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

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Date:	Fri, 27 Mar 2015 20:07:50 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Punit Agrawal <punit.agrawal@....com>
Cc:	linux-pm@...r.kernel.org, Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <edubezval@...il.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 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)

Sascha

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