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"But for new code / drivers..." encompasses more than just "drivers" and refers to all new code. I doubt it's a mistake either due to the way the rest of the email is written. And Greg said "no one sane ever thought that (force anyone to learn rust)" just 5 months ago (https://lkml.org/lkml/2024/8/29/312). But he is now telling his C devs they will need to learn and code rust to make new code in the kernel.

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> But he is now telling his C devs they will need to learn and code rust to make new code in the kernel.

I don't think this is accurate, Rust is still totally optional. Also, the Rust folks are supposed to fix Rust code whenever it breaks due to changes on the C side. If they fail to do this, the newly-broken Rust code is supposed to be excluded from the build - up to and including not building any Rust at all.

Yes, I know the policy that has been stated and the recent docs on it (https://rust-for-linux.com/rust-kernel-policy). A good portion of the R4L group were trying to avoid this scenario due the toxicity of such a change (especially at this early contentious point, and despite what their online advocates want). I don't think the policy will immediatly change because of his statements, but I find it pretty clear that this is where he wants the project to go.

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