Hi, On Tue, Sep 13, 2011 at 4:24 AM, Jorgyano Bruno <jorgyano@gmail.com> wrote:

On Tue, Sep 13, 2011 at 6:06 AM, kashish bhatia <koolest77@gmail.com> wrote:

...

Hi all, I am trying to port a kernel module from 2.6.23 kernel to 2.6.32 kernel.

While inserting the module , it shows an error :

insmod : error inserting 'module.ko'  : -1 Unknown symbol in module

I checked in /var/log/messages for the unknown symbol and it shows,

module : no symbol version for function_name

Can anybody explain what is this error and how to resolve this error ?

-- Thanks & Regards, Kashish Bhatia

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Are you building it out of tree?

Your module is trying to use an exported symbol, perhaps it is a symbol exported from another module, for cases like this  modprobe works better than insmod. Try modprobe and it should works.

The other reason that it might appear to be missing a symbol is because the symbol is exported as a GPL symbol, and you're missing the MODULE_LICENSE( "GPL" ); in your module. -- Dave Hylands Shuswap, BC, Canada http://www.davehylands.com

Hi! On Tue, Sep 13, 2011 at 2:19 PM, kashish bhatia <koolest77@gmail.com> wrote:

Hi, There is no licensing mistake because I already included MODULE_LICENSE( "GPL" ); in my module.

I also verified the exported symbol. There is an entry for the exported symbol in kallsyms.

Is there any other reason of getting this kind of error?

-- Regards, Kashish

This link helped me when I had the same problem compiling out-of-tree modules: http://lists.busybox.net/pipermail/busybox/2009-April/068855.html Best Regards ----[ Jorgyano