sched: mark scheduling classes as const

mark scheduling classes as const. The speeds up the code
a bit and shrinks it:

   text    data     bss     dec     hex filename
  40027    4018     292   44337    ad31 sched.o.before
  40190    3842     292   44324    ad24 sched.o.after

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/kernel/sched_idletask.c b/kernel/sched_idletask.c
index 5ebf829cdd73..6e2ead41516e 100644
--- a/kernel/sched_idletask.c
+++ b/kernel/sched_idletask.c
@@ -57,7 +57,8 @@ static void set_curr_task_idle(struct rq *rq)
 /*
  * Simple, special scheduling class for the per-CPU idle tasks:
  */
-static struct sched_class idle_sched_class __read_mostly = {
+const struct sched_class idle_sched_class = {
+        /* .next is NULL */
         /* no enqueue/yield_task for idle tasks */
 
         /* dequeue is not valid, we print a debug message there: */