this post was submitted on 21 Feb 2025
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Linus sets his foot down, against the gatekeeping attempts in the kernel (lore.kernel.org)
submitted 2 days ago* (last edited 2 days ago) by snaggen to c/rust
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So let me be very clear: if you as a maintainer feel that you control who or what can use your code, YOU ARE WRONG.

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[–] [email protected] 11 points 2 days ago (2 children)

Gnu C has computed goto.

[–] [email protected] 9 points 1 day ago* (last edited 1 day ago)

That's a performance optimisation which llvm is likely to do for you anyways, jump tables aren't exactly rocket science. Gazing into my crystal ball, might have to turn your enum variant Foo(u8) with possible values 0..15 into Foo0 through Foo15 (or maybe better Foo(EnumWith16Variants)) so that the compiler doesn't have to evaluate code to figure out that it doesn't need to NOP the rest of the jump range out, or bail out of generating a jump table, whatever it would do.

[–] [email protected] 14 points 2 days ago

But is it used in the kernel?