linux-kernel - Re: [PATCH 0/7] Boot IRQ quirks and rerouting

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Message-ID: <Pine.LNX.4.55.0806050005400.28685@cliff.in.clinika.pl>
Date:	Thu, 5 Jun 2008 00:08:26 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Jon Masters <jcm@...hat.com>
cc:	Stefan Assmann <sassmann@...e.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Olaf Dabrunz <od@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] Boot IRQ quirks and rerouting

On Wed, 4 Jun 2008, Jon Masters wrote:

> *). Top level handler is *tiny*. It's job is to get called (along with
> every other such function registered for a particular IRQ line) and
> determine if its device generated the interrupt, and to acknowledge,
> preventing the device from asserting the IRQ line any longer.
> 
> The top part is called in hard IRQ context, even on RT.
> 
> *). Bottom level is automatically scheduled by the kernel in response to
> the top part acknowledging that its device caused the interrupt.
> 
> The bottom part is run inside a dedicated kernel thread.

 I see what you mean -- well, with sane hardware that should be doable 
with little effort indeed.

  Maciej
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