Re: [PATCH 3/5] irq_work: Implement remote queueing

[Peter Zijlstra]

On Sun, May 25, 2014 at 04:29:49PM +0200, Frederic Weisbecker wrote:
> +bool irq_work_queue_on(struct irq_work *work, int cpu)
> +{
> +     /* Only queue if not already pending */
> +     if (!irq_work_claim(work))
> +             return false;
> +
> +     /* All work should have been flushed before going offline */
> +     WARN_ON_ONCE(cpu_is_offline(cpu));
        WARN_ON_ONCE(in_nmi());


Also, I would do both these checks before the claim thing.

> +
> +     if (llist_add(&work->llnode, &per_cpu(raised_list, cpu)))
> +             native_send_call_func_single_ipi(cpu);
> +
> +     return true;
> +}
> +EXPORT_SYMBOL_GPL(irq_work_queue_on);

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