Re: [RFC][PATCH 7/7] sched,dl: Convert switched_{from,to}_dl() / prio_changed_dl() to balance callbacks

[Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>]

* Peter Zijlstra <peterz@infradead.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 ‘switched_from_dl’:
kernel/sched/deadline.c:1713:2: error: implicit declaration of function ‘queue_pull_task’ [-Werror=implicit-function-declaration]
  queue_pull_task(rq);
  ^
cc1: some warnings being treated as errors

Thanks,
Kamalesh.