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, 2 insertions, 0 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 639241f4f3d1..24e08d1d900d 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -828,6 +828,7 @@ struct sched_class {
         struct task_struct * (*pick_next_task) (struct rq *rq);
         void (*put_prev_task) (struct rq *rq, struct task_struct *p);
 
+#ifdef CONFIG_SMP
         unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
                         struct rq *busiest, unsigned long max_load_move,
                         struct sched_domain *sd, enum cpu_idle_type idle,
@@ -836,6 +837,7 @@ struct sched_class {
         int (*move_one_task) (struct rq *this_rq, int this_cpu,
                               struct rq *busiest, struct sched_domain *sd,
                               enum cpu_idle_type idle);
+#endif
 
         void (*set_curr_task) (struct rq *rq);
         void (*task_tick) (struct rq *rq, struct task_struct *p);