this patch was not built on !SMP:
 kernel/sched_rt.c: In function 'inc_rt_tasks':
 kernel/sched_rt.c:404: error: 'struct rq' has no member named 'online'
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 #if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
        if (rt_se_prio(rt_se) < rt_rq->highest_prio) {
                struct rq *rq = rq_of_rt_rq(rt_rq);
-               rt_rq->highest_prio = rt_se_prio(rt_se);
 
+               rt_rq->highest_prio = rt_se_prio(rt_se);
+#ifdef CONFIG_SMP
                if (rq->online)
                        cpupri_set(&rq->rd->cpupri, rq->cpu,
                                   rt_se_prio(rt_se));
+#endif
        }
 #endif
 #ifdef CONFIG_SMP
        if (rt_se->nr_cpus_allowed > 1) {
                struct rq *rq = rq_of_rt_rq(rt_rq);
+
                rq->rt.rt_nr_migratory++;
        }