On Tue, Feb 24, 2026 at 04:45:30PM +0900, Alexandre Courbot wrote:
> 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 <[email protected]>
I think this would be a better fix:
diff --git a/rust/kernel/kunit.rs b/rust/kernel/kunit.rs
index f93f24a60bdd..dbf3c62ffa09 100644
--- a/rust/kernel/kunit.rs
+++ b/rust/kernel/kunit.rs
@@ -23,6 +23,9 @@ pub fn err(args: fmt::Arguments<'_>) {
core::ptr::from_ref(&args).cast::<c_void>(),
);
}
+
+ #[cfg(not(CONFIG_PRINTK))]
+ let _ = args;
}
/// Prints a KUnit info-level message.
@@ -39,6 +42,9 @@ pub fn info(args: fmt::Arguments<'_>) {
core::ptr::from_ref(&args).cast::<c_void>(),
);
}
+
+ #[cfg(not(CONFIG_PRINTK))]
+ let _ = args;
}
/// Asserts that a boolean expression is `true` at runtime.
