linux-kernel - Re: [PATCH 01/13] thermal: Make temperatures consistently unsigned long

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Message-ID: <20150407014707.GB4648@localhost.localdomain>
Date:	Mon, 6 Apr 2015 18:47:08 -0700
From:	Eduardo Valentin <edubezval@...il.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	Punit Agrawal <punit.agrawal@....com>, linux-pm@...r.kernel.org,
	Zhang Rui <rui.zhang@...el.com>, linux-kernel@...r.kernel.org,
	Stephen Warren <swarren@...dotorg.org>,
	Mikko Perttunen <mikko.perttunen@...si.fi>,
	kernel@...gutronix.de, linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 01/13] thermal: Make temperatures consistently unsigned
 long

On Fri, Mar 27, 2015 at 08:07:50PM +0100, Sascha Hauer wrote:
> On Fri, Mar 27, 2015 at 10:18:14AM +0000, Punit Agrawal wrote:
> > Hi Sascha,
> > 
> > Sascha Hauer <s.hauer@...gutronix.de> writes:
> > 
> > > The thermal framework uses int, long and unsigned long for temperatures
> > > in millicelsius. The majority of functions uses unsigned long, so change
> > > the remaining functions to use this type aswell.
> > >
> > > Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> > 
> > I'd suggest changing to long instead. It would allow the use of the
> > thermal framework in environments where temperatures are below 0C -
> > quite easily reached in many parts of the world.
> 
> I agree to use a signed type. I also found it not so nice that the thermal
> core does not support negative temperatures. I only chose unsigned long
> because the patch got smallest that way, but I already expected this
> answer ;)
> We could also use int instead of long. INT_MAX °mC is still enough for using
> a computer on the surface of the sun (Not for the center though)

Agreed, int is the preferred type.


> 
> Sascha
> 
> -- 
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