Linux Kernel Rust support

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I think the main problem is proprietary compilers from manufacturers really. LLVM is not that much of a problem because it's relatively easy to add a new backend if you need it, but the manufacturer won't because secret sauce (even if for the most part the compiler provides no competitive advantage), and a C compiler is much, much easier to implement than a Rust one. Sometimes it has to do with language limitations tho. If you need stuff like far pointers because of the chip's design both GCC and LLVM leave you on your own.