Messages in this thread | | | Date | Fri, 2 Jul 2004 10:01:51 -0400 (EDT) | From | "Richard B. Johnson" <> | Subject | Re: Dependant modules question |
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On Fri, 2 Jul 2004, Vladislav Bolkhovitin wrote:
> Hello, > > I need some assistance with the kernel build system. It looks like this > topic is not covered anywhere, at least I didn't find anything. > > I have two modules, A and B, where B is dependant from A, i.e. uses some > exported from it symbols. Both modules are built outside of the kernel > tree. > > With A everything is fine, it's compiled and installed with other kernel > modules in /lib/modules/2.6.7/extra. > > Then module B is built. Here I have a problem. Module A is not listed as > the module from which B depends in .mod.c file, therefore there are > "Undefined symbols" warnings and it is impossible to load B, even though > A is loaded. > > So, the question is: what should I do to make A be seen as exporting > some symbols by the kernel and its build system? > > The kernel is 2.4.7, EXPORT_SYMBOL() used in A as required. > > Thanks, > Vlad
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.
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