sched/smp: Use the SMP version of schedstats

Simplify the scheduler by making CONFIG_SMP=y schedstats
debugging output 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/stats.c

@@ -115,10 +115,8 @@ static int show_schedstat(struct seq_file *seq, void *v)
 		seq_printf(seq, "timestamp %lu\n", jiffies);
 	} else {
 		struct rq *rq;
-#ifdef CONFIG_SMP
 		struct sched_domain *sd;
 		int dcount = 0;
-#endif
 		cpu = (unsigned long)(v - 2);
 		rq = cpu_rq(cpu);
 
@@ -133,7 +131,6 @@ static int show_schedstat(struct seq_file *seq, void *v)
 
 		seq_printf(seq, "\n");
 
-#ifdef CONFIG_SMP
 		/* domain-specific stats */
 		rcu_read_lock();
 		for_each_domain(cpu, sd) {
@@ -164,7 +161,6 @@ static int show_schedstat(struct seq_file *seq, void *v)
 			    sd->ttwu_move_balance);
 		}
 		rcu_read_unlock();
-#endif /* CONFIG_SMP */
 	}
 	return 0;
 }