sched/smp: Use the SMP version of the deadline scheduling class

Simplify the scheduler by making CONFIG_SMP=y code
in prio_changed_dl() unconditional.

Signed-off-by: Ingo Molnar <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Cc: Dietmar Eggemann <[email protected]>
Cc: Juri Lelli <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Sebastian Andrzej Siewior <[email protected]>
Cc: Shrikanth Hegde <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Valentin Schneider <[email protected]>
Cc: Vincent Guittot <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Ingo Molnar

kernel/sched/deadline.c

@@ -3005,7 +3005,6 @@ static void prio_changed_dl(struct rq *rq, struct task_struct *p,
 	if (!task_on_rq_queued(p))
 		return;
 
-#ifdef CONFIG_SMP
 	/*
 	 * This might be too much, but unfortunately
 	 * we don't have the old deadline value, and
@@ -3034,13 +3033,6 @@ static void prio_changed_dl(struct rq *rq, struct task_struct *p,
 		    dl_time_before(p->dl.deadline, rq->curr->dl.deadline))
 			resched_curr(rq);
 	}
-#else /* !CONFIG_SMP: */
-	/*
-	 * We don't know if p has a earlier or later deadline, so let's blindly
-	 * set a (maybe not needed) rescheduling point.
-	 */
-	resched_curr(rq);
-#endif /* !CONFIG_SMP */
 }
 
 #ifdef CONFIG_SCHED_CORE