[PATCH -next] sched/fair: Fix unused function warning

[YueHaibing]

while CONFIG_NO_HZ_COMMON is not enabled, gcc warn this:

kernel/sched/fair.c:8398:13: warning: ‘update_nohz_stats’ defined but not used [-Wunused-function]
 static bool update_nohz_stats(struct rq *rq)
             ^~~~~~~~~~~~~~~~~

Move update_nohz_stats() to #ifdef block fix this.

Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 kernel/sched/fair.c | 40 ++++++++++++++++++----------------------
 1 file changed, 18 insertions(+), 22 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 6d73bdbb2d40..c7a7ef97d167 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -8395,28 +8395,6 @@ group_type group_classify(unsigned int imbalance_pct,
 	return group_has_spare;
 }
 
-static bool update_nohz_stats(struct rq *rq)
-{
-#ifdef CONFIG_NO_HZ_COMMON
-	unsigned int cpu = rq->cpu;
-
-	if (!rq->has_blocked_load)
-		return false;
-
-	if (!cpumask_test_cpu(cpu, nohz.idle_cpus_mask))
-		return false;
-
-	if (!time_after(jiffies, READ_ONCE(rq->last_blocked_load_update_tick)))
-		return true;
-
-	update_blocked_averages(cpu);
-
-	return rq->has_blocked_load;
-#else
-	return false;
-#endif
-}
-
 /**
  * update_sg_lb_stats - Update sched_group's statistics for load balancing.
  * @env: The load balancing environment.
@@ -10097,6 +10075,24 @@ static inline int on_null_domain(struct rq *rq)
 }
 
 #ifdef CONFIG_NO_HZ_COMMON
+static bool update_nohz_stats(struct rq *rq)
+{
+	unsigned int cpu = rq->cpu;
+
+	if (!rq->has_blocked_load)
+		return false;
+
+	if (!cpumask_test_cpu(cpu, nohz.idle_cpus_mask))
+		return false;
+
+	if (!time_after(jiffies, READ_ONCE(rq->last_blocked_load_update_tick)))
+		return true;
+
+	update_blocked_averages(cpu);
+
+	return rq->has_blocked_load;
+}
+
 /*
  * idle load balancing details
  * - When one of the busy CPUs notice that there may be an idle rebalancing
-- 
2.17.1