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

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Date:	Sun, 19 Nov 2006 21:23:48 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
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


* Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:

> > dont worry, it's -rt only stuff.
> 
> Still, I'm curious :-) Besides, there have been people talking about 
> having -rt work on ppc64 so ...

ok :)

> What do you need an ack() for on fasteoi ? On all fasteoi controllers 
> I have, ack is implicit by obtaining the vector number and all there 
> is is an eoi...

it's a compatibility hack only. Threaded handlers are a different type 
of flow, but often the fasteoi handler is not changed to the threaded 
handler so i changed it to be a threaded handler too.

threaded handlers need a mask() + an ack(), because that's the correct 
model to map them to kernel threads - threaded handlers can be delayed 
for a long time if something higher-prio is preempting them.

	Ingo
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