Improving bindgen for the kernel

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Bindgen is a widely used tool that automatically generates Rust bindings from C headers. The Rust-for-Linux project uses it to create some of the bindings between Rust code and the rest of the kernel. John Baublitz presented at Kangrejos about the improvements that he has made to the tool in order to make the generated bindings easier to use, including improved support for macros, bitfields, and enums.

Baublitz noted that there has been a wishlist of features to add to bindgen for the Rust-for-Linux project for some time. After he ran into some of the same problems in his own projects, he decided to tackle them. There are three main problems that he wants to address: macro expansion, accessing bitfields via raw pointers, and supporting better conversions for Rust enums.

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