rust: macros: Add support for 'imports_ns' to module!

Kernel modules that use C symbols exported via `EXPORT_SYMBOL_NS` must
declare this dependency for `modpost` verification. C modules achieve
this by using the `MODULE_IMPORT_NS(NAMESPACE)` macro, which embeds an
`import_ns=<NAMESPACE>` tag into the `.modinfo` section.

The Rust `module!` macro lacked the ability to generate these tags,
resulting in build warnings for Rust drivers (like the PWM driver) that
call namespaced C functions.

Modify the `module!` macro's internal parser (`ModuleInfo`) to accept a
new optional field `imports_ns`, which takes an array of namespace
strings.  Update the code generator (`ModInfoBuilder::emit`) loop to
iterate over these strings and emit the corresponding
`import_ns=<NAMESPACE>` tags into the `.modinfo` section using the
existing `#[link_section]` mechanism.

This provides the necessary infrastructure for Rust modules to correctly
declare their C namespace dependencies.

Signed-off-by: Michal Wilczynski <m.wilczynski@samsung.com>
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Elle Rhumsaa <elle@weathered-steel.dev>
Acked-by: Daniel Gomez <da.gomez@samsung.com>
Link: https://patch.msgid.link/20251028-pwm_fixes-v1-1-25a532d31998@samsung.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/rust/macros/module.rs b/rust/macros/module.rs
index 5ee54a00c0b6..408cd1154875 100644
--- a/rust/macros/module.rs
+++ b/rust/macros/module.rs
@@ -98,6 +98,7 @@ struct ModuleInfo {
     description: Option<String>,
     alias: Option<Vec<String>>,
     firmware: Option<Vec<String>>,
+    imports_ns: Option<Vec<String>>,
 }
 
 impl ModuleInfo {
@@ -112,6 +113,7 @@ impl ModuleInfo {
             "license",
             "alias",
             "firmware",
+            "imports_ns",
         ];
         const REQUIRED_KEYS: &[&str] = &["type", "name", "license"];
         let mut seen_keys = Vec::new();
@@ -137,6 +139,7 @@ impl ModuleInfo {
                 "license" => info.license = expect_string_ascii(it),
                 "alias" => info.alias = Some(expect_string_array(it)),
                 "firmware" => info.firmware = Some(expect_string_array(it)),
+                "imports_ns" => info.imports_ns = Some(expect_string_array(it)),
                 _ => panic!("Unknown key \"{key}\". Valid keys are: {EXPECTED_KEYS:?}."),
             }
 
@@ -195,6 +198,11 @@ pub(crate) fn module(ts: TokenStream) -> TokenStream {
             modinfo.emit("firmware", &fw);
         }
     }
+    if let Some(imports) = info.imports_ns {
+        for ns in imports {
+            modinfo.emit("import_ns", &ns);
+        }
+    }
 
     // Built-in modules also export the `file` modinfo string.
     let file =