sched/fair: Introduce set_curr_task() helper

Now that the ia64 only set_curr_task() symbol is gone, provide a
helper just like put_prev_task().

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 01b5189..fc6ae04 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1274,6 +1274,11 @@
 	prev->sched_class->put_prev_task(rq, prev);
 }
 
+static inline void set_curr_task(struct rq *rq, struct task_struct *curr)
+{
+	curr->sched_class->set_curr_task(rq);
+}
+
 #define sched_class_highest (&stop_sched_class)
 #define for_each_class(class) \
    for (class = sched_class_highest; class; class = class->next)