Re: [PATCH v2] thermal: consistently use int for temperatures

Pavel Machek
2015-07-23T12:08:02Z

On Tue 2015-07-21 09:21:32, Sascha Hauer wrote:
> The thermal code uses int, long and unsigned long for temperatures
> in different places.
>
> Using an unsigned type limits the thermal framework to positive
> temperatures without need. Also several drivers currently will report
> temperatures near UINT_MAX for temperatures below 0°C. This will probably
> immediately shut the machine down due to overtemperature if started below
> 0°C.
>
> 'long' is 64bit on several architectures. This is not needed since INT_MAX °mC
> is above the melting point of all known materials.

Can we do something like

typedef millicelsius_t int;

...to document the units?

> Consistently use a plain 'int' for temperatures throughout the thermal code and
> the drivers. This only changes the places in the drivers where the temperature
> is passed around as pointer, when drivers internally use another type this is
> not changed.

Pavel

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