linux-kernel - Re: [patch 01/10] e1000e: make E1000E default to the same kconfig setting as E1000

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Date:	Fri, 14 Dec 2007 15:54:14 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Jeff Garzik <jeff@...zik.org>, netdev@...r.kernel.org,
	randy.dunlap@...cle.com, auke-jan.h.kok@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 01/10] e1000e: make E1000E default to the same kconfig
 setting as E1000

Andrew Morton wrote:
> On Fri, 14 Dec 2007 15:39:26 -0500
> Jeff Garzik <jeff@...zik.org> wrote:
>
>   
>> akpm@...ux-foundation.org wrote:
>>     
>>> From: Randy Dunlap <randy.dunlap@...cle.com>
>>>
>>> Make E1000E default to the same kconfig setting as E1000.  So people's
>>> machiens don't stop working when they use oldconfig.
>>>
>>> Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
>>> Cc: Jeff Garzik <jeff@...zik.org>
>>> Cc: Auke Kok <auke-jan.h.kok@...el.com>
>>> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
>>> ---
>>>
>>>  drivers/net/Kconfig |    1 +
>>>  1 file changed, 1 insertion(+)
>>>
>>> diff -puN drivers/net/Kconfig~e1000e-make-e1000e-default-to-the-same-kconfig-setting-as-e1000 drivers/net/Kconfig
>>> --- a/drivers/net/Kconfig~e1000e-make-e1000e-default-to-the-same-kconfig-setting-as-e1000
>>> +++ a/drivers/net/Kconfig
>>> @@ -1986,6 +1986,7 @@ config E1000_DISABLE_PACKET_SPLIT
>>>  config E1000E
>>>  	tristate "Intel(R) PRO/1000 PCI-Express Gigabit Ethernet support"
>>>  	depends on PCI
>>> +	default E1000
>>>       
>> I am not inclined to apply this one.  This practice, applied over time, 
>> will tend to accumulate weird 'default' and 'select' statements.
>>
>> So I think the breakage that occurs is mitigated by two factors:
>> 1) kernel hackers that do their own configs are expected to be able to 
>> figure this stuff.
>> 2) kernel builders (read: distros, mainly) are expected to have put 
>> thought into the Kconfig selection and driver migration strategies.
>>
>> PCI IDs move across drivers from time, and we don't want to apply these 
>> sorts changes:  Viewed in the long term, the suggested patch is merely a 
>> temporary change to allow kernel experts to more easily deal with the 
>> PCI ID migration across drivers.
>>
>> I would prefer simply to communicate to kernel experts and builders 
>> about a Kconfig issue that could potentially their booting/networking... 
>>   because this patch is only needed if the kernel experts do not already 
>> know about a necessary config update.
>>     
>
> You can take it out again later on - most people's .configs will then have
> E1000E set.   People who still do `cp ancientconfig .config ; make oldconfig'
> remain screwed.
>   

Sounds like something build system should help with. Some more user 
friendly syntax for dealing
with issues of driver conversion.
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