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Why Rust/C++?

The Linux kernel is written in C, Linus has historically made his dislike of C++ clear as well

Rust would be reasonable but its inclusion in the kernel at this point is "that's a good idea!" rather than "that's a thing being done right now in kernel.org kernels"

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This is the userspace part of the driver, not the kernelspace part; the existing open-source graphics drivers already are (for the most part) in C++, because extern "C" is less of a pain than writing a compiler in pure C

The majority of a GPU driver doesn't live in the kernel, but in userspace (part of the Mesa library).

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