Kernel module unable to find an exported symbol

Kernel module unable to find an exported symbol

[David Erickson]

Hi everyone, I have two kernel modules I am developing, both use the
call_rcu exported function. The core module finds it no problem,
installs, and uses it.  The second module however when I try to insmod
it complains:

Unknown symbol call_rcu

I have verified that it is exported via /proc/kallsyms:
c04348c8 T call_rcu

I am at a loss as to how to proceed, can anyone shed some light on how
this could be happening? Or how to diagnose and debug the problem?

Thanks,
David

ps please CC me on a reply, thank you!

Re: Kernel module unable to find an exported symbol

[Dmitri Vorobiev]

David Erickson пишет:
> Hi everyone, I have two kernel modules I am developing, both use the
> call_rcu exported function. The core module finds it no problem,
> installs, and uses it.  The second module however when I try to insmod
> it complains:
> 
> Unknown symbol call_rcu
> 
> I have verified that it is exported via /proc/kallsyms:
> c04348c8 T call_rcu
> 
> I am at a loss as to how to proceed, can anyone shed some light on how
> this could be happening? Or how to diagnose and debug the problem?

It is very much possible that adding the following line to the source
code of your module will help:

MODULE_LICENSE("GPL");

HTH,
Dmitri

> 
> Thanks,
> David
> 
> ps please CC me on a reply, thank you!
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Re: Kernel module unable to find an exported symbol

[David Erickson]

On Sun, Apr 13, 2008 at 2:52 PM, Dmitri Vorobiev<dmitri.vorobiev@gmail.com> wrote:> David Erickson пишет:>> > Hi everyone, I have two kernel modules I am developing, both use the>  > call_rcu exported function. The core module finds it no problem,>  > installs, and uses it.  The second module however when I try to insmod>  > it complains:>  >>  > Unknown symbol call_rcu>  >>  > I have verified that it is exported via /proc/kallsyms:>  > c04348c8 T call_rcu>  >>  > I am at a loss as to how to proceed, can anyone shed some light on how>  > this could be happening? Or how to diagnose and debug the problem?>>  It is very much possible that adding the following line to the source>  code of your module will help:>>  MODULE_LICENSE("GPL");>>  HTH,>  Dmitri
That did the trick, thank you Dmitri!
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