linux-kernel - Re: x86/hwmon: conditionalize coretemp's dependency on PCI

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Message-ID: <20100927121650.GB31847@ericsson.com>
Date:	Mon, 27 Sep 2010 05:16:50 -0700
From:	Guenter Roeck <guenter.roeck@...csson.com>
To:	Jan Beulich <JBeulich@...ell.com>
CC:	"r.marek@...embler.cz" <r.marek@...embler.cz>,
	"fenghua.yu@...el.com" <fenghua.yu@...el.com>,
	"khali@...ux-fr.org" <khali@...ux-fr.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: x86/hwmon: conditionalize coretemp's dependency on PCI

On Mon, Sep 27, 2010 at 03:08:50AM -0400, Jan Beulich wrote:
[...]

> >>  
> >>  config SENSORS_CORETEMP
> >>  	tristate "Intel Core/Core2/Atom temperature sensor"
> >> -	depends on X86 && PCI && EXPERIMENTAL
> >> +	depends on X86 && EXPERIMENTAL
> >> +	depends on PCI || (!MATOM && !GENERIC_CPU && !X86_GENERIC)
> >>  	help
> >>  	  If you say yes here you get support for the temperature
> >>  	  sensor inside your CPU. Most of the family 6 CPUs
> > 
> > Resending my reply to this one as well. Again, apologies if there is 
> > duplication.
> > 
> > The coretemp code unconditionally calls pci functions, even if PCI is not 
> > defined.
> > I am concerned that this might cause problems. It might be better to stick 
> > with
> > the more generic dependency instead of trying to optimize too much.
> 
> pci.h takes care to define stub inline functions for the !CONFIG_PCI
> case. It seemed largely odd for a driver like this to depend on PCI
> at all, and hence I think it is more transparent to make the needs
> explicit.
> 
Seems to me the dependency should not exist in the first place, then.
Otherwise, the driver would still be disabled for GENERIC_CPU, which isn't
good either.

Are there examples of other drivers which are not defining the PCI dependency
but are conditionally calling pci functions ?

Guenter
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