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Date: Wed, 17 Jun 2026 17:34:02 +0200
Message-Id: <DJBFN1GFXE75.32363U9Q83CSL@kernel.org>
To: =?utf-8?q?Nicol=C3=A1s_Antinori?= <nico.antinori.7@gmail.com>, "Greg
 Kroah-Hartman" <gregkh@linuxfoundation.org>
From: "Danilo Krummrich" <dakr@kernel.org>
Subject: Re: [PATCH] usb: rust: mark Device and Interface methods as inline
Cc: "Miguel Ojeda" <ojeda@kernel.org>, "Alexandre Courbot"
 <acourbot@nvidia.com>, "Alice Ryhl" <aliceryhl@google.com>, "Andreas
 Hindborg" <a.hindborg@kernel.org>, "Benno Lossin" <lossin@kernel.org>,
 =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= <bjorn3_gh@protonmail.com>, "Boqun Feng"
 <boqun@kernel.org>, "Daniel Almeida" <daniel.almeida@collabora.com>, "Gary
 Guo" <gary@garyguo.net>, =?utf-8?q?Onur_=C3=96zkan?= <work@onurozkan.dev>,
 "Shuah Khan" <skhan@linuxfoundation.org>, "Tamir Duberstein"
 <tamird@kernel.org>, "Trevor Gross" <tmgross@umich.edu>,
 <linux-kernel@vger.kernel.org>, <rust-for-linux@vger.kernel.org>,
 <linux-kernel-mentees@lists.linux.dev>, <linux-usb@vger.kernel.org>
References: <20260616223614.16444-1-nico.antinori.7@gmail.com>
In-Reply-To: <20260616223614.16444-1-nico.antinori.7@gmail.com>

(Cc: Greg, linux-usb)

Looks like the Rust USB code wasn't added to the USB MAINTAINERS entry.

On Wed Jun 17, 2026 at 12:36 AM CEST, Nicol=C3=A1s Antinori wrote:
> When building the kernel using llvm-19.1.7-rust-1.85.1-x86_64, the
> following symbols are generated:
>
> $ nm vmlinux | grep ' _R'.*usb.*Device | rustfilt
> ...
> ffffffff823f2490 T <kernel::usb::Device as kernel::sync::aref::AlwaysRefC=
ounted>::dec_ref
> ffffffff823f2470 T <kernel::usb::Device as kernel::sync::aref::AlwaysRefC=
ounted>::inc_ref
> ...
>
> $ nm vmlinux | grep ' _R'.*usb.*Interface | rustfilt
> ffffffff823f2450 T <kernel::usb::Interface as kernel::sync::aref::AlwaysR=
efCounted>::dec_ref
> ffffffff823f2430 T <kernel::usb::Interface as kernel::sync::aref::AlwaysR=
efCounted>::inc_ref
> ...
>
> However, these Rust symbols are trivial wrappers around the
> `usb_get_dev`, `usb_put_dev`, `usb_get_intf` and `usb_put_intf`
> functions. It doesn't make sense to go through a trivial wrapper
> for these functions.
>
> Link: https://github.com/Rust-for-Linux/linux/issues/1145
> Suggested-by: Alice Ryhl <aliceryhl@google.com>
> Signed-off-by: Nicol=C3=A1s Antinori <nico.antinori.7@gmail.com>