[POWERPC] Fix DEBUG_PREEMPT warning when warning

The powerpc show_regs prints CPU using smp_processor_id: change that to
raw_smp_processor_id, so that when it's showing a WARN_ON backtrace without
preemption disabled, DEBUG_PREEMPT doesn't mess up that warning with its own.
Signed-off-by: NHugh Dickins <hugh@veritas.com>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/kernel/process.c

@@ -462,7 +462,7 @@ void show_regs(struct pt_regs * regs)
 	       current, task_pid_nr(current), current->comm, task_thread_info(current));
 
 #ifdef CONFIG_SMP
-	printk(" CPU: %d", smp_processor_id());
+	printk(" CPU: %d", raw_smp_processor_id());
 #endif /* CONFIG_SMP */
 
 	for (i = 0;  i < 32;  i++) {