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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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