linux-kernel - Re: [PATCH 2/2] uio: add an of

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Date:	Sun, 14 Jun 2009 21:23:59 +0200
From:	"Hans J. Koch" <hjk@...utronix.de>
To:	Wolfram Sang <w.sang@...gutronix.de>
Cc:	"Hans J. Koch" <hjk@...utronix.de>, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, devicetree-discuss@...abs.org,
	Magnus Damm <magnus.damm@...il.com>, Greg KH <gregkh@...e.de>
Subject: Re: [PATCH 2/2] uio: add an of_genirq driver

On Sun, Jun 14, 2009 at 09:05:33PM +0200, Wolfram Sang wrote:
> 
> > Anyway, 0 is a valid IRQ number, so it cannot be used as "no irq".
> 
> May I point you to this thread?
> 
> http://lkml.org/lkml/2005/11/21/221

Linus is just plain wrong in this 4 year old mail.

> 
> (The issue comes up once in a while as some archs still use NO_IRQ, some with
> 0 some with -1)
> 
> > > 	if (uioinfo->irq == NO_IRQ)
> > > 		uioinfo->irq = UIO_IRQ_NONE;
> > 
> > Sorry for my ignorance, but what is NO_IRQ? If I do a
> > 
> > grep -r NO_IRQ include/
> > 
> > I get nothing.
> 
> Try a 'cd arch' before that :)

no such luck in arch/x86/ ...

> 
> > Well, you claim it's a false positive. So far, you did not get any responses,
> > AFAICS. I tend to agree with you, but I'd like to avoid patches that don't
> > pass checkpatch.pl, whatever the reason. Either the false positive gets
> > confirmed and fixed, or you should fix your patch.
> 
> Well, I assume that issues regarding checkpatch do not have the highest
> priority (especially while the merge-window is open), which is understandable.
> Fixing this bug (I take any bets that this is one ;)) might not be so trivial,
> as modifying $Attributes can easily have lots of side-effects.
> 
> Now, all this does not matter much, as the objections Grant raised are valid
> and there might be a totally different outcome to bind devices to UIO. But at
> least, we have some code to discuss...

OK, I'm looking forward to your next version.

Thanks,
Hans


> 
> Regards,
> 
>    Wolfram
> 
> -- 
> Pengutronix e.K.                           | Wolfram Sang                |
> Industrial Linux Solutions                 | http://www.pengutronix.de/  |


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