linux-kernel - Re: [PATCH v5 01/17] rust: enable `raw_ref

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Message-ID: <20250322150235.1851241-1-contact@antoniohickey.com>
Date: Sat, 22 Mar 2025 11:02:35 -0400
From: Antonio Hickey <contact@...oniohickey.com>
To: benno.lossin@...ton.me
Cc: a.hindborg@...nel.org,
	alex.gaynor@...il.com,
	aliceryhl@...gle.com,
	bjorn3_gh@...tonmail.com,
	boqun.feng@...il.com,
	contact@...oniohickey.com,
	dakr@...nel.org,
	gary@...yguo.net,
	linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	masahiroy@...nel.org,
	nathan@...nel.org,
	nicolas@...sle.eu,
	ojeda@...nel.org,
	rust-for-linux@...r.kernel.org,
	tmgross@...ch.edu
Subject: Re: [PATCH v5 01/17] rust: enable `raw_ref_op` feature 

On Sat, Mar 22, 2025 at 10:16:01AM +0000, Benno Lossin wrote:
> On Thu Mar 20, 2025 at 3:07 AM CET, Antonio Hickey wrote:
> > Since Rust 1.82.0 the `raw_ref_op` feature is stable.
> >
> > By enabling this feature we can use `&raw const place` and
> > `&raw mut place` instead of using `addr_of!(place)` and
> > `addr_of_mut!(place)` macros.
> >
> > Allowing us to reduce macro complexity, and improve consistency
> > with existing reference syntax as `&raw const`, `&raw mut` are
> > similar to `&`, `&mut` making it fit more naturally with other
> > existing code.
> >
> > Suggested-by: Benno Lossin <benno.lossin@...ton.me>
> > Link: https://github.com/Rust-for-Linux/linux/issues/1148
> > Signed-off-by: Antonio Hickey <contact@...oniohickey.com>
> 
> Reviewed-by: Benno Lossin <benno.lossin@...ton.me>
> 
> > diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> > index 993708d11874..a73aaa028e34 100644
> > --- a/scripts/Makefile.build
> > +++ b/scripts/Makefile.build
> > @@ -224,9 +224,9 @@ $(obj)/%.lst: $(obj)/%.c FORCE
> >  	$(call if_changed_dep,cc_lst_c)
> >  
> >  # Compile Rust sources (.rs)
> > -# ---------------------------------------------------------------------------
> > +# --------------------------------------------------------------------------------------
> 
> Not sure about this change.

This change is so I could enable the `raw_ref_op` feature for doctests
since the minimum Rust version 1.78 still has `raw_ref_op` as an
expiramental feature, and will throw errors at compile if a doctest uses
it. Is there a better way to do this?

Thanks,
Antonio

> 
> ---
> Cheers,
> Benno
> 
> >  
> > -rust_allowed_features := asm_const,asm_goto,arbitrary_self_types,lint_reasons
> > +rust_allowed_features := asm_const,asm_goto,arbitrary_self_types,lint_reasons,raw_ref_op
> >  
> >  # `--out-dir` is required to avoid temporaries being created by `rustc` in the
> >  # current working directory, which may be not accessible in the out-of-tree
> 
>