linux-kernel - [PATCH] rust: acpi: remove unneeded cast to clean future Clippy warning

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Message-ID: <20250701174656.62205-1-ojeda@kernel.org>
Date: Tue,  1 Jul 2025 19:46:56 +0200
From: Miguel Ojeda <ojeda@...nel.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Danilo Krummrich <dakr@...nel.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>
Cc: Len Brown <lenb@...nel.org>,
	linux-acpi@...r.kernel.org,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev
Subject: [PATCH] rust: acpi: remove unneeded cast to clean future Clippy warning

A future Clippy warning, `clippy::as_underscore`, is getting enabled in
parallel in the rust-next tree:

    error: using `as _` conversion
      --> rust/kernel/acpi.rs:25:9
       |
    25 |         self.0.driver_data as _
       |         ^^^^^^^^^^^^^^^^^^^^^^-
       |                               |
       |                               help: consider giving the type explicitly: `usize`

The type is already `ulong`, which nowadays is always `usize`, so the
cast is unneeded. Thus remove it, which in turn will avoid the warning
in the future.

Other abstractions of device tables do not use a cast here either.

Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
---
I noticed this in -next -- please feel free to rebase if preferred.

 rust/kernel/acpi.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rust/kernel/acpi.rs b/rust/kernel/acpi.rs
index eaae3bc8e54c..2af4d4f92924 100644
--- a/rust/kernel/acpi.rs
+++ b/rust/kernel/acpi.rs
@@ -22,7 +22,7 @@ unsafe impl RawDeviceId for DeviceId {
     const DRIVER_DATA_OFFSET: usize = core::mem::offset_of!(bindings::acpi_device_id, driver_data);

     fn index(&self) -> usize {
-        self.0.driver_data as _
+        self.0.driver_data
     }
 }


base-commit: f5d3ef25d238901a76fe0277787afa44f7714739
--
2.50.0