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

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Message-Id: <1164053385.8073.24.camel@localhost.localdomain>
Date:	Tue, 21 Nov 2006 07:09:45 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Sergei Shtylyov <sshtylyov@...mvista.com>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, dwalker@...sta.com
Subject: Re: [PATCH] 2.6.18-rt7: PowerPC: fix breakage in threaded fasteoi
	type IRQ handlers

On Mon, 2006-11-20 at 17:56 +0100, Ingo Molnar wrote:
> * Sergei Shtylyov <sshtylyov@...mvista.com> 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.

What do you mean by a bit late ?

You can't mask before you know what interrupt occured so you don't
really have a choice there :-) I'm pretty sure that mask + eoi is what
Apple does on Darwin too though.

Cheers,
Ben.


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