linux-kernel - Re: IRQF_TIMER

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Date:	Mon, 12 Dec 2011 14:06:56 -0800
From:	Andres Salomon <dilinger@...ued.net>
To:	martin-eric.racine@....fi
Cc:	Jens Rottmann <JRottmann@...pertembedded.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-geode@...ts.infradead.org
Subject: Re: IRQF_TIMER | IRQF_SHARED ?

On Mon, 12 Dec 2011 23:00:01 +0200
Martin-Éric Racine <martin-eric.racine@....fi> wrote:

> 12. joulukuuta 2011 22.31 Andres Salomon <dilinger@...ued.net>
> kirjoitti:
> > On Mon, 12 Dec 2011 16:41:25 +0100
> > Jens Rottmann <JRottmann@...PERTEmbedded.de> wrote:
> >> one of our customers tripped over the fact that the MFGPT driver
> >> won't share its IRQ with anyone else. (MFGPT defaulted to same IRQ
> >> as audio, MFGPT driver loaded first, audio fails.) *No big deal!*
> >> They don't actually need MFGPT and will simply disable it. It just
> >> made me wonder ...
> >>
> >> Why would it be such a bad idea to use IRQF_TIMER | IRQF_SHARED
> >> (see patch below)? mfgpt_tick() already does properly return
> >> IRQ_NONE when it feels unresponsible. I tested it with either
> >> driver loaded first and it seemed to work (well, at least audio
> >> worked, don't know how to explicitly test cs5535-clockevt).
> >
> > Just loading cs5535-clockevt should start the periodic timer.  On my
> > XO-1, IRQ 7 starts firing immediately.
> 
> Could it be a good idea to inform udev maintainers of this?
> 

It *would* be nice to get it auto-loading..
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