* Sergei Shtylyov <[email protected]> wrote: > Hello. > > Ingo Molnar wrote: > > >>>on PPC64, 'get the vector' initiates an ACK as well - is that done > >>>before handle_irq() is done? > > >> Exactly. How else do_IRQ() would know the vector? > > >the reason i'm asking is that in this case masking is a bit late at this > >point and there's a chance for a repeat interrupt. > > How's that? Acknowledge != EOI on OpenPIC (as well as 8259). > Acknoledging sets the bit in the in-service register preventing all > the interrupts with same or lower prioriry from being accepted. ah, ok. The x86 APIC does that automatically, and only an EOI has to be passed. So i guess we are in wild agreement ;) i'm hacking up something now to see whether it makes sense to introduce a central threaded flow type, or whether it's better the branch off the current flow types (as the code does it right now). Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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