linux-kernel - Re: [PATCH] rust: bitmap: clean Rust 1.92.0 `unused

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Message-ID: <aO54nxGil6a5hLQN@google.com>
Date: Tue, 14 Oct 2025 16:21:51 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Yury Norov <yury.norov@...il.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, Burak Emir <bqe@...gle.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	"Björn Roy Baron" <bjorn3_gh@...tonmail.com>, Benno Lossin <lossin@...nel.org>, 
	Andreas Hindborg <a.hindborg@...nel.org>, Trevor Gross <tmgross@...ch.edu>, 
	Danilo Krummrich <dakr@...nel.org>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org, patches@...ts.linux.dev
Subject: Re: [PATCH] rust: bitmap: clean Rust 1.92.0 `unused_unsafe` warning

On Tue, Oct 14, 2025 at 12:09:09PM -0400, Yury Norov wrote:
> On Mon, Oct 13, 2025 at 09:20:15AM +0000, Alice Ryhl wrote:
> > On Mon, Oct 13, 2025 at 02:14:22AM +0200, Miguel Ojeda wrote:
> > > Starting with Rust 1.92.0 (expected 2025-12-11), Rust allows to safely
> > > take the address of a union field [1][2]:
> > > 
> > >       CLIPPY L rust/kernel.o
> > >     error: unnecessary `unsafe` block
> > >        --> rust/kernel/bitmap.rs:169:13
> > >         |
> > >     169 |             unsafe { core::ptr::addr_of!(self.repr.bitmap) }
> > >         |             ^^^^^^ unnecessary `unsafe` block
> > >         |
> > >         = note: `-D unused-unsafe` implied by `-D warnings`
> > >         = help: to override `-D warnings` add `#[allow(unused_unsafe)]`
> > > 
> > >     error: unnecessary `unsafe` block
> > >        --> rust/kernel/bitmap.rs:185:13
> > >         |
> > >     185 |             unsafe { core::ptr::addr_of_mut!(self.repr.bitmap) }
> > >         |             ^^^^^^ unnecessary `unsafe` block
> > > 
> > > Thus allow both instances to clean the warning in newer compilers.
> > > 
> > > Link: https://github.com/rust-lang/rust/issues/141264 [1]
> > > Link: https://github.com/rust-lang/rust/pull/141469 [2]
> > > Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
> > 
> > Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>
> 
> Added in bitmap-for-next.

Is there any possibility of landing this for an -rc of 6.18 instead of
for 6.19-rc1? That way, the warning won't be present when compiling 6.18
with rustc 1.92.0 and newer.

Alice