[PATCH v12 3/3] rust: pwm: Add complete abstraction layer

[Miguel Ojeda]

On Tue, Aug 5, 2025 at 12:29 AM Michal Wilczynski
<m.wilczynski at samsung.com> wrote:
>
> So I did try this and it does work, however it results in a cryptic
> linker error:
> ld.lld: error: undefined symbol: rust_build_error
> >>> referenced by pwm_th1520.2c2c3938312114c-cgu.0
> >>>               drivers/pwm/pwm_th1520.o:(<kernel::pwm::Adapter<pwm_th1520::Th1520PwmDriverData>>::read_waveform_callback) in archive vmlinux.a
> >>> referenced by pwm_th1520.2c2c3938312114c-cgu.0
> >>>               drivers/pwm/pwm_th1520.o:(<kernel::pwm::Adapter<pwm_th1520::Th1520PwmDriverData>>::round_waveform_tohw_callback) in archive vmlinux.a
> make[2]: *** [scripts/Makefile.vmlinux:91: vmlinux] Error 1
>
> I assume this could be fixed at some point to better explain what
> failed?

Yes, it would be nice to improve that -- I keep some references at
https://github.com/Rust-for-Linux/linux/issues/354 ("build_assert").

Ideally we would get some compiler support for those.

Cheers,
Miguel