sched/fair: Move max_cfs_quota_period decl and default_cfs_period() def from fair.c to sched.h

JIRA: https://issues.redhat.com/browse/RHEL-110301

commit d403a36
Author: Tejun Heo <tj@kernel.org>
Date:   Fri Jun 13 15:23:27 2025 -1000

    sched/fair: Move max_cfs_quota_period decl and default_cfs_period() def from fair.c to sched.h

    max_cfs_quota_period is defined in core.c but has a declaration in fair.c.
    Move the declaration to kernel/sched/sched.h. Also, move
    default_cfs_period() from fair.c to sched.h. No functional changes.

    Signed-off-by: Tejun Heo <tj@kernel.org>
    Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
    Link: https://lore.kernel.org/r/20250614012346.2358261-2-tj@kernel.org

Signed-off-by: Phil Auld <pauld@redhat.com>

Author: auldp

kernel/sched/fair.c

@@ -5611,15 +5611,6 @@ void cfs_bandwidth_usage_inc(void) {}
 void cfs_bandwidth_usage_dec(void) {}
 #endif /* !CONFIG_JUMP_LABEL */
 
-/*
- * default period for cfs group bandwidth.
- * default: 0.1s, units: nanoseconds
- */
-static inline u64 default_cfs_period(void)
-{
-	return 100000000ULL;
-}
-
 static inline u64 sched_cfs_bandwidth_slice(void)
 {
 	return (u64)sysctl_sched_cfs_bandwidth_slice * NSEC_PER_USEC;
@@ -6394,8 +6385,6 @@ static enum hrtimer_restart sched_cfs_slack_timer(struct hrtimer *timer)
 	return HRTIMER_NORESTART;
 }
 
-extern const u64 max_cfs_quota_period;
-
 static enum hrtimer_restart sched_cfs_period_timer(struct hrtimer *timer)
 {
 	struct cfs_bandwidth *cfs_b =

kernel/sched/sched.h

@@ -403,6 +403,19 @@ static inline bool dl_server_active(struct sched_dl_entity *dl_se)
 
 extern struct list_head task_groups;
 
+#ifdef CONFIG_CFS_BANDWIDTH
+extern const u64 max_cfs_quota_period;
+
+/*
+ * default period for cfs group bandwidth.
+ * default: 0.1s, units: nanoseconds
+ */
+static inline u64 default_cfs_period(void)
+{
+	return 100000000ULL;
+}
+#endif /* CONFIG_CFS_BANDWIDTH */
+
 struct cfs_bandwidth {
 #ifdef CONFIG_CFS_BANDWIDTH
 	raw_spinlock_t		lock;