Re: Dynamic linking of kernel module bug?

[Jan-Benedict Glaw <jbglaw at lug-owl dot de>]

On Thu, 2004-04-15 15:53:39 +0530, Seshaprasad V <seshaprasad@alumnux.com>
wrote in message <1082024619.3514.147.camel@piper>:
> I am facing an issue, which I feel has something to do with the dynamic
> linking runtime support in linux for loadable kernel modules. Following
> is a description of the issue:
> 
> I have a module which has an extern variable. The variable is declared
> in a statically linked part of the kernel(linux). When i try to load the
> module(using insmod), i get an unresolved symbol error. However when the
> driver is statically linked, i don't get the error. 

Any variable (inside the statically linked kernel image) which modules
may use need to be spacifically exported via the EXPORT_SYMBOL() or
EXPORT_SYMBOL_GPL() macro. This is most probably why your module doesn't
get access to the given variable... But you didn't include a pointer to
your kernel module's source code, so we can't say for sure. (And it's
offtopic, because kernel modules are linked with in-kernel linker code,
which is not the GNU ld code ...)

MfG, JBG

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