sh: provide percpu CPU states for hotplug notifiers.

This provides percpu CPU states in preparation for CPU hotplug and the
associated notifier chains.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/include/asm/smp.h

@@ -10,6 +10,7 @@
 #include <linux/spinlock.h>
 #include <asm/atomic.h>
 #include <asm/current.h>
+#include <asm/percpu.h>
 
 #define raw_smp_processor_id()	(current_thread_info()->cpu)
 
@@ -30,6 +31,8 @@ enum {
 	SMP_MSG_NR,	/* must be last */
 };
 
+DECLARE_PER_CPU(int, cpu_state);
+
 void smp_message_recv(unsigned int msg);
 void smp_timer_broadcast(const struct cpumask *mask);
 

arch/sh/kernel/smp.c

@@ -33,6 +33,9 @@ int __cpu_logical_map[NR_CPUS];		/* Map logical to physical */
 
 struct plat_smp_ops *mp_ops = NULL;
 
+/* State of each CPU */
+DEFINE_PER_CPU(int, cpu_state) = { 0 };
+
 void __cpuinit register_smp_ops(struct plat_smp_ops *ops)
 {
 	if (mp_ops)
@@ -72,11 +75,13 @@ void __devinit smp_prepare_boot_cpu(void)
 
 	set_cpu_online(cpu, true);
 	set_cpu_possible(cpu, true);
+
+	per_cpu(cpu_state, cpu) = CPU_ONLINE;
 }
 
 asmlinkage void __cpuinit start_secondary(void)
 {
-	unsigned int cpu;
+	unsigned int cpu = smp_processor_id();
 	struct mm_struct *mm = &init_mm;
 
 	enable_mmu();
@@ -90,19 +95,18 @@ asmlinkage void __cpuinit start_secondary(void)
 
 	preempt_disable();
 
-	notify_cpu_starting(smp_processor_id());
+	notify_cpu_starting(cpu);
 
 	local_irq_enable();
 
-	cpu = smp_processor_id();
-
 	/* Enable local timers */
 	local_timer_setup(cpu);
 	calibrate_delay();
 
 	smp_store_cpu_info(cpu);
 
 	set_cpu_online(cpu, true);
+	per_cpu(cpu_state, cpu) = CPU_ONLINE;
 
 	cpu_idle();
 }
@@ -127,6 +131,8 @@ int __cpuinit __cpu_up(unsigned int cpu)
 		return PTR_ERR(tsk);
 	}
 
+	per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
+
 	/* Fill in data in head.S for secondary cpus */
 	stack_start.sp = tsk->thread.sp;
 	stack_start.thread_info = tsk->stack;