linux-kernel - Re: [v4 1/3] genirq: Introduce irq_set_vcpu_affinity() to target an interrupt to a VCPU

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Date:	Fri, 15 May 2015 15:18:00 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Feng Wu <feng.wu@...el.com>
cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	jiang.liu@...ux.intel.com
Subject: Re: [v4 1/3] genirq: Introduce irq_set_vcpu_affinity() to target an
 interrupt to a VCPU

On Thu, 30 Apr 2015, Feng Wu wrote:
> 
> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>

So I assume Jiang is the author, right?

> Signed-off-by: Feng Wu <feng.wu@...el.com>

>  /**
> + * irq_chip_set_vcpu_affinity_parent - Set vcpu affinity on the parent interrupt
> + * @data:	Pointer to interrupt specific data
> + * @dest:	The vcpu affinity information
> + */
> +int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, void *vcpu_info)
> +{
> +	data = data->parent_data;
> +	if (data->chip->irq_set_vcpu_affinity)
> +		return data->chip->irq_set_vcpu_affinity(data, vcpu_info);
> +
> +	return -ENOSYS;
> +}

That needs a prototype in irq.h, methinks

> +int irq_set_vcpu_affinity(unsigned int irq, void *vcpu_info)
> +{
> +	struct irq_desc *desc = irq_to_desc(irq);

  	irq_get_desc_lock() please

> +	struct irq_chip *chip;
> +	unsigned long flags;
> +	int ret = -ENOSYS;
> +
> +	if (!desc)
> +		return -EINVAL;
> +
> +	raw_spin_lock_irqsave(&desc->lock, flags);
> +	chip = desc->irq_data.chip;
> +	if (chip && chip->irq_set_vcpu_affinity)
> +		ret = chip->irq_set_vcpu_affinity(irq_desc_get_irq_data(desc),

Above you fiddle with desc->irq_data directly. Why using the accessor here?

> +						  vcpu_info);
> +	raw_spin_unlock_irqrestore(&desc->lock, flags);

Otherwise this looks good.

Thanks,

	tglx
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