Call a kernel module function from program at user space?

There is complete overview of linux-kernel module and user-space program interacting http://people.ee.ethz.ch/~arkeller/linux/kernel_user_space_howto.html (it is from 2008, but about 2.6 kernels; only major new way is relayfs ).

You seem to be missing the point of kernel and userland separation. If your user program could modify data inside the kernel directly, that would quickly lead to disaster.

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