Re: [PATCH 2/5] rust: clean Rust 1.87.0's `clippy::ptr_eq` lints

[Alice Ryhl <aliceryhl@google.com>]

On Fri, May 02, 2025 at 04:02:34PM +0200, Miguel Ojeda wrote:
> Starting with Rust 1.87.0 (expected 2025-05-15) [1], Clippy may expand
> the `ptr_eq` lint, e.g.:
> 
>     error: use `core::ptr::eq` when comparing raw pointers
>        --> rust/kernel/list.rs:438:12
>         |
>     438 |         if self.first == item {
>         |            ^^^^^^^^^^^^^^^^^^ help: try: `core::ptr::eq(self.first, item)`
>         |
>         = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_eq
>         = note: `-D clippy::ptr-eq` implied by `-D warnings`
>         = help: to override `-D warnings` add `#[allow(clippy::ptr_eq)]`
> 
> Thus clean the few cases we have.
> 
> This patch may not be actually needed by the time Rust 1.87.0 releases
> since a PR to relax the lint has been beta nominated [2] due to reports
> of being too eager (at least by default) [3].
> 
> 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-clippy/pull/14339 [1]
> Link: https://github.com/rust-lang/rust-clippy/pull/14526 [2]
> Link: https://github.com/rust-lang/rust-clippy/issues/14525 [3]
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

For the list file, it might be nice to import core::ptr instead of using
the full path each time. Or maybe just disable this lint.

Alice