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

[Sergei Shtylyov]

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
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