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

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Date:	Fri, 9 Oct 2015 13:18:50 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	"Wu, Feng" <feng.wu@...el.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>
Cc:	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>
Subject: Re: [PATCH] genirq: Move irq_set_vcpu_affinity out of "#ifdef
 CONFIG_SMP"



On 08/10/2015 06:43, Wu, Feng wrote:
> Hi Thomas & Paolo,
> 
> What is your option about this patch, Thanks a lot!
> 
> Thanks,
> Feng
> 
>>> 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++)
>>>

Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>

Paolo
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