sched/smp: Use the SMP version of scheduler debugging data

Simplify the scheduler by making CONFIG_SMP=y debug output
unconditional.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Shrikanth Hegde <sshegde@linux.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lore.kernel.org/r/20250528080924.2273858-31-mingo@kernel.org

Author: ingomolnar

kernel/sched/debug.c

@@ -169,8 +169,6 @@ static const struct file_operations sched_feat_fops = {
 	.release	= single_release,
 };
 
-#ifdef CONFIG_SMP
-
 static ssize_t sched_scaling_write(struct file *filp, const char __user *ubuf,
 				   size_t cnt, loff_t *ppos)
 {
@@ -217,8 +215,6 @@ static const struct file_operations sched_scaling_fops = {
 	.release	= single_release,
 };
 
-#endif /* CONFIG_SMP */
-
 #ifdef CONFIG_PREEMPT_DYNAMIC
 
 static ssize_t sched_dynamic_write(struct file *filp, const char __user *ubuf,
@@ -511,15 +507,13 @@ static __init int sched_init_debug(void)
 	debugfs_create_u32("latency_warn_ms", 0644, debugfs_sched, &sysctl_resched_latency_warn_ms);
 	debugfs_create_u32("latency_warn_once", 0644, debugfs_sched, &sysctl_resched_latency_warn_once);
 
-#ifdef CONFIG_SMP
 	debugfs_create_file("tunable_scaling", 0644, debugfs_sched, NULL, &sched_scaling_fops);
 	debugfs_create_u32("migration_cost_ns", 0644, debugfs_sched, &sysctl_sched_migration_cost);
 	debugfs_create_u32("nr_migrate", 0644, debugfs_sched, &sysctl_sched_nr_migrate);
 
 	sched_domains_mutex_lock();
 	update_sched_domain_debugfs();
 	sched_domains_mutex_unlock();
-#endif /* CONFIG_SMP */
 
 #ifdef CONFIG_NUMA_BALANCING
 	numa = debugfs_create_dir("numa_balancing", debugfs_sched);
@@ -685,11 +679,9 @@ static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group
 	}
 
 	P(se->load.weight);
-#ifdef CONFIG_SMP
 	P(se->avg.load_avg);
 	P(se->avg.util_avg);
 	P(se->avg.runnable_avg);
-#endif /* CONFIG_SMP */
 
 #undef PN_SCHEDSTAT
 #undef PN
@@ -849,7 +841,6 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 	SEQ_printf(m, "  .%-30s: %d\n", "h_nr_queued", cfs_rq->h_nr_queued);
 	SEQ_printf(m, "  .%-30s: %d\n", "h_nr_idle", cfs_rq->h_nr_idle);
 	SEQ_printf(m, "  .%-30s: %ld\n", "load", cfs_rq->load.weight);
-#ifdef CONFIG_SMP
 	SEQ_printf(m, "  .%-30s: %lu\n", "load_avg",
 			cfs_rq->avg.load_avg);
 	SEQ_printf(m, "  .%-30s: %lu\n", "runnable_avg",
@@ -870,7 +861,6 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 	SEQ_printf(m, "  .%-30s: %ld\n", "tg_load_avg",
 			atomic_long_read(&cfs_rq->tg->load_avg));
 #endif /* CONFIG_FAIR_GROUP_SCHED */
-#endif /* CONFIG_SMP */
 #ifdef CONFIG_CFS_BANDWIDTH
 	SEQ_printf(m, "  .%-30s: %d\n", "throttled",
 			cfs_rq->throttled);
@@ -967,12 +957,10 @@ do {									\
 #undef P
 #undef PN
 
-#ifdef CONFIG_SMP
 #define P64(n) SEQ_printf(m, "  .%-30s: %Ld\n", #n, rq->n);
 	P64(avg_idle);
 	P64(max_idle_balance_cost);
 #undef P64
-#endif /* CONFIG_SMP */
 
 #define P(n) SEQ_printf(m, "  .%-30s: %d\n", #n, schedstat_val(rq->n));
 	if (schedstat_enabled()) {
@@ -1242,7 +1230,6 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
 	__PS("nr_involuntary_switches", p->nivcsw);
 
 	P(se.load.weight);
-#ifdef CONFIG_SMP
 	P(se.avg.load_sum);
 	P(se.avg.runnable_sum);
 	P(se.avg.util_sum);
@@ -1251,7 +1238,6 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
 	P(se.avg.util_avg);
 	P(se.avg.last_update_time);
 	PM(se.avg.util_est, ~UTIL_AVG_UNCHANGED);
-#endif /* CONFIG_SMP */
 #ifdef CONFIG_UCLAMP_TASK
 	__PS("uclamp.min", p->uclamp_req[UCLAMP_MIN].value);
 	__PS("uclamp.max", p->uclamp_req[UCLAMP_MAX].value);