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debugfs : Unknown symbol debugfs_create_dir

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DAVER:
Hi,
    I'm using Ubuntu 12.04 and i was trying to debug the kernel using debugs. I have compiled the kernel with required options like,


--- Code: ---Kernel hacking[*] Magic SysRq key
Kernel hacking[*] Debug filesystem
--- End code ---

I have written a module which include kernel linked list and kernel threads. The module works fine. Then i have added the debugfs code in the same module and i got the following error while inserting the module(i.e. during insmod command),

--- Code: ---insmod: error inserting 'kll.ko': -1 Unknown symbol in module
--- End code ---

I have checked dmesg and i found that the debufs calls like debugfs_create_dir are said to be unknown...

Now I'm stuck at this point.

Any pointers or help is welcome!!

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