Messages in this thread | | | Date | Sat, 4 Jan 2003 09:41:55 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: [RFC] irq handling code consolidation, second try (ppc part) |
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On 4 Jan 2003, Benjamin Herrenschmidt wrote: > > The "easy" way here to implement that is to make the irq_desc array larger than > NR_IRQs (or rather split NR_IRQs into NR_SYS_IRQS + NR_DYNAMIC_IRQS). The > additional "slots" could then easily be allocated/freed. Thus, keeping my > cardbus example, the cardbus driver can allocate a couple of slots (that is IRQ > numbers) dynamically, and use it's own startup/shutdown/enable/disable/... > hooks for them, dealing itself with the cascade from the PCI irq.
Linearizing a space like this is always a bad idea, I think.
It would be entirely possible to just add the irq routing information to the "struct device" tree, and have a "dev_request_irq(dev, ...)", along with a few helper functions like "pci_request_irq(pci_dev, ...)".
And the old "request_irq()" would just use the system root device as the device.
Linus
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