linux-kernel - Re: [RFC patch 0/5] genirq: add infrastructure for threaded interrupt handlers

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Date:	Thu, 2 Oct 2008 16:14:32 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Daniel Walker <dwalker@...sta.com>
cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Veen <arjan@...radead.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jon Masters <jonathan@...masters.org>,
	Sven Dietrich <sdietrich@...e.de>
Subject: Re: [RFC patch 0/5] genirq: add infrastructure for threaded interrupt
 handlers


On Thu, 2 Oct 2008, Daniel Walker wrote:

> On Thu, 2008-10-02 at 21:28 +0200, Ingo Molnar wrote:
> > * Daniel Walker <dwalker@...sta.com> wrote:
> > 
> > > > > Clearly threading irq handlers does have something to do with real 
> > > > > time, unless this patch isn't actually threading anything ..
> > 
> > Well, that's clearly wrong: threaded IRQ handlers are not tied to 
> > real-time in any way. Yes, they can be used for RT too but as far as the 
> > upstream kernel is involved that's at most an afterthought.
> 
> You contradict yourself .. I said "Clearly threading irq handlers does

No he did not.

> have something to do with real time" then you say "they can be used for 
> RT too" .. So my comments are clearly correct , they have "something" to
> do with real time. There exists a relationship of some kind or type.


What Ingo is telling you is:

  - RT needs threaded interrupts.

  - Threaded interrupts do not need RT

My dog is an Italian Greyhound.

Italian Greyhound is a dog, but
a dog is not an Italian Greyhound.

-- Steve

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