rust: device: avoid trailing ; in printing macros

These macros are used like expressions, so they should not emit a
semicolon. This is being turned into a hard error in a future release of
Rust.

    error: trailing semicolon in macro used in expression position
      --> drivers/gpu/nova-core/firmware/fsp.rs:79:34
       |
    79 |                 .inspect_err(|_| dev_err!(dev, "FMC firmware missing '{}' section\n", name))
       |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
       |
       = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
       = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
       = note: this error originates in the macro `dev_err` (in Nightly builds, run with -Z macro-backtrace for more info)

[ I was doubly surprised since upstream made it a deny-by-default lint
  a year ago for Rust 1.91.0, and yet we didn't see it; plus I hadn't
  seen this in my CI even yesterday.

  It turns out this just landed into today's nightly (nightly-2026-07-16,
  using upstream commit d0babd8b6):

Link: https://github.com/rust-lang/rust/pull/159222
  which says:

    "The `semicolon_in_expressions_from_macros` lint previously
     suppressed warnings about non-local macros. This masks
     a lint that will subsequently become a hard error."

  So that explains it. And this is the PR that will make it a hard error
  at some point in the future:

Link: https://github.com/rust-lang/rust/pull/159218
  Thus starting with Rust 1.99.0 (expected 2026-10-01), we will be
  seeing the deny-by-default lint above, so clean it up already.

    - Miguel ]

Cc: stable@vger.kernel.org # Needed in 6.18.y and later.
Link: https://github.com/rust-lang/rust/issues/79813
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Link: https://github.com/rust-lang/rust/pull/159218
Link: https://github.com/rust-lang/rust/pull/159222
Link: https://patch.msgid.link/20260716-device-trail-semicolon-v1-1-f48e9dcfae15@google.com
[ Fixed typo. ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

diff --git a/rust/kernel/device.rs b/rust/kernel/device.rs
index 645afc49a27d642a88314e3649a691f1b0e37c03..1a38b3bbdfb7d8bdf96eab652a88c8727abd541a 100644 (file)
--- a/rust/kernel/device.rs
+++ b/rust/kernel/device.rs
@@ -708,9 +708,7 @@ macro_rules! impl_device_context_into_aref {
 #[macro_export]
 macro_rules! dev_printk {
     ($method:ident, $dev:expr, $($f:tt)*) => {
-        {
-            $crate::device::Device::$method($dev.as_ref(), $crate::prelude::fmt!($($f)*))
-        }
+        $crate::device::Device::$method($dev.as_ref(), $crate::prelude::fmt!($($f)*))
     }
 }
 
@@ -737,7 +735,7 @@ macro_rules! dev_printk {
 /// ```
 #[macro_export]
 macro_rules! dev_emerg {
-    ($($f:tt)*) => { $crate::dev_printk!(pr_emerg, $($f)*); }
+    ($($f:tt)*) => { $crate::dev_printk!(pr_emerg, $($f)*) }
 }
 
 /// Prints an alert-level message (level 1) prefixed with device information.
@@ -763,7 +761,7 @@ macro_rules! dev_emerg {
 /// ```
 #[macro_export]
 macro_rules! dev_alert {
-    ($($f:tt)*) => { $crate::dev_printk!(pr_alert, $($f)*); }
+    ($($f:tt)*) => { $crate::dev_printk!(pr_alert, $($f)*) }
 }
 
 /// Prints a critical-level message (level 2) prefixed with device information.
@@ -789,7 +787,7 @@ macro_rules! dev_alert {
 /// ```
 #[macro_export]
 macro_rules! dev_crit {
-    ($($f:tt)*) => { $crate::dev_printk!(pr_crit, $($f)*); }
+    ($($f:tt)*) => { $crate::dev_printk!(pr_crit, $($f)*) }
 }
 
 /// Prints an error-level message (level 3) prefixed with device information.
@@ -815,7 +813,7 @@ macro_rules! dev_crit {
 /// ```
 #[macro_export]
 macro_rules! dev_err {
-    ($($f:tt)*) => { $crate::dev_printk!(pr_err, $($f)*); }
+    ($($f:tt)*) => { $crate::dev_printk!(pr_err, $($f)*) }
 }
 
 /// Prints a warning-level message (level 4) prefixed with device information.
@@ -841,7 +839,7 @@ macro_rules! dev_err {
 /// ```
 #[macro_export]
 macro_rules! dev_warn {
-    ($($f:tt)*) => { $crate::dev_printk!(pr_warn, $($f)*); }
+    ($($f:tt)*) => { $crate::dev_printk!(pr_warn, $($f)*) }
 }
 
 /// Prints a notice-level message (level 5) prefixed with device information.
@@ -867,7 +865,7 @@ macro_rules! dev_warn {
 /// ```
 #[macro_export]
 macro_rules! dev_notice {
-    ($($f:tt)*) => { $crate::dev_printk!(pr_notice, $($f)*); }
+    ($($f:tt)*) => { $crate::dev_printk!(pr_notice, $($f)*) }
 }
 
 /// Prints an info-level message (level 6) prefixed with device information.
@@ -893,7 +891,7 @@ macro_rules! dev_notice {
 /// ```
 #[macro_export]
 macro_rules! dev_info {
-    ($($f:tt)*) => { $crate::dev_printk!(pr_info, $($f)*); }
+    ($($f:tt)*) => { $crate::dev_printk!(pr_info, $($f)*) }
 }
 
 /// Prints a debug-level message (level 7) prefixed with device information.
@@ -919,5 +917,5 @@ macro_rules! dev_info {
 /// ```
 #[macro_export]
 macro_rules! dev_dbg {
-    ($($f:tt)*) => { $crate::dev_printk!(pr_dbg, $($f)*); }
+    ($($f:tt)*) => { $crate::dev_printk!(pr_dbg, $($f)*) }
 }