Miguel Ojeda 7498159226 rust: use #[used(compiler)] to fix build and modpost with Rust >= 1.89.0 ... Starting with Rust 1.89.0 (expected 2025-08-07), the Rust compiler fails to build the `rusttest` target due to undefined references such as: kernel...-cgu.0:(.text....+0x116): undefined reference to `rust_helper_kunit_get_current_test' Moreover, tooling like `modpost` gets confused: WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/gpu/drm/nova/nova.o ERROR: modpost: missing MODULE_LICENSE() in drivers/gpu/nova-core/nova_core.o The reason behind both issues is that the Rust compiler will now [1] treat `#[used]` as `#[used(linker)]` instead of `#[used(compiler)]` for our targets. This means that the retain section flag (`R`, `SHF_GNU_RETAIN`) will be used and that they will be marked as `unique` too, with different IDs. In turn, that means we end up with undefined references that did not get discarded in `rusttest` and that multiple `.modinfo` sections are generated, which confuse tooling like `modpost` because they only expect one. Thus start using `#[used(compiler)]` to keep the previous behavior and to be explicit about what we want. Sadly, it is an unstable feature (`used_with_arg`) [2] -- we will talk to upstream Rust about it. The good news is that it has been available for a long time (Rust >= 1.60) [3]. The changes should also be fine for previous Rust versions, since they behave the same way as before [4]. Alternatively, we could use `#[no_mangle]` or `#[export_name = ...]` since those still behave like `#[used(compiler)]`, but of course it is not really what we want to express, and it requires other changes to avoid symbol conflicts. Cc: David Wood <david@davidtw.co> Cc: Wesley Wiser <wwiser@gmail.com> Cc: stable@vger.kernel.org # Needed in 6.12.y and later (Rust is pinned in older LTSs). Link: https://github.com/rust-lang/rust/pull/140872 [1] Link: https://github.com/rust-lang/rust/issues/93798 [2] Link: https://github.com/rust-lang/rust/pull/91504 [3] Link: https://godbolt.org/z/sxzWTMfzW [4] Reviewed-by: Alice Ryhl <aliceryhl@google.com> Acked-by: Björn Roy Baron <bjorn3_gh@protonmail.com> Link: https://lore.kernel.org/r/20250712160103.1244945-3-ojeda@kernel.org Signed-off-by: Miguel Ojeda <ojeda@kernel.org>		2025-07-14 23:30:44 +02:00
..
concat_idents.rs
export.rs	rust: add #[export] macro	2025-03-09 20:52:46 +01:00
helpers.rs	rust: kunit: support KUnit-mapped assert! macros in #[test]s	2025-05-27 20:07:09 +02:00
kunit.rs	rust: kunit: support checked -> Results in KUnit #[test]s	2025-05-27 20:09:59 +02:00
lib.rs	rust: add kunit_tests to the prelude	2025-05-27 20:09:59 +02:00
module.rs	rust: use #[used(compiler)] to fix build and modpost with Rust >= 1.89.0	2025-07-14 23:30:44 +02:00
paste.rs	rust: clean Rust 1.88.0's clippy::uninlined_format_args lint	2025-05-07 00:11:47 +02:00
quote.rs	rust: make pin-init its own crate	2025-03-16 21:59:19 +01:00
vtable.rs