A build with bindgen 0.73.2 and the minimum supported rustc, 1.85.0, emits about 12000 `unknown_lints` warnings, all of them in bindgen's generated output. CONFIG_WERROR or W=e turns them into a failed build. Starting with 0.73.0, bindgen writes `#[allow(unnecessary_transmutes)]` onto every bitfield accessor and constructor it generates. It does so regardless of `--rust-target`, which rust/Makefile already sets to 1.85. That lint exists only since rustc 1.88.0. Commit 7129ea6e242b ("rust: clean Rust 1.88.0's `unnecessary_transmutes` lint") made the kernel's own attribute conditional, to keep `unknown_lints` enabled. That condition cannot be put on an attribute that bindgen writes. Allow `unknown_lints` in the bindings and uapi crates. Cc: stable@vger.kernel.org # Needed in 6.12.y and later (Rust is pinned in older LTSs). Assisted-by: LLM Signed-off-by: John Hubbard --- rust/bindings/lib.rs | 2 ++ rust/uapi/lib.rs | 2 ++ 2 files changed, 4 insertions(+) diff --git a/rust/bindings/lib.rs b/rust/bindings/lib.rs index 812f8e5a08d5..a3af57d7d137 100644 --- a/rust/bindings/lib.rs +++ b/rust/bindings/lib.rs @@ -26,6 +26,8 @@ #[allow(clippy::ptr_as_ptr)] #[allow(clippy::ref_as_ptr)] #[allow(clippy::undocumented_unsafe_blocks)] +// `bindgen` emits `#[allow(...)]` for lints newer than the minimum supported `rustc`. +#[allow(unknown_lints)] #[cfg_attr(CONFIG_RUSTC_HAS_UNNECESSARY_TRANSMUTES, allow(unnecessary_transmutes))] #[cfg_attr( CONFIG_RUSTC_HAS_SUSPICIOUS_RUNTIME_SYMBOL_DEFINITIONS, diff --git a/rust/uapi/lib.rs b/rust/uapi/lib.rs index 797ead5b5626..361b490acc25 100644 --- a/rust/uapi/lib.rs +++ b/rust/uapi/lib.rs @@ -23,6 +23,8 @@ unreachable_pub, unsafe_op_in_unsafe_fn )] +// `bindgen` emits `#[allow(...)]` for lints newer than the minimum supported `rustc`. +#![allow(unknown_lints)] #![cfg_attr(CONFIG_RUSTC_HAS_UNNECESSARY_TRANSMUTES, allow(unnecessary_transmutes))] #![cfg_attr( CONFIG_RUSTC_HAS_SUSPICIOUS_RUNTIME_SYMBOL_DEFINITIONS, base-commit: 3026c6e4f223bdded6448fefe53ff85d9cbe51bd -- 2.55.0