linux-kernel - Re: Section Mismatches

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Message-ID: <20100809060831.GF2841@nokia.com>
Date:	Mon, 9 Aug 2010 09:08:31 +0300
From:	Felipe Balbi <felipe.balbi@...ia.com>
To:	ext Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	"Balbi Felipe (Nokia-MS/Helsinki)" <felipe.balbi@...ia.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Section Mismatches

On Wed, Aug 04, 2010 at 02:26:59PM +0200, ext Uwe Kleine-König wrote:
>Hi Felipe,
>
>On Wed, Aug 04, 2010 at 02:11:56PM +0300, Felipe Balbi wrote:
>> I see that your commit 0db252452378aa7a9e001a13226e1cd1dc61453d removed
>> the *_driver from the symbol whitelist when referencing init section
>> (heh, it took a while), but could you explain what's the rationale
>> behind that ?
>The rational is that it's AFAIK wrong if a driver references a function
>that lives in .init.text.

how about all the driver structures ? should they remove __init from 
probe() or stop saving the probe() function's pointer ?

That can be done for e.g. platform drivers, but for cpufreq_driver 
structures, I can't see a way to avoid a section mismatch (not without 
changing the cpufreq code a bit, at least). And, to me, that init has to 
live in the .init.text section as it's pretty much only called to 
initialize the frequency table for the cpu.

>Do you think that's wrong?

no, no. Not saying that. Just wondering what will happen with several 
drivers, will they change from _driver to _ops or try to stop saving 
probe() pointers into the driver structure.

-- 
balbi

DefectiveByDesign.org
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