linux-kernel - Re: [PATCH] genirq: Move irq_set_vcpu_affinity out of "#ifdef CONFIG

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Date:	Sat, 3 Oct 2015 17:10:34 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Feng Wu <feng.wu@...el.com>, tglx@...utronix.de,
	pbonzini@...hat.com
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] genirq: Move irq_set_vcpu_affinity out of "#ifdef
 CONFIG_SMP"

On 2015/10/3 16:20, Feng Wu wrote:
> irq_set_vcpu_affinity() is needed when CONFIG_SMP=n, so move the
> definition out of "#ifdef CONFIG_SMP"
> 
> Suggested-by: Paolo Bonzini <pbonzini@...hat.com>
> Signed-off-by: Feng Wu <feng.wu@...el.com>

Reviewed-by: Jiang Liu <jiang.liu@...ux.intel.com>

> ---
>  kernel/irq/manage.c | 62 ++++++++++++++++++++++++++---------------------------
>  1 file changed, 31 insertions(+), 31 deletions(-)
> 
> diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
> index 1c58655..90b378d 100644
> --- a/kernel/irq/manage.c
> +++ b/kernel/irq/manage.c
> @@ -258,37 +258,6 @@ int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m)
>  }
>  EXPORT_SYMBOL_GPL(irq_set_affinity_hint);
>  
> -/**
> - *	irq_set_vcpu_affinity - Set vcpu affinity for the interrupt
> - *	@irq: interrupt number to set affinity
> - *	@vcpu_info: vCPU specific data
> - *
> - *	This function uses the vCPU specific data to set the vCPU
> - *	affinity for an irq. The vCPU specific data is passed from
> - *	outside, such as KVM. One example code path is as below:
> - *	KVM -> IOMMU -> irq_set_vcpu_affinity().
> - */
> -int irq_set_vcpu_affinity(unsigned int irq, void *vcpu_info)
> -{
> -	unsigned long flags;
> -	struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
> -	struct irq_data *data;
> -	struct irq_chip *chip;
> -	int ret = -ENOSYS;
> -
> -	if (!desc)
> -		return -EINVAL;
> -
> -	data = irq_desc_get_irq_data(desc);
> -	chip = irq_data_get_irq_chip(data);
> -	if (chip && chip->irq_set_vcpu_affinity)
> -		ret = chip->irq_set_vcpu_affinity(data, vcpu_info);
> -	irq_put_desc_unlock(desc, flags);
> -
> -	return ret;
> -}
> -EXPORT_SYMBOL_GPL(irq_set_vcpu_affinity);
> -
>  static void irq_affinity_notify(struct work_struct *work)
>  {
>  	struct irq_affinity_notify *notify =
> @@ -424,6 +393,37 @@ setup_affinity(struct irq_desc *desc, struct cpumask *mask)
>  }
>  #endif
>  
> +/**
> + *	irq_set_vcpu_affinity - Set vcpu affinity for the interrupt
> + *	@irq: interrupt number to set affinity
> + *	@vcpu_info: vCPU specific data
> + *
> + *	This function uses the vCPU specific data to set the vCPU
> + *	affinity for an irq. The vCPU specific data is passed from
> + *	outside, such as KVM. One example code path is as below:
> + *	KVM -> IOMMU -> irq_set_vcpu_affinity().
> + */
> +int irq_set_vcpu_affinity(unsigned int irq, void *vcpu_info)
> +{
> +	unsigned long flags;
> +	struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
> +	struct irq_data *data;
> +	struct irq_chip *chip;
> +	int ret = -ENOSYS;
> +
> +	if (!desc)
> +		return -EINVAL;
> +
> +	data = irq_desc_get_irq_data(desc);
> +	chip = irq_data_get_irq_chip(data);
> +	if (chip && chip->irq_set_vcpu_affinity)
> +		ret = chip->irq_set_vcpu_affinity(data, vcpu_info);
> +	irq_put_desc_unlock(desc, flags);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(irq_set_vcpu_affinity);
> +
>  void __disable_irq(struct irq_desc *desc)
>  {
>  	if (!desc->depth++)
> 
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