linux-kernel - [PATCH v7 3/3] sched/headers: Move sched_rt_entity::back to under the CONFIG_RT_GROUP

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Message-Id: <20231009122244.2394336-4-yajun.deng@linux.dev>
Date:   Mon,  9 Oct 2023 20:22:44 +0800
From:   Yajun Deng <yajun.deng@...ux.dev>
To:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, vschneid@...hat.com
Cc:     linux-kernel@...r.kernel.org, Yajun Deng <yajun.deng@...ux.dev>
Subject: [PATCH v7 3/3] sched/headers: Move sched_rt_entity::back to under the CONFIG_RT_GROUP_SCHED block

We already remove the call to the 'back' member when CONFIG_RT_GROUP_SCHED
is disabled.

It's safe to move sched_rt_entity::back to under the
CONFIG_RT_GROUP_SCHED block, it would save a few bytes.

Signed-off-by: Yajun Deng <yajun.deng@...ux.dev>
---
v7: Only move back under the CONFIG_RT_GROUP_SCHED block.
v6: Independent patch.
v5: Resend it.
v4: Missed rt_se = root in dequeue_rt_stack().
v3: Keep parent is NULL in init_tg_rt_entry().
v2: Add WARN_ON_ONCE in init_tg_rt_entry().
v1: https://lore.kernel.org/all/20230801062714.3424299-1-yajun.deng@linux.dev/
---
 include/linux/sched.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 292c31697248..d0fe56603e60 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -597,8 +597,8 @@ struct sched_rt_entity {
 	unsigned short			on_rq;
 	unsigned short			on_list;
 
-	struct sched_rt_entity		*back;
 #ifdef CONFIG_RT_GROUP_SCHED
+	struct sched_rt_entity		*back;
 	struct sched_rt_entity		*parent;
 	/* rq on which this entity is (to be) queued: */
 	struct rt_rq			*rt_rq;
-- 
2.25.1