I’m still kind of on the fence about Rust in the kernel. Linux isn’t some random hobby project, there are serious people working for serious companies in the project. Rust has a clear value proposition w.r.t. it’s qualities as a language, but I don’t think it’s as clear on a system level.

Say I’m working for a large company as a dev, maintaining a subsystem (let’s say a driver). Letting other people (filthy casual hobbyists) mess around with their filthy type safety will eventually spill into my subsystem and cause extra work. I don’t want the extra work, I just want to have my driver working and then go home. And even if I’m okay with the extra work, my boss won’t be. Even the risk of extra costs down the line will be enough for some to shut it down completely.

There are boring people working for huge corporations with huge stakes in the Linux kernel. I don’t think they see that much value in Rust at the moment, and I think the Rust crowd might need to hire some MBAs if they want to expand their presence in the kernel.