linux-kernel - Re: Kernel module unable to find an exported symbol

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Date:	Sun, 13 Apr 2008 14:58:26 -0700
From:	"David Erickson" <halcyon1981@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	"Dmitri Vorobiev" <dmitri.vorobiev@...il.com>
Subject: Re: Kernel module unable to find an exported symbol

On Sun, Apr 13, 2008 at 2:52 PM, Dmitri Vorobiev
<dmitri.vorobiev@...il.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!

-David