Re: [PATCH] rust: bitfield: always inline test conversions

["Gary Guo" <gary@garyguo.net>]

On Fri Aug 7, 2026 at 6:50 PM BST, Miguel Ojeda wrote:
> From: Antoni Boucher <bouanto@zoho.com>
> 
> When using the Rust GCC backend (i.e. `rustc_codegen_gcc`), GCC does not
> inline enough these `Bounded::from_expr` calls:
> 
>     /usr/bin/x86_64-linux-gnu-ld.bfd: rust/kernel.o: in function `<kernel::num::bounded::Bounded<u16, 2> as core::convert::From<kernel::bitfield::tests::Priority>>::from':
>     fake.c:(.text.unlikely+0x7be): undefined reference to `rust_build_error'
> 
>     /usr/bin/x86_64-linux-gnu-ld.bfd: rust/kernel.o: in function `<kernel::num::bounded::Bounded<u64, 4> as core::convert::From<kernel::bitfield::tests::MemoryType>>::from':
>     fake.c:(.text.unlikely+0x90d): undefined reference to `rust_build_error'
> 
> Thus, similar to commit bc197e24a3ac ("rust: num: bounded: Always inline
> fits_within and from_expr"), mark them as `#[inline(always)]`.
> 
> Assisted-by: Claude:claude-opus-4-8
> Signed-off-by: Antoni Boucher <bouanto@zoho.com>
> [ Reworded to add the error and to follow our usual style and sent on
>   behalf of Antoni, who found this during his work to support Rust for
>   Linux with the GCC backend, i.e. with `rustc_codegen_gcc`.- Miguel ]
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Reviewed-by: Gary Guo <gary@garyguo.net>

> ---
>  rust/kernel/bitfield.rs | 2 ++
>  1 file changed, 2 insertions(+)