sched: revert recent removal of set_curr_task()

Revert removal of set_curr_task.
Use put_prev_task/set_curr_task when changing groups/policies

Signed-off-by: Srivatsa Vaddagiri < vatsa@linux.vnet.ibm.com>
Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>

1 files changed, 26 insertions, 8 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 72c936d3e332..ee7ac71b12f8 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3916,7 +3916,7 @@ EXPORT_SYMBOL(sleep_on_timeout);
 void rt_mutex_setprio(struct task_struct *p, int prio)
 {
 	unsigned long flags;
-	int oldprio, on_rq;
+	int oldprio, on_rq, running;
 	struct rq *rq;
 
 	BUG_ON(prio < 0 || prio > MAX_PRIO);
@@ -3926,8 +3926,12 @@ void rt_mutex_setprio(struct task_struct *p, int prio)
 
 	oldprio = p->prio;
 	on_rq = p->se.on_rq;
-	if (on_rq)
+	running = task_running(rq, p);
+	if (on_rq) {
 		dequeue_task(rq, p, 0);
+		if (running)
+			p->sched_class->put_prev_task(rq, p);
+	}
 
 	if (rt_prio(prio))
 		p->sched_class = &rt_sched_class;
@@ -3937,13 +3941,15 @@ void rt_mutex_setprio(struct task_struct *p, int prio)
 	p->prio = prio;
 
 	if (on_rq) {
+		if (running)
+			p->sched_class->set_curr_task(rq);
 		enqueue_task(rq, p, 0);
 		/*
 		 * 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 (task_running(rq, p)) {
+		if (running) {
 			if (p->prio > oldprio)
 				resched_task(rq->curr);
 		} else {
@@ -4149,7 +4155,7 @@ __setscheduler(struct rq *rq, struct task_struct *p, int policy, int prio)
 int sched_setscheduler(struct task_struct *p, int policy,
 		       struct sched_param *param)
 {
-	int retval, oldprio, oldpolicy = -1, on_rq;
+	int retval, oldprio, oldpolicy = -1, on_rq, running;
 	unsigned long flags;
 	struct rq *rq;
 
@@ -4231,20 +4237,26 @@ recheck:
 	}
 	update_rq_clock(rq);
 	on_rq = p->se.on_rq;
-	if (on_rq)
+	running = task_running(rq, p);
+	if (on_rq) {
 		deactivate_task(rq, p, 0);
+		if (running)
+			p->sched_class->put_prev_task(rq, p);
+	}
 
 	oldprio = p->prio;
 	__setscheduler(rq, p, policy, param->sched_priority);
 
 	if (on_rq) {
+		if (running)
+			p->sched_class->set_curr_task(rq);
 		activate_task(rq, p, 0);
 		/*
 		 * 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 (task_running(rq, p)) {
+		if (running) {
 			if (p->prio > oldprio)
 				resched_task(rq->curr);
 		} else {
@@ -6845,13 +6857,19 @@ static void sched_move_task(struct container_subsys *ss, struct container *cont,
 	running = task_running(rq, tsk);
 	on_rq = tsk->se.on_rq;
 
-	if (on_rq)
+	if (on_rq) {
 		dequeue_task(rq, tsk, 0);
+		if (unlikely(running))
+			tsk->sched_class->put_prev_task(rq, tsk);
+	}
 
 	set_task_cfs_rq(tsk);
 
-	if (on_rq)
+	if (on_rq) {
+		if (unlikely(running))
+			tsk->sched_class->set_curr_task(rq);
 		enqueue_task(rq, tsk, 0);
+	}
 
 done:
 	task_rq_unlock(rq, &flags);