linux-kernel - [RFC PATCH v2 2/5] sched: define task

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Date:   Mon, 23 Nov 2020 20:58:05 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     mgorman@...e.de, mingo@...hat.com, peterz@...radead.org,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        bristot@...hat.com
Cc:     linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
        Yafang Shao <laoar.shao@...il.com>
Subject: [RFC PATCH v2 2/5] sched: define task_of() as a common helper

task_of() is used to get task_struct from sched_entity. As sched_entity
in struct task_struct can be used by all sched class, we'd better move
this macro into sched.h, then it can be used by all sched class.

Signed-off-by: Yafang Shao <laoar.shao@...il.com>
---
 kernel/sched/fair.c  | 11 -----------
 kernel/sched/sched.h |  8 ++++++++
 2 files changed, 8 insertions(+), 11 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 8ff1daa3d9bb..59e454cae3be 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -259,12 +259,6 @@ const struct sched_class fair_sched_class;
  */
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
-static inline struct task_struct *task_of(struct sched_entity *se)
-{
-	SCHED_WARN_ON(!entity_is_task(se));
-	return container_of(se, struct task_struct, se);
-}
-
 /* Walk up scheduling entities hierarchy */
 #define for_each_sched_entity(se) \
 		for (; se; se = se->parent)
@@ -446,11 +440,6 @@ find_matching_se(struct sched_entity **se, struct sched_entity **pse)
 
 #else	/* !CONFIG_FAIR_GROUP_SCHED */
 
-static inline struct task_struct *task_of(struct sched_entity *se)
-{
-	return container_of(se, struct task_struct, se);
-}
-
 #define for_each_sched_entity(se) \
 		for (; se; se = NULL)
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 871544bb9a38..9a4576ccf3d7 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2636,4 +2636,12 @@ static inline bool is_per_cpu_kthread(struct task_struct *p)
 void swake_up_all_locked(struct swait_queue_head *q);
 void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait);
 
+static inline struct task_struct *task_of(struct sched_entity *se)
+{
+#ifdef CONFIG_FAIR_GROUP_SCHED
+	SCHED_WARN_ON(!entity_is_task(se));
+#endif
+	return container_of(se, struct task_struct, se);
+}
+
 #endif	/* _KERNEL_SCHED_SCHED_H */
-- 
2.18.4