[PATCH 01/13] thermal: Make temperatures consistently unsigned long

Sascha Hauer s.hauer at pengutronix.de
Fri Mar 27 12:07:50 PDT 2015

On Fri, Mar 27, 2015 at 10:18:14AM +0000, Punit Agrawal wrote:
> Hi Sascha,
> Sascha Hauer <s.hauer at pengutronix.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 at pengutronix.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)


Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

More information about the linux-arm-kernel mailing list