linux-kernel - Re: [WIP 1/3] rust: Introduce atomic module

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Date: Tue, 26 Mar 2024 01:56:48 -0400
From: Trevor Gross <tmgross@...ch.edu>
To: Andrew Lunn <andrew@...n.ch>
Cc: Alice Ryhl <aliceryhl@...gle.com>, Boqun Feng <boqun.feng@...il.com>, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arch@...r.kernel.org, llvm@...ts.linux.dev, 
	Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Wedson Almeida Filho <wedsonaf@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...sung.com>, 
	Alan Stern <stern@...land.harvard.edu>, Andrea Parri <parri.andrea@...il.com>, 
	Will Deacon <will@...nel.org>, Peter Zijlstra <peterz@...radead.org>, 
	Nicholas Piggin <npiggin@...il.com>, David Howells <dhowells@...hat.com>, 
	Jade Alglave <j.alglave@....ac.uk>, Luc Maranget <luc.maranget@...ia.fr>, 
	"Paul E. McKenney" <paulmck@...nel.org>, Akira Yokosawa <akiyks@...il.com>, 
	Daniel Lustig <dlustig@...dia.com>, Joel Fernandes <joel@...lfernandes.org>, 
	Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, kent.overstreet@...il.com, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, elver@...gle.com, 
	Mark Rutland <mark.rutland@....com>, Thomas Gleixner <tglx@...utronix.de>, 
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"H. Peter Anvin" <hpa@...or.com>, Catalin Marinas <catalin.marinas@....com>, torvalds@...ux-foundation.org, 
	linux-arm-kernel@...ts.infradead.org, linux-fsdevel@...r.kernel.org
Subject: Re: [WIP 1/3] rust: Introduce atomic module

On Sat, Mar 23, 2024 at 10:10 AM Andrew Lunn <andrew@...n.ch> wrote:
> > > Is it possible to somehow poison rusts own atomics?  I would not be
> > > 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.
> >
> > We could try to get a flag added to the Rust standard library that
> > removes the core::sync::atomic module entirely, then pass that flag.
>
> Just looking down the road a bit, are there other features in the
> standard library which are not applicable to Linux kernel space?
> Ideally we want a solution not just for atomics but a generic solution
> which can disable a collection of features? Maybe one by one?

Clippy is an easy way to do this via the disallowed_* lints.
disallowed_types [1] would be applicable here to forbid
`core::atomic::Atomic*`.

I don't think KCI currently checks clippy, but we probably want that
at some point.

- Trevor

[1]: https://rust-lang.github.io/rust-clippy/master/index.html#/disallowed_types

> And i assume somebody will try to use Rust in uboot/barebox. It
> probably has similar requirements to the Linux kernel? But what about
> Zephyr? Or VxWorks? Darwin?
>
>         Andrew
>