Rust 'Foxes' out-of-tree module

This basic module creates a single virtual device called /dev/foxes that continuously outputs the Unicode fox emoji when read. 🦊

It is originally based on the Rust for Linux out-of-tree-module template and JackOS' Rust for Kernel development tutorial.

Adding the Necessary Abstractions

Because the rust branch is no longer maintained on RFL's tree, the abstractions this driver relied on are not yet present.

In order to add them, apply missing-abstractions.diff over RFL's rust-next.

It is very likely that the patch will not apply, especially as further abstractions are added.

Build Instructions After Update

All warnings and considerations from the Rust for Linux foudation's repository apply here. For the sake of efficacy, here are the instructions to build this module on a kernel with Rust support:

$ make KDIR=.../linux-with-rust-support LLVM=1
make -C .../linux-with-rust-support M=$PWD
make[1]: Entering directory '.../linux-with-rust-support'
  RUSTC [M] .../rust-foxes-module/rust_foxes.o
  MODPOST .../rust-foxes-module/Module.symvers
  CC [M]  .../rust-foxes-module/rust_foxes.mod.o
  LD [M]  .../rust-foxes-module/rust_foxes.ko
make[1]: Leaving directory '.../linux-with-rust-support'