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Date: Mon, 19 Dec 2005 21:56:27 -0700 (MST)
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To: sashan@endace.com
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: freebsd-drivers@freebsd.org
Subject: Re: undefined symbols (how to export symobls)
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In message: <43A76FF9.5020402@endace.com>
            sashan <sashan@endace.com> writes:
: Hi
: 
: I'm trying get kernel module B to find a function/symbol S defined in 
: kernel module A. Currently whenever B trys to use S it fails with
: 
: link_elf: symbol <S> undefined
: 
: I've tried adding EXPORT_SYMS = S to the Makefile.
: 
: A is loaded.
: 
: I'm using 5.4-RELEASE.

MODULE_DEPEND is what you need:

MODULE_DEPEND(ed, miibus, 1, 1, 1);

Warner