netdev - Re: modpost warning question

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Message-Id: <1409C32B-61A8-49D1-BF64-1CFAA5F8B93B@kernel.crashing.org>
Date:	Wed, 25 Jul 2007 02:49:14 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Andy Fleming <afleming@...escale.com>,
	Jeff Garzik <jeff@...zik.org>, netdev@...r.kernel.org
Subject: Re: modpost warning question


On Jul 25, 2007, at 2:27 AM, Sam Ravnborg wrote:

> On Wed, Jul 25, 2007 at 02:14:12AM -0500, Kumar Gala wrote:
>> I'm seeing the following warning:
>>
>> WARNING: vmlinux.o(.init.text+0x1acdc): Section mismatch:  
>> reference to
>> .exit.text:gfar_mdio_exit (between 'gfar_init' and 'gfar_mdio_init')
>>
>> I don't understand why its not ok to access .exit.text  
>> from .init.text
>
> Several architectures discards .exit.text in the final linker
> script (arch/$(ARCH)/kernel/vmlinux.lds.S
>
> So any references to .exit.text will when a module is build-in result
> in a linker error because ld will flag it as an error when we  
> reference
> a symbol in a discarded section.
>
> For the popular architectures (i386,x86_64) we discard .exit.text at
> runtime so here we do not see the error from ld (sadly).

Fair point, wondering what we do with .exit on PPC, another thing for  
the list :)

- k
-
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