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

1 files changed, 35 insertions, 1 deletions

diff --git a/rust/zerocopy-derive/lib.rs b/rust/zerocopy-derive/lib.rs
index c517ea7db1eb..d387de368367 100644
--- a/rust/zerocopy-derive/lib.rs
+++ b/rust/zerocopy-derive/lib.rs
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2019 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
@@ -129,6 +129,40 @@ derive!(ByteHash => derive_hash => crate::derive::derive_hash);
 derive!(ByteEq => derive_eq => crate::derive::derive_eq);
 derive!(SplitAt => derive_split_at => crate::derive::derive_split_at);
 
+#[cfg_attr(not(zerocopy_unstable_linux), doc(hidden))]
+#[proc_macro_derive(most_traits, attributes(zerocopy))]
+pub fn most_traits(ts: proc_macro::TokenStream) -> proc_macro::TokenStream {
+    let ast = syn::parse_macro_input!(ts as DeriveInput);
+    let ctx = match Ctx::try_from_derive_input(ast) {
+        Ok(ctx) => ctx,
+        Err(e) => return e.into_compile_error().into(),
+    }
+    .skip_on_error();
+
+    // top-level traits for which to attempt a derive
+    let derives: [(fn(&Ctx, Trait) -> _, _); 6] = [
+        (crate::derive::known_layout::derive, Trait::KnownLayout),
+        (crate::derive::derive_immutable, Trait::Immutable),
+        (crate::derive::from_bytes::derive_from_bytes, Trait::FromBytes),
+        (crate::derive::into_bytes::derive_into_bytes, Trait::IntoBytes),
+        (crate::derive::derive_split_at, Trait::SplitAt),
+        (crate::derive::unaligned::derive_unaligned, Trait::Unaligned),
+    ];
+
+    let mut tokens = proc_macro2::TokenStream::new();
+    for (derive, t) in derives {
+        tokens.extend(derive(&ctx, t))
+    }
+
+    // We wrap in `const_block` as a backstop in case any derive fails
+    // to wrap its output in `const_block` (and thus fails to annotate)
+    // with the full set of `#[allow(...)]` attributes).
+    let ts = const_block([Some(tokens)]);
+    #[cfg(test)]
+    crate::util::testutil::check_hygiene(ts.clone());
+    ts.into()
+}
+
 /// Deprecated: prefer [`FromZeros`] instead.
 #[deprecated(since = "0.8.0", note = "`FromZeroes` was renamed to `FromZeros`")]
 #[doc(hidden)]