sched: isolate SMP balancing code a bit more

At the moment, a lot of load balancing code that is irrelevant to non
SMP systems gets included during non SMP builds.

This patch addresses this issue and reduces the binary size on non
SMP systems:

   text    data     bss     dec     hex filename
  10983      28    1192   12203    2fab sched.o.before
  10739      28    1192   11959    2eb7 sched.o.after

Signed-off-by: Peter Williams <pwil3058@bigpond.net.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 0 deletions

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index e9395b7119e6..8abd752a0ebd 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -98,6 +98,7 @@ static void put_prev_task_rt(struct rq *rq, struct task_struct *p)
         p->se.exec_start = 0;
 }
 
+#ifdef CONFIG_SMP
 /*
  * Load-balancing iterator. Note: while the runqueue stays locked
  * during the whole iteration, the current task might be
@@ -202,6 +203,7 @@ move_one_task_rt(struct rq *this_rq, int this_cpu, struct rq *busiest,
         return iter_move_one_task(this_rq, this_cpu, busiest, sd, idle,
                                   &rt_rq_iterator);
 }
+#endif
 
 static void task_tick_rt(struct rq *rq, struct task_struct *p)
 {
@@ -245,8 +247,10 @@ const struct sched_class rt_sched_class = {
         .pick_next_task         = pick_next_task_rt,
         .put_prev_task          = put_prev_task_rt,
 
+#ifdef CONFIG_SMP
         .load_balance           = load_balance_rt,
         .move_one_task          = move_one_task_rt,
+#endif
 
         .set_curr_task          = set_curr_task_rt,
         .task_tick              = task_tick_rt,