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SubjectRe: [PATCH 2/2] uio: add an of_genirq driver
Hans J. Koch wrote:
> On Sun, Jun 14, 2009 at 09:05:33PM +0200, Wolfram Sang wrote:
>>> Anyway, 0 is a valid IRQ number, so it cannot be used as "no irq".
>> May I point you to this thread?
> Linus is just plain wrong in this 4 year old mail.

See also this related thread.

>> (The issue comes up once in a while as some archs still use NO_IRQ, some with
>> 0 some with -1)
>>>> if (uioinfo->irq == NO_IRQ)
>>>> uioinfo->irq = UIO_IRQ_NONE;
>>> Sorry for my ignorance, but what is NO_IRQ? If I do

It's 0 on PowerPC but ARM seems still to use -1.

For x86 it's not defined at all. But as this code is for the PowerPC,
where using NO_IRQ seems still to be OK.


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