linux-kernel - Re: [RFC][PATCH 7/7] sched,dl: Convert switched_{from,to}_dl() / prio_changed

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Message-ID: <20150603045256.GB1545@linux.vnet.ibm.com>
Date:	Wed, 3 Jun 2015 10:22:57 +0530
From:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	umgwanakikbuti@...il.com, mingo@...e.hu, ktkhai@...allels.com,
	rostedt@...dmis.org, juri.lelli@...il.com, pang.xunlei@...aro.org,
	oleg@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 7/7] sched,dl: Convert switched_{from,to}_dl() /
 prio_changed_dl() to balance callbacks

* Peter Zijlstra <peterz@...radead.org> [2015-06-01 15:58:25]:

[...]

>  
> -static DEFINE_PER_CPU(struct callback_head, dl_balance_head);
> +static DEFINE_PER_CPU(struct callback_head, dl_push_head);
> +static DEFINE_PER_CPU(struct callback_head, dl_pull_head);
>  
>  static void push_dl_tasks(struct rq *);
> +static void pull_dl_task(struct rq *);
>  
>  static inline void queue_push_tasks(struct rq *rq)
>  {
>  	if (!has_pushable_dl_tasks(rq))
>  		return;
>  
> -	queue_balance_callback(rq, &per_cpu(dl_balance_head, rq->cpu), push_dl_tasks);
> +	queue_balance_callback(rq, &per_cpu(dl_push_head, rq->cpu), push_dl_tasks);
> +}
> +
> +static inline void queue_pull_task(struct rq *rq)
> +{
> +	queue_balance_callback(rq, &per_cpu(dl_pull_head, rq->cpu), pull_dl_task);
>  }

queue_pull_task() is not defined for CONFIG_SMP=n case, following build error
is seen while building the kernel with SMP=n:

  CC      kernel/sched/deadline.o
kernel/sched/deadline.c: In function âswitched_from_dlâ:
kernel/sched/deadline.c:1713:2: error: implicit declaration of function âqueue_pull_taskâ [-Werror=implicit-function-declaration]
  queue_pull_task(rq);
  ^
cc1: some warnings being treated as errors

Thanks,
Kamalesh.

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