powerpc/smp: Fix generic_mach_cpu_die()

This is used by some "soft" hotplug implementations. I needs to
call idle_task_exit() when the CPU is going away, and we remove
the now no-longer needed set_cpu_online() and local_irq_enable()
which are handled by the return to start_secondary

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 1 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 1c9956c43801..3c0fab5e1e16 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -362,14 +362,13 @@ void generic_mach_cpu_die(void)
         unsigned int cpu;
 
         local_irq_disable();
+        idle_task_exit();
         cpu = smp_processor_id();
         printk(KERN_DEBUG "CPU%d offline\n", cpu);
         __get_cpu_var(cpu_state) = CPU_DEAD;
         smp_wmb();
         while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE)
                 cpu_relax();
-        set_cpu_online(cpu, true);
-        local_irq_enable();
 }
 #endif