If you are running a kernel module that was written before the kernel 2.6.17 was released, you might see code using the tasklist
rcu(tasklist_lock) , rcu(tasklist_unlock).
The codes that do use there symbols will not compile in the kernels after 2.6.17 cause, tasklist is not longer exported by the kernel . So the modules do not have access to the symbols tasklist_lock and tasklist_unlock
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