[PATCH] rust: allow `clippy::as_underscore` in the generated bindings

[John Hubbard]

A CLIPPY=1 build emitted about 15000 `as _` conversion warnings, all of
them in bindgen's generated output and none in hand-written code.

bindgen 0.73 returns each bitfield read through a trailing `as _`, and
0.72 returns it through a transmute, which the lint ignores. The
bindings and uapi crates allow `clippy::all` over the generated code.
That group does not cover `clippy::as_underscore`, a restriction lint.

The minimum supported bindgen is 0.71.1, and 0.72 does not emit the
cast, so upstream CI may not see these warnings yet.

Allow `clippy::as_underscore` by name in the bindings and uapi crates.

Assisted-by: LLM
Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
---
 rust/bindings/lib.rs | 1 +
 rust/uapi/lib.rs     | 1 +
 2 files changed, 2 insertions(+)

diff --git a/rust/bindings/lib.rs b/rust/bindings/lib.rs
index 812f8e5a08d5..ad24c920b919 100644
--- a/rust/bindings/lib.rs
+++ b/rust/bindings/lib.rs
@@ -22,6 +22,7 @@
 #![feature(cfi_encoding)]
 
 #[allow(dead_code)]
+#[allow(clippy::as_underscore)]
 #[allow(clippy::cast_lossless)]
 #[allow(clippy::ptr_as_ptr)]
 #[allow(clippy::ref_as_ptr)]
diff --git a/rust/uapi/lib.rs b/rust/uapi/lib.rs
index 797ead5b5626..2df0340e63d1 100644
--- a/rust/uapi/lib.rs
+++ b/rust/uapi/lib.rs
@@ -10,6 +10,7 @@
 #![no_std]
 #![allow(
     clippy::all,
+    clippy::as_underscore,
     clippy::cast_lossless,
     clippy::ptr_as_ptr,
     clippy::ref_as_ptr,

base-commit: 1676a4478e434d43f8cab79587becd16d3e86552
-- 
2.55.0