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

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Message-ID: <CANiq72mQEeW4dN0_QvB1=F2cnOe7=56q9mG=y+g1CznASG32xA@mail.gmail.com>
Date: Mon, 26 Jan 2026 04:09:19 +0100
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Miguel Ojeda <ojeda@...nel.org>
Cc: Will Deacon <will@...nel.org>, Peter Zijlstra <peterz@...radead.org>, 
	Boqun Feng <boqun.feng@...il.com>, 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 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>

Applied to `rust-fixes`-- thanks everyone!

Cheers,
Miguel