linux-kernel - [tip:sched/core] sched: Simplify the idle scheduling class

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Date:	Wed, 26 Jan 2011 12:13:52 GMT
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:sched/core] sched: Simplify the idle scheduling class

Commit-ID:  a8941d7ec81678fb69aea7183338175f112f3e0d
Gitweb:     http://git.kernel.org/tip/a8941d7ec81678fb69aea7183338175f112f3e0d
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Tue, 25 Jan 2011 16:30:03 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 26 Jan 2011 12:33:22 +0100

sched: Simplify the idle scheduling class

Since commit 48c5ccae88dcd (sched: Simplify cpu-hot-unplug task
migration) this should no longer happen, so remove the code.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched_idletask.c |   23 ++++-------------------
 1 files changed, 4 insertions(+), 19 deletions(-)

diff --git a/kernel/sched_idletask.c b/kernel/sched_idletask.c
index 9fa0f40..41eb62a 100644
--- a/kernel/sched_idletask.c
+++ b/kernel/sched_idletask.c
@@ -52,31 +52,16 @@ static void set_curr_task_idle(struct rq *rq)
 {
 }
 
-static void switched_to_idle(struct rq *rq, struct task_struct *p,
-			     int running)
+static void
+switched_to_idle(struct rq *rq, struct task_struct *p, int running)
 {
-	/* Can this actually happen?? */
-	if (running)
-		resched_task(rq->curr);
-	else
-		check_preempt_curr(rq, p, 0);
+	BUG();
 }
 
 static void prio_changed_idle(struct rq *rq, struct task_struct *p,
 			      int oldprio, int running)
 {
-	/* This can happen for hot plug CPUS */
-
-	/*
-	 * Reschedule if we are currently running on this runqueue and
-	 * our priority decreased, or if we are not currently running on
-	 * this runqueue and our priority is higher than the current's
-	 */
-	if (running) {
-		if (p->prio > oldprio)
-			resched_task(rq->curr);
-	} else
-		check_preempt_curr(rq, p, 0);
+	BUG();
 }
 
 static unsigned int get_rr_interval_idle(struct rq *rq, struct task_struct *task)
--
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