Messages in this thread | | | Date | Tue, 27 May 2008 16:56:06 +0200 | From | Ingo Molnar <> | Subject | Re: Question about interrupt routing and irq allocation |
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* Jeremy Fitzhardinge <jeremy@goop.org> wrote:
>> So the most intelligent method would be to reserve the Linux irq >> itself but not the vector, i.e. allocate from irq_cfg[] in >> arch/x86/kernel/io_apic_64.c so that the irq number does not get >> reused - setting irq_cfg[irq].vector to -1 will achieve that. > > I'm initially targeting 32-bit, though obviously I'd like something > that works for both 32 and 64 bit. irq_cfg[] is missing in > io_apic_32.c; would I achieve the same effect by setting > irq_vector[irq] = 0xff or something?
ok, here comes the next phase of a rather cunning plan: please unify these vector allocators first! ;-)
it's nontrivial but would result in rather nice code. I dont know whether we want to extend per-CPU vectors to 32-bit as well ... but might be worth an attempt and we could give any exploratory patches a try in -tip. Eric, what do you think about the general approach?
this would also pave the way towards unified APIC code. Hm?
Ingo
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