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

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Date:	Mon, 18 May 2015 02:42:19 +0000
From:	"Wu, Feng" <feng.wu@...el.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jiang.liu@...ux.intel.com" <jiang.liu@...ux.intel.com>,
	"Wu, Feng" <feng.wu@...el.com>
Subject: RE: [v4 1/3] genirq: Introduce irq_set_vcpu_affinity() to target an
 interrupt to a VCPU

Thanks for the review!

> -----Original Message-----
> From: Thomas Gleixner [mailto:tglx@...utronix.de]
> Sent: Friday, May 15, 2015 9:18 PM
> To: Wu, Feng
> 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?

Oh, yes, I think I made some mistakes while applying the patches. Thanks
for pointing this out!

> 
> > 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?

I will only use one style here.

Thanks,
Feng

> 
> > +						  vcpu_info);
> > +	raw_spin_unlock_irqrestore(&desc->lock, flags);
> 
> Otherwise this looks good.
> 
> Thanks,
> 
> 	tglx
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