Messages in this thread | | | Subject | Re: [PATCH 4/5] Centralise NO_IRQ definition | From | Benjamin Herrenschmidt <> | Date | Tue, 22 Nov 2005 09:20:44 +1100 |
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> If we make PCI_NO_IRQ be -1, then PC's need to remap 0 to that value. In > pretty much _exactly_ the same places that I suggest that the ppc code > should do it.
No. Remapping a valid number to something else means remapping at runtime for all things that manipulate an irq : issuing it, enable/disable callbacks, etc...
"Fixing" the definition of "no irq" on x86 means only changing the boot code that sets up irq numbers, whatever it is.
Thus what solution is technically superior can be argued based on the fact that your solution introduce overhead to code path that are hot during normal kernel operations.
Ben.
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