Re: [PATCH 1/2] irqdomain: add empty irq_domain_check_msi_remap

[Mian Yousaf Kaukab]

On 03/02/2017 11:24 AM, Auger Eric wrote:
> Hi Mian Yousaf,
>
> On 02/03/2017 11:01, Mian Yousaf Kaukab wrote:
> > Fix following build error for s390:
> > drivers/vfio/vfio_iommu_type1.c: In function 'vfio_iommu_type1_attach_group':
> > drivers/vfio/vfio_iommu_type1.c:1290:25: error: implicit declaration of function 'irq_domain_check_msi_remap'
> >
> > Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@xxxxxxxx>
> > ---
> >   include/linux/irqdomain.h | 4 ++++
> >   1 file changed, 4 insertions(+)
> >
> > diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
> > index 188eced6813e..137817b08cdc 100644
> > --- a/include/linux/irqdomain.h
> > +++ b/include/linux/irqdomain.h
> > @@ -524,6 +524,10 @@ static inline struct irq_domain *irq_find_matching_fwnode(
> >   {
> >   	return NULL;
> >   }
> > +static inline bool irq_domain_check_msi_remap(void)
> > +{
> > +	return true;
> By default you should rather return false, reporting there is no MSI
> remapping capability on irq domain side. Besides thank you for the fix.
I choose to return true based on the function header comments of 
irq_domain_check_msi_remap. It says

"Return: false if any MSI irq domain does not support IRQ remapping, 
true otherwise (including if there is no MSI irq domain)"

So function should return true in case of no MSI irq domain. Have I miss 
understood this?

BR,
Yousaf