linux-kernel - [PATCH 2/3] sched/fair: Remove cfs_rq_tg

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Date:   Mon,  7 Sep 2020 11:17:16 +0200
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Qais Yousef <qais.yousef@....com>,
        Phil Auld <pauld@...hat.com>,
        Vincent Donnefort <vincent.donnefort@....com>
Subject: [PATCH 2/3] sched/fair: Remove cfs_rq_tg_path()

cfs_rq_tg_path() is used by a tracepoint-to traceevent (tp-2-te)
converter to format the path of a taskgroup or autogroup respectively.
It doesn't have any in-kernel users after the removal of the
sched_trace_cfs_rq_path() helper function.

cfs_rq_tg_path() can be coded in a tp-2-te converter.

Remove it from kernel/sched/fair.c.

Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....com>
---
 kernel/sched/fair.c  | 19 -------------------
 kernel/sched/sched.h |  3 ---
 2 files changed, 22 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index f7640af1dcaa..7b9b5ed3c506 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -285,19 +285,6 @@ static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp)
 	return grp->my_q;
 }
 
-static inline void cfs_rq_tg_path(struct cfs_rq *cfs_rq, char *path, int len)
-{
-	if (!path)
-		return;
-
-	if (cfs_rq && task_group_is_autogroup(cfs_rq->tg))
-		autogroup_path(cfs_rq->tg, path, len);
-	else if (cfs_rq && cfs_rq->tg->css.cgroup)
-		cgroup_path(cfs_rq->tg->css.cgroup, path, len);
-	else
-		strlcpy(path, "(null)", len);
-}
-
 static inline bool list_add_leaf_cfs_rq(struct cfs_rq *cfs_rq)
 {
 	struct rq *rq = rq_of(cfs_rq);
@@ -472,12 +459,6 @@ static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp)
 	return NULL;
 }
 
-static inline void cfs_rq_tg_path(struct cfs_rq *cfs_rq, char *path, int len)
-{
-	if (path)
-		strlcpy(path, "(null)", len);
-}
-
 static inline bool list_add_leaf_cfs_rq(struct cfs_rq *cfs_rq)
 {
 	return true;
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 28709f6b0975..5f2e9b396161 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -730,7 +730,6 @@ static inline long se_runnable(struct sched_entity *se)
 	else
 		return se->runnable_weight;
 }
-
 #else
 #define entity_is_task(se)	1
 
@@ -1579,7 +1578,6 @@ static inline void set_task_rq(struct task_struct *p, unsigned int cpu)
 	p->rt.parent = tg->rt_se[cpu];
 #endif
 }
-
 #else /* CONFIG_CGROUP_SCHED */
 
 static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { }
@@ -1587,7 +1585,6 @@ static inline struct task_group *task_group(struct task_struct *p)
 {
 	return NULL;
 }
-
 #endif /* CONFIG_CGROUP_SCHED */
 
 static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
-- 
2.17.1