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

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Date:	Fri, 24 Sep 2010 11:55:09 -0700
From:	Guenter Roeck <guenter.roeck@...csson.com>
To:	Jan Beulich <jbeulich@...ell.com>
CC:	fenghua.yu@...el.com, khali@...ux-fr.org, r.marek@...embler.cz,
	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org
Subject: Re: x86/hwmon: conditionalize coretemp's dependency on PCI

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(-)
> 
> 
> 
> 
> --
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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.

Guenter
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