Messages in this thread | | | Date | Sun, 20 Apr 2003 19:05:20 -0400 (EDT) | From | Zwane Mwaikambo <> | Subject | Re: [PATCH] 2.5.68 Fix IO_APIC IRQ assignment bug |
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On Sun, 20 Apr 2003, Linus Torvalds wrote:
> Good call. > > Although I suspect you need about a million interrupt sources to hit > this, since FIRST_SYSTEM_VECTOR is somethign like 0xef, and thus you can > hit it only when "offset" has already been incremented seven times > (which implies that we've walked the whole vector space quite a few > times by then). > > Did you actually see this on hardware?
Yes, we need to bail out in assign_irq_vector when we wrap around, otherwise we cause collisions when programming the IOAPIC. And we also need to avoid overruning NR_IRQS structures in setup_IO_APIC_irqs.
Zwane
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