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Miguel Ojeda 376b73292a rust: clean Rust 1.88.0's unnecessary_transmutes lint 
commit 7129ea6e24 upstream.

Starting with Rust 1.88.0 (expected 2025-06-26) [1][2], `rustc` may
introduce a new lint that catches unnecessary transmutes, e.g.:

     error: unnecessary transmute
         --> rust/uapi/uapi_generated.rs:23242:18
          |
    23242 |         unsafe { ::core::mem::transmute(self._bitfield_1.get(0usize, 1u8) as u8) }
          |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace this with: `(self._bitfield_1.get(0usize, 1u8) as u8 == 1)`
          |
          = note: `-D unnecessary-transmutes` implied by `-D warnings`
          = help: to override `-D warnings` add `#[allow(unnecessary_transmutes)]`

There are a lot of them (at least 300), but luckily they are all in
`bindgen`-generated code.

Thus clean all up by allowing it there.

Since unknown lints trigger a lint itself in older compilers, do it
conditionally so that we can keep the `unknown_lints` lint enabled.

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/136083 [1]
Link: https://github.com/rust-lang/rust/issues/136067 [2]
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20250502140237.1659624-4-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-05-18 08:24:51 +02:00
..
bindings rust: clean Rust 1.88.0's unnecessary_transmutes lint 2025-05-18 08:24:51 +02:00
helpers rust: alloc: implement KVmalloc allocator 2025-03-13 13:01:44 +01:00
kernel rust: firmware: Use ffi::c_char type in FwFunc 2025-05-02 07:59:06 +02:00
macros rust: use custom FFI integer types 2025-03-13 13:01:49 +01:00
uapi rust: clean Rust 1.88.0's unnecessary_transmutes lint 2025-05-18 08:24:51 +02:00
.gitignore rust: support running Rust documentation tests as KUnit ones 2023-07-19 09:32:53 -06:00
bindgen_parameters rust: map __kernel_size_t and friends also to usize/isize 2025-03-13 13:01:48 +01:00
build_error.rs rust: add build_error crate 2022-12-04 01:59:16 +01:00
compiler_builtins.rs rust: add intrinsics to fix -Os builds 2024-08-10 00:05:10 +02:00
exports.c kbuild: rust: remove the alloc crate and GlobalAlloc 2025-03-13 13:01:47 +01:00
ffi.rs rust: map long to isize and char to u8 2025-03-13 13:02:13 +01:00
Makefile rust: Fix enabling Rust and building with GCC for LoongArch 2025-04-10 14:39:36 +02:00