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problems for making kernel module

I got this message during compiling module.


Building modules, stage 2.


WARNING: "tasklist_lock" [ /Red/src/Red.ko] undefined!

make[1]: Leaving directory `/usr/src/linux-headers-2.6.18-4-686'


Actually, Red.ko had made but can not load the module due to the unknown symbol (tasklist_lock).


Whats the problem?? I can see the symbol is exported in the linux-header-2.6.18-4-686/include/linux/sched.h.

I couldnt understand why it is shown undefined??


Also during searching about this problem, I read this - for linux kernel 2.6.18, the symbol does NOT export any more . Is this right???

If it is, is there any way to use the symbol tasklist_lock?


There is my only guess, it is needed the license to use this symbol.




Thanks a lot for any suggestion.


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