On Fri, Feb 28, 2025 at 12:39:29PM +0000, Alice Ryhl wrote: > Rust has two different tools for generating function declarations to > call across the FFI boundary: > > * bindgen. Generates Rust declarations from a C header. > * cbindgen. Generates C headers from Rust declarations. > > In the kernel, we only use bindgen. This is because cbindgen assumes a > cargo-based buildsystem, so it is not compatible with the kernel's build > system. This means that when C code calls a Rust function by name, its > signature must be duplicated in both Rust code and a C header, and the > signature needs to be kept in sync manually. > > To eliminate this manual checking, introduce a new macro that verifies > at compile time that the two function declarations use the same > signature. The idea is to run the C declaration through bindgen, and > then have rustc verify that the function pointers have the same type. > > The main commit of this series is "rust: add #[export] macro". Please > see its commit message for more details. Thanks for the cover letter, makes much more sense now! -- With Best Regards, Andy Shevchenko
