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Subject: Re: modpost warning question
From: chengong <g.chen@freescale.com>
To: Sam Ravnborg <sam@ravnborg.org>
Cc: Kumar Gala <galak@kernel.crashing.org>, linuxppc-dev@ozlabs.org,
       linux-kernel@vger.kernel.org, Jeff Garzik <jeff@garzik.org>,
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Date: Wed, 25 Jul 2007 18:08:03 +0800
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On Wed, 2007-07-25 at 09:27 +0200, 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.
But why? Just make kernel size smaller?
> 
> For the popular architectures (i386,x86_64) we discard .exit.text at
> runtime so here we do not see the error from ld (sadly).
>>From which version? On my machine I have seen the same problem when
building i386 target with the version 2.6.21.
> 
> 	Sam
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