Linux Kernel Module - Creating proc file - proc_root undeclared error

Question

I copy and paste code from this URL for creating and reading/writing a proc file using a kernel module and get the error that proc_root is undeclared. This same example is on a

Answer 1

That example is out of date. Under the current kernel API, pass NULL for the root of procfs.

Also, instead of create_proc_entry, you should use proc_create() with a proper const struct file_operations *.