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

[Miguel Ojeda]

On Sat, Jan 24, 2026 at 12:35 AM Miguel Ojeda <ojeda@xxxxxxxxxx> 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@xxxxxxxxxxxxxxx
> Signed-off-by: Miguel Ojeda <ojeda@xxxxxxxxxx>

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,
please let me know.

Cheers,
Miguel