linux-kernel - Re: [PATCH v2 1/8] thermal: Provide stub for thermal_of_cooling_device

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Message-ID: <20150114183211.GB3672@developer>
Date:	Wed, 14 Jan 2015 14:32:13 -0400
From:	Eduardo Valentin <edubezval@...il.com>
To:	Lukasz Majewski <l.majewski@...sung.com>
Cc:	Kamil Debski <k.debski@...sung.com>,
	Jean Delvare <jdelvare@...e.de>,
	Guenter Roeck <linux@...ck-us.net>, lm-sensors@...sensors.org,
	Linux PM list <linux-pm@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>, devicetree@...r.kernel.org,
	Lukasz Majewski <l.majewski@...ess.pl>,
	Kukjin Kim <kgene.kim@...sung.com>,
	linux-kernel@...r.kernel.org,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Abhilash Kesavan <kesavan.abhilash@...il.com>,
	Abhilash Kesavan <a.kesavan@...sung.com>
Subject: Re: [PATCH v2 1/8] thermal: Provide stub for
 thermal_of_cooling_device_register() function

On Wed, Jan 14, 2015 at 04:01:06PM +0100, Lukasz Majewski wrote:
> Hi Eduardo,
> 
> > On Fri, Jan 02, 2015 at 02:54:28PM -0400, Eduardo Valentin wrote:
> > > On Mon, Dec 22, 2014 at 05:27:41PM +0100, Lukasz Majewski wrote:
> > > > Odroid U3 fan can work without being registered as OF cooling
> > > > device (with CONFIG_THERMAL_OF disabled).
> > > > In this situation it can be controlled via PWM entry at
> > > > /sys/class/hwmon/hwmon0/pwm1.
> > > > 
> > > > Therefore, the thermal_of_cooling_device_register() function
> > > > needs a stub to allow clean compilation.
> > > > 
> > > > Signed-off-by: Lukasz Majewski <l.majewski@...sung.com>
> > > 
> > > Acked-by: Eduardo Valentin <edubezval@...il.com>
> > 
> > Sorry, too fast,
> > 
> > This is actually
> > Nacked-by: Eduardo Valentin <edubezval@...il.com>
> > 
> > :-)
> > 
> > I get this error:
> > drivers/thermal/thermal_core.c:1210:1: error: redefinition of
> > ‘thermal_of_cooling_device_register’
> >  thermal_of_cooling_device_register(struct device_node *np,
> >   ^
> >   In file included from drivers/thermal/thermal_core.c:34:0:
> >   include/linux/thermal.h:321:1: note: previous definition of
> >   ‘thermal_of_cooling_device_register’ was here
> >    thermal_of_cooling_device_register(struct device_node *np,
> >     ^
> > 
> > 
> > We provide the function in thermal core even if CONFIG_THERMAL_OF is
> > not set.
> 
> Unfortunately the PWM fan subsystem can work perfectly fine without
> CONFIG_THERMAL.
> 

Now I understand what you are trying to do.

> I think that it would be enough to make something like this in
> the ./include/linux/thermal.h:
> 
> #ifdef CONFIG_THERMAL
Well, I think it should be the opposite here:

#ifndef CONFIG_THERMAL

that is, if no config thermal, then you provide the stub not the other
way around.

> 	static inline struct thermal_cooling_device *
> 		thermal_of_cooling_device_register(struct device_node
> 		*np, char *type, void *devdata,
> 				   const struct
> 		thermal_cooling_device_ops *ops) {
> 		return NULL;
> 	}
> #else
> 	[ already present declaration of
> 	thermal_of_cooling_device_register() ]
> #endif /* CONFIG_THERMAL */


> 
> 
> 
> > > 
> > > > ---
> > > > Changes for v2:
> > > > - None
> > > > ---
> > > >  include/linux/thermal.h | 14 +++++++++++---
> > > >  1 file changed, 11 insertions(+), 3 deletions(-)
> > > > 
> > > > diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> > > > index 2de3d9e..871123c 100644
> > > > --- a/include/linux/thermal.h
> > > > +++ b/include/linux/thermal.h
> > > > @@ -328,6 +328,10 @@ thermal_zone_of_sensor_register(struct
> > > > device *dev, int id, void *data, const struct
> > > > thermal_zone_of_device_ops *ops); void
> > > > thermal_zone_of_sensor_unregister(struct device *dev, struct
> > > > thermal_zone_device *tz); +struct thermal_cooling_device *
> > > > +thermal_of_cooling_device_register(struct device_node *np,
> > > > +				   char *type, void *devdata,
> > > > +				   const struct
> > > > thermal_cooling_device_ops *); #else
> > > >  static inline struct thermal_zone_device *
> > > >  thermal_zone_of_sensor_register(struct device *dev, int id, void
> > > > *data, @@ -342,6 +346,13 @@ void
> > > > thermal_zone_of_sensor_unregister(struct device *dev, {
> > > >  }
> > > >  
> > > > +static inline struct thermal_cooling_device *
> > > > +thermal_of_cooling_device_register(struct device_node *np,
> > > > +				   char *type, void *devdata,
> > > > +				   const struct
> > > > thermal_cooling_device_ops *ops) +{
> > > > +	return NULL;
> > > > +}
> > > >  #endif
> > > >  struct thermal_zone_device *thermal_zone_device_register(const
> > > > char *, int, int, void *, struct thermal_zone_device_ops *,
> > > > @@ -357,9 +368,6 @@ void thermal_zone_device_update(struct
> > > > thermal_zone_device *); 
> > > >  struct thermal_cooling_device
> > > > *thermal_cooling_device_register(char *, void *, const struct
> > > > thermal_cooling_device_ops *); -struct thermal_cooling_device *
> > > > -thermal_of_cooling_device_register(struct device_node *np, char
> > > > *, void *,
> > > > -				   const struct
> > > > thermal_cooling_device_ops *); void
> > > > thermal_cooling_device_unregister(struct thermal_cooling_device
> > > > *); struct thermal_zone_device
> > > > *thermal_zone_get_zone_by_name(const char *name); int
> > > > thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned
> > > > long *temp); -- 2.0.0.rc2
> > > > 
> > 
> > 
> 
> 
> 
> -- 
> Best regards,
> 
> Lukasz Majewski
> 
> Samsung R&D Institute Poland (SRPOL) | Linux Platform Group

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