How to communicate with a Linux kernel module from user space without littering /dev with new nodes?

Question

What are the ways to communicate with a kernel module from user space? By communication i mean sending information and commands between the kernel module and a user space pr

Answer 1

Third one is add a new syscall, but the two you have written are the preferred ones, I think. I've found this document that might help, but I still think this option is unadvised: http://www.csee.umbc.edu/courses/undergraduate/CMSC421/fall02/burt/projects/howto_add_systemcall.html

Another acceptable option might be sharing memory.