preempt_enable();
 }
 
+#ifdef CONFIG_SMP
+static inline
+int select_task_rq(struct task_struct *p, int sd_flags, int wake_flags)
+{
+       return p->sched_class->select_task_rq(p, sd_flags, wake_flags);
+}
+#endif
+
 /***
  * try_to_wake_up - wake up a thread
  * @p: the to-be-woken-up thread
        p->state = TASK_WAKING;
        task_rq_unlock(rq, &flags);
 
-       cpu = p->sched_class->select_task_rq(p, SD_BALANCE_WAKE, wake_flags);
+       cpu = select_task_rq(p, SD_BALANCE_WAKE, wake_flags);
        if (cpu != orig_cpu) {
                local_irq_save(flags);
                rq = cpu_rq(cpu);
                p->sched_class = &fair_sched_class;
 
 #ifdef CONFIG_SMP
-       cpu = p->sched_class->select_task_rq(p, SD_BALANCE_FORK, 0);
+       cpu = select_task_rq(p, SD_BALANCE_FORK, 0);
 #endif
        local_irq_save(flags);
        update_rq_clock(cpu_rq(cpu));
 void sched_exec(void)
 {
        int new_cpu, this_cpu = get_cpu();
-       new_cpu = current->sched_class->select_task_rq(current, SD_BALANCE_EXEC, 0);
+       new_cpu = select_task_rq(current, SD_BALANCE_EXEC, 0);
        put_cpu();
        if (new_cpu != this_cpu)
                sched_migrate_task(current, new_cpu);