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>

1 files changed, 10 insertions, 4 deletions

diff --git a/arch/sh/kernel/smp.c b/arch/sh/kernel/smp.c
index cc87830ace7f..4d27597c5da8 100644
--- a/arch/sh/kernel/smp.c
+++ b/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();
@@ -90,12 +95,10 @@ 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();
@@ -103,6 +106,7 @@ asmlinkage void __cpuinit start_secondary(void)
         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;