linux-kernel - [PATCH] sched: Remove broken check for skip clock update

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Message-Id: <1357607254-511-1-git-send-email-fweisbec@gmail.com>
Date:	Tue,  8 Jan 2013 02:07:34 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH] sched: Remove broken check for skip clock update

rq->skip_clock_update shouldn't be negative. Thus the check
in put_prev_task() is useless.

It was probably intended to do the following check:

	if (prev->on_rq && !rq->skip_clock_update)

We only want to update the clock if the current task is
not voluntarily sleeping: otherwise deactivate_task()
already did the rq clock update in schedule(). But we want
to ignore that update if a ttwu did it for us, in which case
rq->skip_clock_update is 1.

But update_rq_clock() already takes care of that so we
can just remove the broken condition.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
---
 kernel/sched/core.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 15ba35e..8dfc461 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2886,7 +2886,7 @@ static inline void schedule_debug(struct task_struct *prev)
 
 static void put_prev_task(struct rq *rq, struct task_struct *prev)
 {
-	if (prev->on_rq || rq->skip_clock_update < 0)
+	if (prev->on_rq)
 		update_rq_clock(rq);
 	prev->sched_class->put_prev_task(rq, prev);
 }
-- 
1.7.5.4

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