Re: modpost warning question

On Wed, Jul 25, 2007 at 06:08:03PM +0800, chengong wrote:

On Wed, 2007-07-25 at 09:27 +0200, Sam Ravnborg wrote:

quoted

On Wed, Jul 25, 2007 at 02:14:12AM -0500, Kumar Gala wrote:

quoted

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?

Yes - that the whole goal of init/exit sections.

quoted

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.

modpost has started to warn about it. I assume you did not see link errors.

	Sam