[PATCH] sched: cleanup adjusting sched_class

From: Hiroshi Shimamoto
Date: Mon Sep 24 2007 - 16:52:15 EST

Hi Ingo and Dmitry,

I made a clean-up patch about fixing invalid sched_class use.

Dmitry, could you please review and sign it?

The adjusting sched_class is a missing part of the already existing
"do not leak PI boosting priority to the child" at the sched_fork().
This patch moves the adjusting sched_class from wake_up_new_task()
to sched_fork().

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@xxxxxxxxxxxxx>

diff --git a/kernel/sched.c b/kernel/sched.c
index 6107a0c..8862761 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1641,6 +1641,8 @@ void sched_fork(struct task_struct *p, int clone_flags)
* Make sure we do not leak PI boosting priority to the child:
p->prio = current->normal_prio;
+ if (!rt_prio(p->prio))
+ p->sched_class = &fair_sched_class;

if (likely(sched_info_on()))
@@ -1682,11 +1684,6 @@ void fastcall wake_up_new_task(struct task_struct *p, unsigned long clone_flags)

p->prio = effective_prio(p);

- if (rt_prio(p->prio))
- p->sched_class = &rt_sched_class;
- else
- p->sched_class = &fair_sched_class;
if (!p->sched_class->task_new || !sysctl_sched_child_runs_first ||
(clone_flags & CLONE_VM) || task_cpu(p) != this_cpu ||
!current->se.on_rq) {

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