Re: sched: add CONFIG_SMP consistency

[Henrik Austad <henrik@austad.us>]

On Wednesday 22 October 2008 09:36:40 Ingo Molnar wrote:
> 
> * Li Zefan <lizf@cn.fujitsu.com> wrote:
> 
> > How about the following patch?
> 
> i've applied it in the form below. Peter, does it look good to you too?
> 
> 	Ingo

FWIW:
Acked-by Henrik Austad <henrik@austad.us>

Not boot-tested, just build-tested.

> 
> -------------->
> From 667ff69f5a248fde6cf871f2c9c5c5d2aa182e71 Mon Sep 17 00:00:00 2001
> From: Li Zefan <lizf@cn.fujitsu.com>
> Date: Wed, 22 Oct 2008 15:25:26 +0800
> Subject: [PATCH] sched: add CONFIG_SMP consistency
> 
> a patch from Henrik Austad did this:
> 
> >> Do not declare select_task_rq as part of sched_class when CONFIG_SMP is
> >> not set.
> 
> Peter observed:
> 
> > While a proper cleanup, could you do it by re-arranging the methods so
> > as to not create an additional ifdef?
> 
> Do not declare select_task_rq and some other methods as part of sched_class
> when CONFIG_SMP is not set.
> 
> Also gather those methods to avoid CONFIG_SMP mess.
> 
> Idea-by: Henrik Austad <henrik.austad@gmail.com>

can you change this to henrik@austad.us? (sorry for error in first patch.. :-))

> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
> Acked-by: Peter Zijlstra <peterz@infradead.org>
> Signed-off-by: Ingo Molnar <mingo@elte.hu>
> ---
>  include/linux/sched.h   |   12 +++++++-----
>  kernel/sched_fair.c     |    5 ++---
>  kernel/sched_idletask.c |    5 ++---
>  kernel/sched_rt.c       |    5 ++---
>  4 files changed, 13 insertions(+), 14 deletions(-)
> 
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index 4f59c8e..c05b45f 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -897,7 +897,6 @@ struct sched_class {
>  	void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
>  	void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
>  	void (*yield_task) (struct rq *rq);
> -	int  (*select_task_rq)(struct task_struct *p, int sync);
>  
>  	void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int sync);
>  
> @@ -905,6 +904,8 @@ struct sched_class {
>  	void (*put_prev_task) (struct rq *rq, struct task_struct *p);
>  
>  #ifdef CONFIG_SMP
> +	int  (*select_task_rq)(struct task_struct *p, int sync);
> +
>  	unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
>  			struct rq *busiest, unsigned long max_load_move,
>  			struct sched_domain *sd, enum cpu_idle_type idle,
> @@ -916,16 +917,17 @@ struct sched_class {
>  	void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
>  	void (*post_schedule) (struct rq *this_rq);
>  	void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
> -#endif
>  
> -	void (*set_curr_task) (struct rq *rq);
> -	void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
> -	void (*task_new) (struct rq *rq, struct task_struct *p);
>  	void (*set_cpus_allowed)(struct task_struct *p,
>  				 const cpumask_t *newmask);
>  
>  	void (*rq_online)(struct rq *rq);
>  	void (*rq_offline)(struct rq *rq);
> +#endif
> +
> +	void (*set_curr_task) (struct rq *rq);
> +	void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
> +	void (*task_new) (struct rq *rq, struct task_struct *p);
>  
>  	void (*switched_from) (struct rq *this_rq, struct task_struct *task,
>  			       int running);
> diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
> index a0aa38b..8de48a5 100644
> --- a/kernel/sched_fair.c
> +++ b/kernel/sched_fair.c
> @@ -1593,9 +1593,6 @@ static const struct sched_class fair_sched_class = {
>  	.enqueue_task		= enqueue_task_fair,
>  	.dequeue_task		= dequeue_task_fair,
>  	.yield_task		= yield_task_fair,
> -#ifdef CONFIG_SMP
> -	.select_task_rq		= select_task_rq_fair,
> -#endif /* CONFIG_SMP */
>  
>  	.check_preempt_curr	= check_preempt_wakeup,
>  
> @@ -1603,6 +1600,8 @@ static const struct sched_class fair_sched_class = {
>  	.put_prev_task		= put_prev_task_fair,
>  
>  #ifdef CONFIG_SMP
> +	.select_task_rq		= select_task_rq_fair,
> +
>  	.load_balance		= load_balance_fair,
>  	.move_one_task		= move_one_task_fair,
>  #endif
> diff --git a/kernel/sched_idletask.c b/kernel/sched_idletask.c
> index dec4cca..8a21a2e 100644
> --- a/kernel/sched_idletask.c
> +++ b/kernel/sched_idletask.c
> @@ -105,9 +105,6 @@ static const struct sched_class idle_sched_class = {
>  
>  	/* dequeue is not valid, we print a debug message there: */
>  	.dequeue_task		= dequeue_task_idle,
> -#ifdef CONFIG_SMP
> -	.select_task_rq		= select_task_rq_idle,
> -#endif /* CONFIG_SMP */
>  
>  	.check_preempt_curr	= check_preempt_curr_idle,
>  
> @@ -115,6 +112,8 @@ static const struct sched_class idle_sched_class = {
>  	.put_prev_task		= put_prev_task_idle,
>  
>  #ifdef CONFIG_SMP
> +	.select_task_rq		= select_task_rq_idle,
> +
>  	.load_balance		= load_balance_idle,
>  	.move_one_task		= move_one_task_idle,
>  #endif
> diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
> index cdf5740..c9aa5be 100644
> --- a/kernel/sched_rt.c
> +++ b/kernel/sched_rt.c
> @@ -1502,9 +1502,6 @@ static const struct sched_class rt_sched_class = {
>  	.enqueue_task		= enqueue_task_rt,
>  	.dequeue_task		= dequeue_task_rt,
>  	.yield_task		= yield_task_rt,
> -#ifdef CONFIG_SMP
> -	.select_task_rq		= select_task_rq_rt,
> -#endif /* CONFIG_SMP */
>  
>  	.check_preempt_curr	= check_preempt_curr_rt,
>  
> @@ -1512,6 +1509,8 @@ static const struct sched_class rt_sched_class = {
>  	.put_prev_task		= put_prev_task_rt,
>  
>  #ifdef CONFIG_SMP
> +	.select_task_rq		= select_task_rq_rt,
> +
>  	.load_balance		= load_balance_rt,
>  	.move_one_task		= move_one_task_rt,
>  	.set_cpus_allowed       = set_cpus_allowed_rt,
> --
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