linux-kernel - Re: [PATCH v5 3/7] gpio: davinci: use irqdomain

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Date:	Mon, 18 Nov 2013 13:56:39 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Prabhakar Lad <prabhakar.csengg@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Pawel Moll <pawel.moll@....com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Sekhar Nori <nsekhar@...com>,
	LKML <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Rob Landley <rob@...dley.net>,
	Grant Likely <grant.likely@...aro.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	LAK <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 3/7] gpio: davinci: use irqdomain

On Mon, Nov 18, 2013 at 02:11:32PM +0100, Linus Walleij wrote:
> On Fri, Nov 8, 2013 at 11:11 AM, Prabhakar Lad
> <prabhakar.csengg@...il.com> wrote:
> 
> > From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
> >
> > This patch converts the davinci gpio driver to use irqdomain
> > support.
> >
> > Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
> 
> (...)
> > @@ -282,8 +283,7 @@ gpio_irq_handler(unsigned irq, struct irq_desc *desc)
> >         desc->irq_data.chip->irq_ack(&desc->irq_data);
> >         while (1) {
> >                 u32             status;
> > -               int             n;
> > -               int             res;
> > +               int             bit;
> 
> Why is this an int? I think u8 would suffice.

For local variables, it's better to use "int" or even "unsigned" here
rather than u8.  u8 tells the compiler that you want the variable to be
8-bit, which seems fine, except the compiler is then at liberty to keep
on masking the register back down to 8-bit.
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