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SubjectRe: [stable] [PATCH] x86: Reserve FIRST_DEVICE_VECTOR in used_vectors bitmap
> > And more importantly dev->irq == 0 or IRQ == 0 to anything but arch
> > internal code means "no interrupt line".
>
> I thought we had changed that a while ago, as some arches had 0 as a
> valid irq line.

No .. Linus decreed (and I think sensibly myself that IRQ = 0 meant no
IRQ assigned).. the argument being that in C you naturally write stuff
like

if (!dev->irq)
I can dig up the reference URLS to the list mails if you want


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