Re: [PATCH] thermal: Fix cdev registration with THERMAL_NO_LIMIT on 64bit

[Eduardo Valentin <edubezval@gmail.com>]

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On Wed, Dec 10, 2014 at 09:57:37AM +0800, Zhang Rui wrote:
> On Tue, 2014-12-09 at 12:22 +0000, Punit Agrawal wrote:
> > The size of unsigned long varies between 32 and 64 bit systems while
> > the size of phandle arguments is always 32 bits per parameter.
> > 
> > On 64-bit systems, cooling devices registered via of-thermal apis fail
> > to bind when the min/max cooling state is specified as
> > THERMAL_NO_LIMIT (-1UL) as there is a mis-match between the value read
> > from the device tree (32bit) and the pre-processor define (64bit).
> > 
> > As we're unlikely to need cooling states larger than 32 bits, and for
> > consistency with the size of phandle arguments, explicitly limit
> > THERMAL_NO_LIMIT to 32 bits.
> > 
> > Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
> > ---
> >  include/dt-bindings/thermal/thermal.h | 2 +-
> >  include/linux/thermal.h               | 2 +-
> >  2 files changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/include/dt-bindings/thermal/thermal.h b/include/dt-bindings/thermal/thermal.h
> > index 59822a9..b5e6b00 100644
> > --- a/include/dt-bindings/thermal/thermal.h
> > +++ b/include/dt-bindings/thermal/thermal.h
> > @@ -11,7 +11,7 @@
> >  #define _DT_BINDINGS_THERMAL_THERMAL_H
> >  
> >  /* On cooling devices upper and lower limits */
> > -#define THERMAL_NO_LIMIT		(-1UL)
> > +#define THERMAL_NO_LIMIT		(~0)
> >  
> I'm okay with the other change, so Eduardo, what do you think of this?

Adding to my fixes branch.


Prunit, thanks for spotting and fixing this issue.

> 
> thanks,
> rui
> >  #endif
> >  
> > diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> > index ef90838..005586f 100644
> > --- a/include/linux/thermal.h
> > +++ b/include/linux/thermal.h
> > @@ -38,7 +38,7 @@
> >  #define THERMAL_CSTATE_INVALID -1UL
> >  
> >  /* No upper/lower limit requirement */
> > -#define THERMAL_NO_LIMIT	THERMAL_CSTATE_INVALID
> > +#define THERMAL_NO_LIMIT	((u32)~0)
> >  
> >  /* Unit conversion macros */
> >  #define KELVIN_TO_CELSIUS(t)	(long)(((long)t-2732 >= 0) ?	\
> 
> 

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