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

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Date:	Thu, 8 Oct 2015 04:43:51 +0000
From:	"Wu, Feng" <feng.wu@...el.com>
To:	"tglx@...utronix.de" <tglx@...utronix.de>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>
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>,
	"Wu, Feng" <feng.wu@...el.com>
Subject: RE: [PATCH] genirq: Move irq_set_vcpu_affinity out of "#ifdef
 CONFIG_SMP"

Hi Thomas & Paolo,

> -----Original Message-----
> From: Jiang Liu [mailto:jiang.liu@...ux.intel.com]
> Sent: Saturday, October 03, 2015 5:11 PM
> To: Wu, Feng; 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"

What is your option about this patch, Thanks a lot!

Thanks,
Feng

> >
> > 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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