Re: [Xen-devel] [PATCH v3 3/8] x86/irq: rename NR_HVM_IRQS and break it's dependency on VIOAPIC_NUM_PINS

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

On Fri, Mar 31, 2017 at 09:01:54AM -0600, Jan Beulich wrote:
> >>> On 29.03.17 at 16:47, <roger.pau@xxxxxxxxxx> wrote:
> > Rename it to NR_HVM_DOMU_IRQS, and get it's value from the size of the DomU 
> > vIO
> > APIC redirection table.
> 
> The line wrapping here is slightly puzzling...
> 
> > --- a/xen/include/xen/hvm/irq.h
> > +++ b/xen/include/xen/hvm/irq.h
> > @@ -76,13 +76,13 @@ struct hvm_girq_dpci_mapping {
> >  #define NR_ISAIRQS  16
> >  #define NR_LINK     4
> >  #if defined(CONFIG_X86)
> > -# define NR_HVM_IRQS VIOAPIC_NUM_PINS
> > +# define NR_HVM_DOMU_IRQS ARRAY_SIZE(((struct hvm_hw_vioapic 
> > *)0)->redirtbl)
> 
> An abuse of NULL pointers like this is not the end of the world, but
> did you consider avoiding this by expressing things starting from
> current (which ought to be always in scope)? Or did you event try
> doing so, and it didn't work out for some reason (possibly header
> dependencies getting in the way)?

It complains with:

error: incomplete definition of type 'struct vcpu'

on some places, I guess I could try to fix it, but I'm not sure if it's worth
it.

Roger.

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