MIPS: call ->smp_finish() a little late

We have move irq enable to ->smp_finish. Place ->smp_finish() a little
late to prepare for move set_cpu_online() into start_secondary.
And it's not necessary to call cpu_set(cpu, cpu_callin_map) and
synchronise_count_slave() with irq enabled.
Signed-off-by: Yong Zhang <yong.zhang0@gmail.com>
Cc: Sergei Shtylyov <sshtylyov@mvista.com>
Cc: David Daney <david.daney@cavium.com>
Acked-by: David Daney <david.daney@cavium.com>
Patchwork: https://patchwork.linux-mips.org/patch/3850/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/smp.c

@@ -122,13 +122,14 @@ asmlinkage __cpuinit void start_secondary(void)
 
 	notify_cpu_starting(cpu);
 
-	mp_ops->smp_finish();
 	set_cpu_sibling_map(cpu);
 
 	cpu_set(cpu, cpu_callin_map);
 
 	synchronise_count_slave();
 
+	mp_ops->smp_finish();
+
 	cpu_idle();
 }