[PATCH v3 1/5] rust: fix signature of rust_fmt_argument

[Petr Mladek]

On Mon 2025-03-03 08:45:12, Alice Ryhl wrote:
> Without this change, the rest of this series will emit the following
> error message:
> 
> error[E0308]: `if` and `else` have incompatible types
>   --> <linux>/rust/kernel/print.rs:22:22
>    |
> 21 | #[export]
>    | --------- expected because of this
> 22 | unsafe extern "C" fn rust_fmt_argument(
>    |                      ^^^^^^^^^^^^^^^^^ expected `u8`, found `i8`
>    |
>    = note: expected fn item `unsafe extern "C" fn(*mut u8, *mut u8, *mut c_void) -> *mut u8 {bindings::rust_fmt_argument}`
>               found fn item `unsafe extern "C" fn(*mut i8, *mut i8, *const c_void) -> *mut i8 {print::rust_fmt_argument}`
> 
> The error may be different depending on the architecture.
> 
> To fix this, change the void pointer argument to use a const pointer,
> and change the imports to use crate::ffi instead of core::ffi for
> integer types.
> 
> Fixes: 787983da7718 ("vsprintf: add new `%pA` format specifier")
> Reviewed-by: Tamir Duberstein <tamird at gmail.com>
> Acked-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
> Signed-off-by: Alice Ryhl <aliceryhl at google.com>

Acked-by: Petr Mladek <pmladek at suse.com>

Best Regards,
Petr