Commit 7dd34dfc authored Feb 24, 2026 by Alexandre Courbot Committed by Shuah Khan Mar 02, 2026

rust: kunit: fix warning when !CONFIG_PRINTK



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 adding a no-op assignment using `args` when `CONFIG_PRINTK`
is not set.

Fixes: a66d733d ("rust: support running Rust documentation tests as KUnit ones")
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: David Gow <david@davidgow.net>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

parent 03464a48

rust/kernel/kunit.rs

+8 −0

Original line number	Diff line number	Diff line
		@@ -14,6 +14,10 @@
		/// Public but hidden since it should only be used from KUnit generated code.
		#[doc(hidden)]
		pub fn err(args: fmt::Arguments<'_>) {
		// `args` is unused if `CONFIG_PRINTK` is not set - this avoids a build-time warning.
		#[cfg(not(CONFIG_PRINTK))]
		let _ = args;

		// SAFETY: The format string is null-terminated and the `%pA` specifier matches the argument we
		// are passing.
		#[cfg(CONFIG_PRINTK)]
		@@ -30,6 +34,10 @@ pub fn err(args: fmt::Arguments<'_>) {
		/// Public but hidden since it should only be used from KUnit generated code.
		#[doc(hidden)]
		pub fn info(args: fmt::Arguments<'_>) {
		// `args` is unused if `CONFIG_PRINTK` is not set - this avoids a build-time warning.
		#[cfg(not(CONFIG_PRINTK))]
		let _ = args;

		// SAFETY: The format string is null-terminated and the `%pA` specifier matches the argument we
		// are passing.
		#[cfg(CONFIG_PRINTK)]