[WIP 1/3] rust: Introduce atomic module

[Boqun Feng]

On Sat, Mar 23, 2024 at 12:52:08AM +0100, Andrew Lunn wrote:
> > +//! These primitives should have the same semantics as their C counterparts, for precise definitions
> > +//! of the semantics, please refer to tools/memory-model. Note that Linux Kernel Memory
> > +//! (Consistency) Model is the only model for Rust development in kernel right now, please avoid to
> > +//! use Rust's own atomics.
> 
> Is it possible to somehow poison rusts own atomics?  I would not be

I can continue to look an elegant way, now since we compile our own
`core` crate (where Rust atomic library locates), we can certain do a
sed trick to exclude the atomic code from Rust. It's pretty hacky, but
maybe others know how to teach linter to help.

Regards,
Boqun

> too surprised if somebody with good Rust knowledge but new to the
> kernel tries using Rusts atomics. Either getting the compiler to fail
> the build, or it throws an Opps on first invocation would be good.
> 
>     Andrew