sched: fix cpu hotplug, cleanup

[pandora-kernel.git] / kernel / sched_idletask.c

diff --git a/kernel/sched_idletask.c b/kernel/sched_idletask.c
index 6e2ead4..3a4f92d 100644 (file)
--- a/kernel/sched_idletask.c
+++ b/kernel/sched_idletask.c
@@ -5,6 +5,12 @@
  *  handled in sched_fair.c)
  */
 
+#ifdef CONFIG_SMP
+static int select_task_rq_idle(struct task_struct *p, int sync)
+{
+       return task_cpu(p); /* IDLE tasks as never migrated */
+}
+#endif /* CONFIG_SMP */
 /*
  * Idle tasks are unconditionally rescheduled:
  */
@@ -37,16 +43,25 @@ static void put_prev_task_idle(struct rq *rq, struct task_struct *prev)
 {
 }
 
+#ifdef CONFIG_SMP
 static unsigned long
 load_balance_idle(struct rq *this_rq, int this_cpu, struct rq *busiest,
-                       unsigned long max_nr_move, unsigned long max_load_move,
-                       struct sched_domain *sd, enum cpu_idle_type idle,
-                       int *all_pinned, int *this_best_prio)
+                 unsigned long max_load_move,
+                 struct sched_domain *sd, enum cpu_idle_type idle,
+                 int *all_pinned, int *this_best_prio)
+{
+       return 0;
+}
+
+static int
+move_one_task_idle(struct rq *this_rq, int this_cpu, struct rq *busiest,
+                  struct sched_domain *sd, enum cpu_idle_type idle)
 {
        return 0;
 }
+#endif
 
-static void task_tick_idle(struct rq *rq, struct task_struct *curr)
+static void task_tick_idle(struct rq *rq, struct task_struct *curr, int queued)
 {
 }
 
@@ -54,24 +69,61 @@ static void set_curr_task_idle(struct rq *rq)
 {
 }
 
+static void switched_to_idle(struct rq *rq, struct task_struct *p,
+                            int running)
+{
+       /* Can this actually happen?? */
+       if (running)
+               resched_task(rq->curr);
+       else
+               check_preempt_curr(rq, p);
+}
+
+static void prio_changed_idle(struct rq *rq, struct task_struct *p,
+                             int oldprio, int running)
+{
+       /* This can happen for hot plug CPUS */
+
+       /*
+        * Reschedule if we are currently running on this runqueue and
+        * our priority decreased, or if we are not currently running on
+        * this runqueue and our priority is higher than the current's
+        */
+       if (running) {
+               if (p->prio > oldprio)
+                       resched_task(rq->curr);
+       } else
+               check_preempt_curr(rq, p);
+}
+
 /*
  * Simple, special scheduling class for the per-CPU idle tasks:
  */
-const struct sched_class idle_sched_class = {
+static 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: */
        .dequeue_task           = dequeue_task_idle,
+#ifdef CONFIG_SMP
+       .select_task_rq         = select_task_rq_idle,
+#endif /* CONFIG_SMP */
 
        .check_preempt_curr     = check_preempt_curr_idle,
 
        .pick_next_task         = pick_next_task_idle,
        .put_prev_task          = put_prev_task_idle,
 
+#ifdef CONFIG_SMP
        .load_balance           = load_balance_idle,
+       .move_one_task          = move_one_task_idle,
+#endif
 
        .set_curr_task          = set_curr_task_idle,
        .task_tick              = task_tick_idle,
+
+       .prio_changed           = prio_changed_idle,
+       .switched_to            = switched_to_idle,
+
        /* no .task_new for idle tasks */
 };