Merge tag 'rust-fixes-7.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ojeda/linuxHEADmaster

Pull rust fixes from Miguel Ojeda:
 "Toolchain and infrastructure:

   - 'zerocopy' crates: update to v0.8.54 to fix a modpost error under
     'CONFIG_CC_OPTIMIZE_FOR_SIZE=y'.

     There are actually two updates in the PR: the one to v0.8.52 is
     fairly large and was originally not intended for a fixes PR, but the
     actual fix landed in the v0.8.54 one. Thus I included both here.

     The v0.8.52 update includes two things upstream added for us:
     '--cfg no_fp_fmt_parse' to avoid a local workaround, and the new
     'most_traits' feature.

     The good news is that, after these updates, the delta with upstream
     is now trivial: only an identifier prefix change and the SPDX
     parentheses.

   - Fix an objtool warning by adding one more 'noreturn' function for
     Rust 1.99.0 (expected 2026-10-01).

   - Clean up new 'semicolon_in_expressions_from_macros' lint errors for
     Rust 1.99.0 (expected 2026-10-01). The lint can be allowed, but it
     will be a hard error at some point in the future anyway, so clean it
     up now.

   - Locally allow new 'suspicious_runtime_symbol_definitions' lint for
     Rust 1.98.0 (expected 2026-08-20).

   - Globally allow 'clippy::unwrap_or_default' lint since it relies on
     optimizations -- under 'CONFIG_CC_OPTIMIZE_FOR_SIZE=y' it does not
     work well.

  'kernel' crate:

   - 'time' module: fix 'Delta::as_micros_ceil()' to round negative values
     correctly"

* tag 'rust-fixes-7.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ojeda/linux:
  rust: time: fix as_micros_ceil() to round correctly for negative Delta
  rust: device: avoid trailing ; in printing macros
  objtool/rust: add one more `noreturn` Rust function for Rust 1.99.0
  rust: zerocopy: update to v0.8.54
  rust: zerocopy: update to v0.8.52
  rust: allow `clippy::unwrap_or_default` globally
  rust: allow `suspicious_runtime_symbol_definitions` lint for Rust >= 1.98

2 files changed, 18 insertions, 13 deletions

diff --git a/rust/kernel/device.rs b/rust/kernel/device.rs
index 645afc49a27d..1a38b3bbdfb7 100644
--- 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)*) }
 }
diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs
index 363e93cbb139..b8463823aed9 100644
--- a/rust/kernel/time.rs
+++ b/rust/kernel/time.rs
@@ -441,15 +441,22 @@ impl Delta {
     /// to the value in the [`Delta`].
     #[inline]
     pub fn as_micros_ceil(self) -> i64 {
+        let n = self.as_nanos();
+        let n = if n >= 0 {
+            n.saturating_add(NSEC_PER_USEC - 1)
+        } else {
+            n
+        };
+
         #[cfg(CONFIG_64BIT)]
         {
-            self.as_nanos().saturating_add(NSEC_PER_USEC - 1) / NSEC_PER_USEC
+            n / NSEC_PER_USEC
         }
 
         #[cfg(not(CONFIG_64BIT))]
         // SAFETY: It is always safe to call `ktime_to_us()` with any value.
         unsafe {
-            bindings::ktime_to_us(self.as_nanos().saturating_add(NSEC_PER_USEC - 1))
+            bindings::ktime_to_us(n)
         }
     }