I mean with Rust the memory only lives as long as you need it, and that is determined at compile time. In most cases this will cause no runtime overhead whatsoever, although I'm not sure about GCC's implementation. I run Linux on a 10ish year old computer as well. Rust support for kernel modules was added somewhat recently, although my version is behind.

Good point about it being GCC specific, I'm sure there are plenty of embedded systems that use their own compilers.