[PATCH 2/3] sched/rt: Move group schedulability check to sched_rt_global_validate()

["Michal Koutný" <mkoutny@suse.com>]

The sched_rt_global_constraints() function is a remnant that used to set
up global RT throttling but that is no more since commit 5f6bd380c7bdb
("sched/rt: Remove default bandwidth control") and the function ended up
only doing schedulability check.
Move the check into the validation function where it fits better.
(The order of validations sched_dl_global_validate() and
sched_rt_global_validate() shouldn't matter.)

Signed-off-by: Michal Koutný <mkoutny@suse.com>
---
 kernel/sched/rt.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 2dfdf2d9471be..c621e61568359 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -2810,15 +2810,7 @@ long sched_group_rt_period(struct task_group *tg)
 #ifdef CONFIG_SYSCTL
 static int sched_rt_global_constraints(void)
 {
-	int ret = 0;
-	if (!rt_group_sched_enabled())
-		return ret;
-
-	mutex_lock(&rt_constraints_mutex);
-	ret = __rt_schedulable(NULL, 0, 0);
-	mutex_unlock(&rt_constraints_mutex);
-
-	return ret;
+	return 0;
 }
 #endif /* CONFIG_SYSCTL */
 
@@ -2850,7 +2842,16 @@ static int sched_rt_global_validate(void)
 			NSEC_PER_USEC > max_rt_runtime)))
 		return -EINVAL;
 
-	return 0;
+	int ret = 0;
+#ifdef CONFIG_RT_GROUP_SCHED
+	if (!rt_group_sched_enabled())
+		return ret;
+
+	mutex_lock(&rt_constraints_mutex);
+	ret = __rt_schedulable(NULL, 0, 0);
+	mutex_unlock(&rt_constraints_mutex);
+#endif
+	return ret;
 }
 
 static void sched_rt_do_global(void)

-- 
2.52.0