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Mixing Rust and C in Linux likened to cancer by maintainer
(www.theregister.com)
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this post was submitted on 06 Feb 2025
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Basically just "but two languages is HARD"
I'd even have sympathy for this argument that introducing another language is a major undertaking (and it is!) but Linux is already full of lots of other languages (Macros, Makefile, Shell, BPF, assembly languages, Perl, Python scripts...) and developers are willing to do the work to use a language that helps solve problems Linux cares about.
That's not a good argument. Most of these additional languages are used for separate things, like build scripts and stuff. They don't affect actual kernel code which is C and assembler language.
Your argument is completely specious. Re-read that list. Assembly is a second language in the kernel already, and really it's multiple languages, one per supported ISA. Perl and Python scripts are used to generate data tables; there are multiple build-time languages. eBPF is evaluated at runtime; the kernel contains bytecode loaders, JIT compilers, and capability management for it. The kernel has already paid the initial cost of setting up a chimeric build process which evaluates many different languages at many different stages.