Re: [PATCH] 2.6.18-rt7: PowerPC: fix breakage in threaded fasteoi type IRQ handlers

Sergei Shtylyov
2006-11-20T17:01:55Z

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.

> Ingo

WBR, Sergei