();
@@ -102,7 +102,7 @@ static inline void play_dead(void)
 	wbinvd_halt();
 }
 #else
-static inline void play_dead(void)
+void native_play_dead(void)
 {
 	BUG();
 }

arch/x86/kernel/smp.c

@@ -214,12 +214,16 @@ void smp_call_function_single_interrupt(struct pt_regs *regs)
 struct smp_ops smp_ops = {
 	.smp_prepare_boot_cpu = native_smp_prepare_boot_cpu,
 	.smp_prepare_cpus = native_smp_prepare_cpus,
-	.cpu_up = native_cpu_up,
 	.smp_cpus_done = native_smp_cpus_done,
 
 	.smp_send_stop = native_smp_send_stop,
 	.smp_send_reschedule = native_smp_send_reschedule,
 
+	.cpu_up = native_cpu_up,
+	.cpu_die = native_cpu_die,
+	.cpu_disable = native_cpu_disable,
+	.play_dead = native_play_dead,
+
 	.send_call_func_ipi = native_send_call_func_ipi,
 	.send_call_func_single_ipi = native_send_call_func_single_ipi,
 };

arch/x86/kernel/smpboot.c

@@ -1346,7 +1346,7 @@ static void __ref remove_cpu_from_maps(int cpu)
 	numa_remove_cpu(cpu);
 }
 
-int __cpu_disable(void)
+int native_cpu_disable(void)
 {
 	int cpu = smp_processor_id();
 
@@ -1385,7 +1385,7 @@ int __cpu_disable(void)
 	return 0;
 }
 
-void __cpu_die(unsigned int cpu)
+void native_cpu_die(unsigned int cpu)
 {
 	/* We don't do anything here: idle task is faking death itself. */
 	unsigned int i;
@@ -1403,12 +1403,12 @@ void __cpu_die(unsigned int cpu)
 	printk(KERN_ERR "CPU %u didn't die...\n", cpu);
 }
 #else /* ... !CONFIG_HOTPLUG_CPU */
-int __cpu_disable(void)
+int native_cpu_disable(void)
 {
 	return -ENOSYS;
 }
 
-void __cpu_die(unsigned int cpu)
+void native_cpu_die(unsigned int cpu)
 {
 	/* We said "no" in __cpu_disable */
 	BUG();

include/asm-x86/smp.h

@@ -47,12 +47,16 @@ extern struct {
 struct smp_ops {
 	void (*smp_prepare_boot_cpu)(void);
 	void (*smp_prepare_cpus)(unsigned max_cpus);
-	int (*cpu_up)(unsigned cpu);
 	void (*smp_cpus_done)(unsigned max_cpus);
 
 	void (*smp_send_stop)(void);
 	void (*smp_send_reschedule)(int cpu);
 
+	int (*cpu_up)(unsigned cpu);
+	int (*cpu_disable)(void);
+	void (*cpu_die)(unsigned int cpu);
+	void (*play_dead)(void);
+
 	void (*send_call_func_ipi)(cpumask_t mask);
 	void (*send_call_func_single_ipi)(int cpu);
 };
@@ -91,6 +95,21 @@ static inline int __cpu_up(unsigned int cpu)
 	return smp_ops.cpu_up(cpu);
 }
 
+static inline int __cpu_disable(void)
+{
+	return smp_ops.cpu_disable();
+}
+
+static inline void __cpu_die(unsigned int cpu)
+{
+	smp_ops.cpu_die(cpu);
+}
+
+static inline void play_dead(void)
+{
+	smp_ops.play_dead();
+}
+
 static inline void smp_send_reschedule(int cpu)
 {
 	smp_ops.smp_send_reschedule(cpu);
@@ -110,12 +129,13 @@ void native_smp_prepare_boot_cpu(void);
 void native_smp_prepare_cpus(unsigned int max_cpus);
 void native_smp_cpus_done(unsigned int max_cpus);
 int native_cpu_up(unsigned int cpunum);
+int native_cpu_disable(void);
+void native_cpu_die(unsigned int cpu);
+void native_play_dead(void);
+
 void native_send_call_func_ipi(cpumask_t mask);
 void native_send_call_func_single_ipi(int cpu);
 
-extern int __cpu_disable(void);
-extern void __cpu_die(unsigned int cpu);
-
 void smp_store_cpu_info(int id);
 #define cpu_physical_id(cpu)	per_cpu(x86_cpu_to_apicid, cpu)