[PATCH] rust: kunit: fix warning when !CONFIG_PRINTK

[Alexandre Courbot]

If `CONFIG_PRINTK` is not set, then the following warnings are issued
during build:

  warning: unused variable: `args`
    --> ../rust/kernel/kunit.rs:16:12
    |
  16 | pub fn err(args: fmt::Arguments<'_>) {
    |            ^^^^ help: if this is intentional, prefix it with an underscore: `_args`
    |
    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default

  warning: unused variable: `args`
    --> ../rust/kernel/kunit.rs:32:13
    |
  32 | pub fn info(args: fmt::Arguments<'_>) {
    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_args`

Fix this by allowing unused variables on these methods for this
(arguably rare) case.

Fixes: a66d733da801 ("rust: support running Rust documentation tests as KUnit ones")
Signed-off-by: Alexandre Courbot <acourbot@xxxxxxxxxx>
---
 rust/kernel/kunit.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/rust/kernel/kunit.rs b/rust/kernel/kunit.rs
index f93f24a60bdd..5da342f5c84a 100644
--- a/rust/kernel/kunit.rs
+++ b/rust/kernel/kunit.rs
@@ -13,6 +13,8 @@
 ///
 /// Public but hidden since it should only be used from KUnit generated code.
 #[doc(hidden)]
+// `args` is unused if `CONFIG_PRINTK` is not set.
+#[allow(unused_variables)]
 pub fn err(args: fmt::Arguments<'_>) {
     // SAFETY: The format string is null-terminated and the `%pA` specifier matches the argument we
     // are passing.
@@ -29,6 +31,8 @@ pub fn err(args: fmt::Arguments<'_>) {
 ///
 /// Public but hidden since it should only be used from KUnit generated code.
 #[doc(hidden)]
+// `args` is unused if `CONFIG_PRINTK` is not set.
+#[allow(unused_variables)]
 pub fn info(args: fmt::Arguments<'_>) {
     // SAFETY: The format string is null-terminated and the `%pA` specifier matches the argument we
     // are passing.

---
base-commit: 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f
change-id: 20260224-unused_var_err-996d7ffa27c5

Best regards,
-- 
Alexandre Courbot <acourbot@xxxxxxxxxx>