[PATCH 4/4] panic_qr: use new #[export] macro

[Andreas Hindborg]

"Alice Ryhl" <aliceryhl at google.com> writes:

> This validates at compile time that the signatures match what is in the
> header file. It highlights one annoyance with the compile-time check,
> which is that it can only be used with functions marked unsafe.

It would indeed be nice if there was a way to mark some functions to be
emitted as safe by bindgen.

>
> If the function is not unsafe, then this error is emitted:
>
> error[E0308]: `if` and `else` have incompatible types
>    --> <linux>/drivers/gpu/drm/drm_panic_qr.rs:987:19
>     |
> 986 | #[export]
>     | --------- expected because of this
> 987 | pub extern "C" fn drm_panic_qr_max_data_size(version: u8, url_len: usize) -> usize {
>     |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^ expected unsafe fn, found safe fn
>     |
>     = note: expected fn item `unsafe extern "C" fn(_, _) -> _ {kernel::bindings::drm_panic_qr_max_data_size}`
>                found fn item `extern "C" fn(_, _) -> _ {drm_panic_qr_max_data_size}`
>
> Signed-off-by: Alice Ryhl <aliceryhl at google.com>


Reviewed-by: Andreas Hindborg <a.hindborg at kernel.org>


Best regards,
Andreas Hindborg