rust: macros: allow non-ASCII characters in authors

Module authors may have non-ASCII characters in their names. In C,
`MODULE_AUTHOR` allows arbitrary string literals which are emitted as
raw UTF-8 bytes into the `.modinfo` section, and multiple in-tree
modules use non-ASCII author names.

Originally, the single `author` field permitted arbitrary string literals
including non-ASCII characters. When support for multiple authors was
introduced in commit 38559da6af ("rust: module: introduce `authors`
key"), it reused the `expect_string_array` helper that had originally been
added for module aliases. Because that helper enforced an ASCII check,
`authors` inadvertently became restricted to ASCII-only string literals.
Later, when the macro parsing was rewritten to use `syn` in commit
c578ad703a ("rust: macros: use `syn` to parse `module!` macro"), this
restriction was carried over by using AsciiLitStr in `authors` type.

Change the element type of `authors` in `ModuleInfo` from `AsciiLitStr`
to `LitStr` so that UTF-8 author names are permitted.

Fixes: 38559da6af ("rust: module: introduce `authors` key")
Signed-off-by: Thiébaud Weksteen <tweek@google.com>
Acked-by: Petr Pavlu <petr.pavlu@suse.com>
Link: https://patch.msgid.link/20260917051147.98775-1-tweek@google.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

rust/macros/lib.rs

@@ -129,7 +129,7 @@ use syn::parse_macro_input;
 /// # Supported argument types
 ///   - `type`: type which implements the [`Module`] trait (required).
 ///   - `name`: ASCII string literal of the name of the kernel module (required).
-///   - `authors`: array of ASCII string literals of the authors of the kernel module.
+///   - `authors`: array of string literals of the authors of the kernel module.
 ///   - `description`: string literal of the description of the kernel module.
 ///   - `license`: ASCII string literal of the license of the kernel module (required).
 ///   - `alias`: array of ASCII string literals of the alias names of the kernel module.

rust/macros/module.rs

@@ -369,7 +369,7 @@ pub(crate) struct ModuleInfo {
     type_: Type,
     license: AsciiLitStr,
     name: AsciiLitStr,
-    authors: Option<Punctuated<AsciiLitStr, Token![,]>>,
+    authors: Option<Punctuated<LitStr, Token![,]>>,
     description: Option<LitStr>,
     alias: Option<Punctuated<AsciiLitStr, Token![,]>>,
     firmware: Option<Punctuated<AsciiLitStr, Token![,]>>,