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

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Message-Id: <4CA05F220200007800018F81@vpn.id2.novell.com>
Date:	Mon, 27 Sep 2010 08:08:50 +0100
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	"Guenter Roeck" <guenter.roeck@...csson.com>
Cc:	<r.marek@...embler.cz>, <fenghua.yu@...el.com>,
	<khali@...ux-fr.org>, <lm-sensors@...sensors.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: x86/hwmon: conditionalize coretemp's dependency on PCI

>>> On 24.09.10 at 20:55, Guenter Roeck <guenter.roeck@...csson.com> wrote:
> On Mon, Sep 13, 2010 at 10:26:33AM -0000, Jan Beulich wrote:
>> PCI specific code is needed only when Atom CPUs are potentially
>> supported by the kernel.
>> 
>> Signed-off-by: Jan Beulich <jbeulich@...ell.com>
>> Cc: Rudolf Marek <r.marek@...embler.cz>
>> 
>> ---
>> drivers/hwmon/Kconfig |    3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>> 
>> 
>> 
>> 
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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>> 
>> --- linux-2.6.36-rc4/drivers/hwmon/Kconfig	2010-09-13 08:45:02.000000000 +0200
>> +++ 2.6.36-rc4-x86-coretemp-maybe-pci/drivers/hwmon/Kconfig	2010-09-10 
> 16:24:16.000000000 +0200
>> @@ -401,7 +401,8 @@ config SENSORS_GL520SM
>>  
>>  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.

Jan

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