linux-kernel - Re: [PATCH 0/2] rust: usb: add initial USB abstractions

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Message-Id: <B4D07104-0A10-4B04-88CC-3F138A783811@collabora.com>
Date: Tue, 23 Sep 2025 14:34:27 +0200
From: Daniel Almeida <daniel.almeida@...labora.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Miguel Ojeda <ojeda@...nel.org>,
 Alex Gaynor <alex.gaynor@...il.com>,
 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>,
 Trevor Gross <tmgross@...ch.edu>,
 Danilo Krummrich <dakr@...nel.org>,
 linux-kernel@...r.kernel.org,
 rust-for-linux@...r.kernel.org,
 linux-usb@...r.kernel.org
Subject: Re: [PATCH 0/2] rust: usb: add initial USB abstractions

[…]

>> 
>> I tried to apply these, but I get the following build error when adding
>> to the char-misc-testing tree:
>> 
>> ld.lld: error: undefined symbol: usb_get_intf
>>>>> referenced by kernel.1a949e63ee2acc6a-cgu.0
>>>>>              rust/kernel.o:(<kernel::usb::Interface as kernel::sync::aref::AlwaysRefCounted>::inc_ref) in archive vmlinux.a
>>>>> referenced by kernel.1a949e63ee2acc6a-cgu.0
>>>>>              rust/kernel.o:(<kernel::sync::aref::ARef<kernel::usb::Interface> as core::convert::From<&kernel::usb::Interface<kernel::device::CoreInternal>>>::from) in archive vmlinux.a
>> 
>> ld.lld: error: undefined symbol: usb_put_intf
>>>>> referenced by kernel.1a949e63ee2acc6a-cgu.0
>>>>>              rust/kernel.o:(<kernel::usb::Interface as kernel::sync::aref::AlwaysRefCounted>::dec_ref) in archive vmlinux.a
>> 
>> ld.lld: error: undefined symbol: usb_get_dev
>>>>> referenced by kernel.1a949e63ee2acc6a-cgu.0
>>>>>              rust/kernel.o:(<kernel::usb::Device as kernel::sync::aref::AlwaysRefCounted>::inc_ref) in archive vmlinux.a
>>>>> referenced by kernel.1a949e63ee2acc6a-cgu.0
>>>>>              rust/kernel.o:(<kernel::sync::aref::ARef<kernel::usb::Device> as core::convert::From<&kernel::usb::Device<kernel::device::CoreInternal>>>::from) in archive vmlinux.a
>> 
>> ld.lld: error: undefined symbol: usb_put_dev
>>>>> referenced by kernel.1a949e63ee2acc6a-cgu.0
>>>>>              rust/kernel.o:(<kernel::usb::Device as kernel::sync::aref::AlwaysRefCounted>::dec_ref) in archive vmlinux.a
>> 
>> 
>> Any hints?
> 
> Did you enable CONFIG_USB?
> 
> Alice

+#[cfg(CONFIG_USB)]
+pub mod usb;

Hmm, but the USB module is gated by #[cfg(CONFIG_USB) in lib.rs, so not having
CONFIG_USB enabled should not return any errors and instead skip the USB
bindings completely.

I wonder if this has to be CONFIG_USB=y?

— Daniel