netdev - Re: [PATCH v2] usbnet: enable more aggressive autosuspend

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Date:	Wed, 12 Nov 2008 10:01:13 +0100
From:	Per Hallsmark <per.hallsmark@...ata.se>
To:	David Miller <davem@...emloft.net>
CC:	oliver@...kum.org, jeff@...zik.org, linux-usb@...r.kernel.org,
	netdev@...r.kernel.org, david-b@...bell.net
Subject: Re: [PATCH v2] usbnet: enable more aggressive autosuspend

David Miller wrote:
> From: Oliver Neukum <oliver@...kum.org>
> Date: Fri, 7 Nov 2008 13:24:17 +0100
>
>   
>> Am Freitag, 7. November 2008 13:00:05 schrieb Jeff Garzik:
>>     
>>> Oliver Neukum wrote:
>>>       
>>>> Am Freitag, 7. November 2008 09:26:33 schrieb Jeff Garzik:
>>>>         
>>>>> I pondered taking the easy route of fixing this by surrounding the 
>>>>> auto_pm reference with an ifdef, but it seems like usbnet could use a 
>>>>> bit more thought -- it is questionable whether usbnet_suspend/resume 
>>>>> should be built at all, if !CONFIG_PM, even though they are exported.
>>>>>           
>>>> As this is a generic problem, shouldn't we get the compiler to do
>>>> this for us?
>>>>         
>>> Can you be more specific?
>>>       
>> As these methods are static the compiler is able to tell whether they
>> are referenced by anything but the tables. We should be able to set
>> an attribute in the header file that tells the compiler that these methods
>> won't be called and can be omitted in the build. Otherwise we have to ifdef
>> all those methods.
>>     
>
> The problem is that the content of these functions still needs to be
> parsed, so references to ifdef'd out structure members are still going
> to throw errors.
>
> For the time being please add the necessary CONFIG_PM wrappers around
> the suspend and resume methods, as this is what we do tree wide and
> I don't think you want these usbnet changes blocked by some fancy
> compiler facility that hasn't been implemented yet.
>   
Ok, this news I've missed. Should I regenerate the patch or is it 
handled anyway?

Best regards,
Per

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