linux-kernel - Re: [PATCH] rust: sync: atomic: Provide stub for `rusttest` 32-bit hosts

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Message-ID: <aXY2UNZAcIdqCxYa@tardis.local>
Date: Sun, 25 Jan 2026 07:27:12 -0800
From: Boqun Feng <boqun.feng@...il.com>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Will Deacon <will@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Mark Rutland <mark.rutland@....com>, Gary Guo <gary@...yguo.net>,
	linux-kernel@...r.kernel.org,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>, rust-for-linux@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] rust: sync: atomic: Provide stub for `rusttest` 32-bit
 hosts

On Sun, Jan 25, 2026 at 03:23:45PM +0100, Miguel Ojeda wrote:
> On Sat, Jan 24, 2026 at 12:35 AM Miguel Ojeda <ojeda@...nel.org> wrote:
> >
> > For arm32, on a x86_64 builder, running the `rusttest` target yields:
> >
> >     error[E0080]: evaluation of constant value failed
> >       --> rust/kernel/static_assert.rs:37:23
> >        |
> >     37 |         const _: () = ::core::assert!($condition $(,$arg)?);
> >        |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'assertion failed: size_of::<isize>() == size_of::<isize_atomic_repr>()', rust/kernel/sync/atomic/predefine.rs:68:1
> >        |
> >       ::: rust/kernel/sync/atomic/predefine.rs:68:1
> >        |
> >     68 | static_assert!(size_of::<isize>() == size_of::<isize_atomic_repr>());
> >        | -------------------------------------------------------------------- in this macro invocation
> >        |
> >        = note: this error originates in the macro `::core::assert` which comes from the expansion of the macro `static_assert` (in Nightly builds, run with -Z macro-backtrace for more info)
> >
> > The reason is that `rusttest` runs on the host, so for e.g. a x86_64
> > builder `isize` is 64 bits but it is not a `CONFIG_64BIT` build.
> >
> > Fix it by providing a stub for `rusttest` as usual.
> >
> > Fixes: 84c6d36bcaf9 ("rust: sync: atomic: Add Atomic<{usize,isize}>")
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
> 
> Boqun et al.: in case it helps, I will send a fixes PR early this
> week, so if you happen to want me to pick this one up with the rest,

Thank you, that'll be great!

Acked-by: Boqun Feng <boqun.feng@...il.com>

Regards,
Boqun

> please let me know.
> 
> Cheers,
> Miguel