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Date: Fri, 2 Jul 2004 08:34:57 -0700
From: "Randy.Dunlap" <rddunlap@osdl.org>
To: Vladislav Bolkhovitin <vst@vlnb.net>
Cc: root@chaos.analogic.com, linux-kernel@vger.kernel.org
Subject: Re: Dependant modules question
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On Fri, 02 Jul 2004 18:17:58 +0400 Vladislav Bolkhovitin wrote:

| Richard B. Johnson wrote:
| > Did you execute `depmod -a` after putting your modules into the
| > default  directories and their information into /etc/modules.conf ?
|  >
| > Example:
| > /etc/modules.conf
| > alias char-major-177  module-a		# First to load
| > alias char-major-177  module-b		# Second to load
| > alias char-major-177  off		# All done
| > 
| > 
| > # cp module-a.o /lib/modules/`uname -r`/kernel/drivers/char
| > # cp module-b.o /lib/modules/`uname -r`/kernel/drivers/char
| > # depmod -a
| > 
| > The first time anybody tries to access a device with the major
| > number of 177, its modules will be loaded in the correct order
| > by modprobe.
| > 
| > Cheers,
| > Dick Johnson
| > Penguin : Linux version 2.4.26 on an i686 machine (5570.56 BogoMips).
| >             Note 96.31% of all statistics are fiction.
| 
| Sure, I did. That works fine if A is built in the kernel tree (i.e. the 
| sources of A stays there), not when both A and B are external modules.
| 
| Actually, the problem is a bit different: compiled B know nothing about 
| A and doesn't reffer to it, so depmod and friends can't help. Ever if A 
| already loaded, B refused to load (can't find the symbols). I suspect, I 
| need to add something in the Makefile of A/B/both. But what?

Rusty's module testsuite has a sample/test that might help you.
Look in http://www.kernel.org/pub/linux/kernel/people/rusty/modules/
for module-init-tools-testsuite-3.0.tar.gz  (or bz2).

--
~Randy