Re: [PATCH 00/33] dyn_array and nr_irqs support v4

[Alan Cox]

> #ifndef CONFIG_HAVE_SPARSE_IRQ
> #define   valid_irq(irq)          ((irq) > 0 && (irq) < nr_irqs)
> #else
> #define   valid_irq(irq)          ((irq) > 0)

For a sparse IRQ you might want to call an arch specific bit of C to do
the validating. Not sure that matters too much though as must user set
interrupts are ISA 8)

> anyway why 0 is invalid instead of -1U...?

So you can write the natural thing in C 

	if (!dev->irq)
		poll_device();

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