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

Sascha Hauer
2015-07-21T07:31:11Z

Hi Punit,

On Fri, Jul 17, 2015 at 12:14:36PM +0100, Punit Agrawal wrote:
> Hi Sascha,
>
> Sascha Hauer <s.hauer@pengutronix.de> writes:
>
> > 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.
> >
> > 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.
> >
> > Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
>
> Thanks for moving over the thermal sub-system in Linux to consistently
> use a single type.
>
> In your patch, you missed migrating over power_allocator governor and
> it's associated trace events. It got merged for v4.2.
>
> Could you incorporate something like below in your next version?

It seems I have changed drivers/thermal/power_allocator.c but missed
include/trace/events/thermal_power_allocator.h. Please check out the v2
patch I just sent.

Sascha

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