linux-kernel - Re: [tip:sched/urgent] sched: Hide runqueues from direct refer at source code level

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Message-Id: <20090618.191448.886429908004553840.mitake@dcl.info.waseda.ac.jp>
Date:	Thu, 18 Jun 2009 19:14:48 +0900 (JST)
From:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
To:	mingo@...e.hu
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/urgent] sched: Hide runqueues from direct refer at
 source code level

From: Ingo Molnar <mingo@...e.hu>
Subject: Re: [tip:sched/urgent] sched: Hide runqueues from direct refer at source code level
Date: Wed, 17 Jun 2009 18:31:11 +0200

> ition: inline
> Subject: Re: [tip:sched/urgent] sched: Hide runqueues from direct refer at source code level
> From: Ingo Molnar <mingo@...e.hu>
> To: mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
> 	mitake@....info.waseda.ac.jp, tglx@...utronix.de
> Cc: linux-tip-commits@...r.kernel.org
> Date: Wed, 17 Jun 2009 18:31:11 +0200
> User-Agent: Mutt/1.5.18 (2008-05-17)
> Received-SPF: neutral (mx2.mail.elte.hu: 157.181.1.14 is neither permitted nor denied by domain of elte.hu) client-ip=157.181.1.14; envelope-from=mingo@...e.hu; helo=elvis.elte.hu;
> X-Mew: tab/spc characters on Subject: are simplified.
> 
> 
> * tip-bot for Hitoshi Mitake <mitake@....info.waseda.ac.jp> wrote:
> 
> > --- a/kernel/sched.c
> > +++ b/kernel/sched.c
> > @@ -6630,7 +6630,7 @@ EXPORT_SYMBOL(yield);
> >   */
> >  void __sched io_schedule(void)
> >  {
> > -	struct rq *rq = &__raw_get_cpu_var(runqueues);
> > +	struct rq *rq = this_rq();
> >  
> >  	delayacct_blkio_start();
> >  	atomic_inc(&rq->nr_iowait);
> > @@ -6642,7 +6642,7 @@ EXPORT_SYMBOL(io_schedule);
> >  
> >  long __sched io_schedule_timeout(long timeout)
> >  {
> > -	struct rq *rq = &__raw_get_cpu_var(runqueues);
> > +	struct rq *rq = this_rq();
> >  	long ret;
> 
> I removed these two changes. Did you notice the __raw prefix?
> 
> 	Ingo
> 

Thanks for your fix, I didn't notice...
I wrote a patch to fix these two points.

After applying this patch,
all direct reference to runqueues is in macros. How is this?

Signed-off-by: Hitoshi Mitake <mitake@....info.waseda.ac.jp>

diff --git a/kernel/sched.c b/kernel/sched.c
index 8ec9d13..e2ca8c1 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -692,6 +692,7 @@ static inline int cpu_of(struct rq *rq)
 #define this_rq()		(&__get_cpu_var(runqueues))
 #define task_rq(p)		cpu_rq(task_cpu(p))
 #define cpu_curr(cpu)		(cpu_rq(cpu)->curr)
+#define raw_rq()		(&__raw_get_cpu_var(runqueues))
 
 inline void update_rq_clock(struct rq *rq)
 {
@@ -6625,7 +6626,7 @@ EXPORT_SYMBOL(yield);
  */
 void __sched io_schedule(void)
 {
-	struct rq *rq = &__raw_get_cpu_var(runqueues);
+	struct rq *rq = raw_rq();
 
 	delayacct_blkio_start();
 	atomic_inc(&rq->nr_iowait);
@@ -6637,7 +6638,7 @@ EXPORT_SYMBOL(io_schedule);
 
 long __sched io_schedule_timeout(long timeout)
 {
-	struct rq *rq = &__raw_get_cpu_var(runqueues);
+	struct rq *rq = raw_rq();
 	long ret;
 
 	delayacct_blkio_start();
--
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