linux-kernel - [PATCH 1/1] sched: remove duplicated init_task's preempt

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Message-Id: <1471339568-5790-1-git-send-email-iamyooon@gmail.com>
Date:	Tue, 16 Aug 2016 18:26:08 +0900
From:	"seokhoon.yoon" <iamyooon@...il.com>
To:	Ingo Molnar <mingo@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, iamyooon@...il.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] sched: remove duplicated init_task's preempt_notifiers init

init_task's preempt_notifiers is initialized at two times.

1) sched_init()
   -> INIT_HLIST_HEAD(&init_task.preempt_notifiers)
2) sched_init()
   -> init_idle(current,) <--- current task is init_task at this time
    -> __sched_fork(,current)
     -> INIT_HLIST_HEAD(&p->preempt_notifiers)

I think first one is needless, remove it.

Signed-off-by: seokhoon.yoon <iamyooon@...il.com>
---
 kernel/sched/core.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 5c883fe..5760f62 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7482,10 +7482,6 @@ void __init sched_init(void)
 
 	set_load_weight(&init_task);
 
-#ifdef CONFIG_PREEMPT_NOTIFIERS
-	INIT_HLIST_HEAD(&init_task.preempt_notifiers);
-#endif
-
 	/*
 	 * The boot idle thread does lazy MMU switching as well:
 	 */
-- 
1.9.1