linux-kernel - [PATCH] sched/fair: fix a -Wunused-function warning

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Date:   Mon, 16 Sep 2019 17:19:35 -0400
From:   Qian Cai <cai@....pw>
To:     mingo@...hat.com, peterz@...radead.org
Cc:     juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, linux-kernel@...r.kernel.org,
        Qian Cai <cai@....pw>
Subject: [PATCH] sched/fair: fix a -Wunused-function warning

cfs_rq_clock_task() was first introduced in the commit f1b17280efbd
("sched: Maintain runnable averages across throttled periods"). Over
time, it has been graduately removed by the commits like,

d31b1a66cbe0 ("sched/fair: Factorize PELT update")
23127296889f ("sched/fair: Update scale invariance of PELT")

Today, there is no single user of it, so it could be safely removed.

Signed-off-by: Qian Cai <cai@....pw>
---
 kernel/sched/fair.c | 16 ----------------
 1 file changed, 16 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 500f5db0de0b..0d0b812b6c49 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -749,7 +749,6 @@ void init_entity_runnable_average(struct sched_entity *se)
 	/* when this task enqueue'ed, it will contribute to its cfs_rq's load_avg */
 }
 
-static inline u64 cfs_rq_clock_task(struct cfs_rq *cfs_rq);
 static void attach_entity_cfs_rq(struct sched_entity *se);
 
 /*
@@ -4379,15 +4378,6 @@ static inline struct cfs_bandwidth *tg_cfs_bandwidth(struct task_group *tg)
 	return &tg->cfs_bandwidth;
 }
 
-/* rq->task_clock normalized against any time this cfs_rq has spent throttled */
-static inline u64 cfs_rq_clock_task(struct cfs_rq *cfs_rq)
-{
-	if (unlikely(cfs_rq->throttle_count))
-		return cfs_rq->throttled_clock_task - cfs_rq->throttled_clock_task_time;
-
-	return rq_clock_task(rq_of(cfs_rq)) - cfs_rq->throttled_clock_task_time;
-}
-
 /* returns 0 on failure to allocate runtime */
 static int assign_cfs_rq_runtime(struct cfs_rq *cfs_rq)
 {
@@ -4524,7 +4514,6 @@ static int tg_unthrottle_up(struct task_group *tg, void *data)
 
 	cfs_rq->throttle_count--;
 	if (!cfs_rq->throttle_count) {
-		/* adjust cfs_rq_clock_task() */
 		cfs_rq->throttled_clock_task_time += rq_clock_task(rq) -
 					     cfs_rq->throttled_clock_task;
 
@@ -5135,11 +5124,6 @@ static inline bool cfs_bandwidth_used(void)
 	return false;
 }
 
-static inline u64 cfs_rq_clock_task(struct cfs_rq *cfs_rq)
-{
-	return rq_clock_task(rq_of(cfs_rq));
-}
-
 static void account_cfs_rq_runtime(struct cfs_rq *cfs_rq, u64 delta_exec) {}
 static bool check_cfs_rq_runtime(struct cfs_rq *cfs_rq) { return false; }
 static void check_enqueue_throttle(struct cfs_rq *cfs_rq) {}
-- 
1.8.3.1