Re: [PATCH v14 2/9] rust: rename `AlwaysRefCounted` to `RefCounted`.

[kernel test robot <lkp@intel.com>]

Hi Andreas,

kernel test robot noticed the following build errors:

[auto build test ERROR on 63804fed149a6750ffd28610c5c1c98cce6bd377]

url:    https://github.com/intel-lab-lkp/linux/commits/Andreas-Hindborg/rust-types-Add-Ownable-Owned-types/20260204-200041
base:   63804fed149a6750ffd28610c5c1c98cce6bd377
patch link:    https://lore.kernel.org/r/20260204-unique-ref-v14-2-17cb29ebacbb%40kernel.org
patch subject: [PATCH v14 2/9] rust: rename `AlwaysRefCounted` to `RefCounted`.
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20260204/202602042300.Ec1WiMLA-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260204/202602042300.Ec1WiMLA-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602042300.Ec1WiMLA-lkp@intel.com/

All errors (new ones prefixed by >>):

>> error[E0407]: method `inc_ref` is not a member of trait `AlwaysRefCounted`
   --> rust/kernel/usb.rs:378:5
   |
   378 | /     fn inc_ref(&self) {
   ...   |
   383 | |     }
   | |_____^ not a member of trait `AlwaysRefCounted`
--
>> error[E0407]: method `dec_ref` is not a member of trait `AlwaysRefCounted`
   --> rust/kernel/usb.rs:385:5
   |
   385 | /     unsafe fn dec_ref(obj: NonNull<Self>) {
   386 | |         // SAFETY: The safety requirements guarantee that the refcount is non-zero.
   387 | |         unsafe { bindings::usb_put_intf(obj.cast().as_ptr()) }
   388 | |     }
   | |_____^ not a member of trait `AlwaysRefCounted`
--
>> error[E0277]: the trait bound `usb::Interface: sync::aref::RefCounted` is not satisfied
   --> rust/kernel/device.rs:700:17
   |
   700 |                 (&**dev).into()
   |                 ^^^^^^^^^^^^^^^ the trait `sync::aref::RefCounted` is not implemented for `usb::Interface`
   |
   ::: rust/kernel/usb.rs:352:1
   |
   352 | kernel::impl_device_context_into_aref!(Interface);
   | ------------------------------------------------- in this macro invocation
   |
   = help: the following other types implement trait `sync::aref::RefCounted`:
   auxiliary::Device
   block::mq::request::Request<T>
   cred::Credential
   device::Device
   device::property::FwNode
   fs::file::File
   fs::file::LocalFile
   i2c::I2cAdapter
   and 8 others
   note: required by a bound in `sync::aref::ARef`
   --> rust/kernel/sync/aref.rs:86:20
   |
   86  | pub struct ARef<T: RefCounted> {
   |                    ^^^^^^^^^^ required by this bound in `ARef`
   = note: this error originates in the macro `::kernel::__impl_device_context_into_aref` which comes from the expansion of the macro `kernel::impl_device_context_into_aref` (in Nightly builds, run with -Z macro-backtrace for more info)
--
>> error[E0277]: the trait bound `usb::Device: sync::aref::RefCounted` is not satisfied
   --> rust/kernel/device.rs:700:17
   |
   700 |                 (&**dev).into()
   |                 ^^^^^^^^^^^^^^^ the trait `sync::aref::RefCounted` is not implemented for `usb::Device`
   |
   ::: rust/kernel/usb.rs:425:1
   |
   425 | kernel::impl_device_context_into_aref!(Device);
   | ---------------------------------------------- in this macro invocation
   |
   = help: the following other types implement trait `sync::aref::RefCounted`:
   auxiliary::Device
   block::mq::request::Request<T>
   cred::Credential
   device::Device
   device::property::FwNode
   fs::file::File
   fs::file::LocalFile
   i2c::I2cAdapter
   and 8 others
   note: required by a bound in `sync::aref::ARef`
   --> rust/kernel/sync/aref.rs:86:20
   |
   86  | pub struct ARef<T: RefCounted> {
   |                    ^^^^^^^^^^ required by this bound in `ARef`
   = note: this error originates in the macro `::kernel::__impl_device_context_into_aref` which comes from the expansion of the macro `kernel::impl_device_context_into_aref` (in Nightly builds, run with -Z macro-backtrace for more info)
--
>> error[E0407]: method `inc_ref` is not a member of trait `AlwaysRefCounted`
   --> rust/kernel/usb.rs:429:5
   |
   429 | /     fn inc_ref(&self) {
   ...   |
   434 | |     }
   | |_____^ not a member of trait `AlwaysRefCounted`
--
>> error[E0407]: method `dec_ref` is not a member of trait `AlwaysRefCounted`
   --> rust/kernel/usb.rs:436:5
   |
   436 | /     unsafe fn dec_ref(obj: NonNull<Self>) {
   437 | |         // SAFETY: The safety requirements guarantee that the refcount is non-zero.
   438 | |         unsafe { bindings::usb_put_dev(obj.cast().as_ptr()) }
   439 | |     }
   | |_____^ not a member of trait `AlwaysRefCounted`
--
>> error[E0277]: the trait bound `usb::Interface: sync::aref::RefCounted` is not satisfied
   --> rust/kernel/device.rs:698:56
   |
   698 |         impl ::core::convert::From<&$device<$src>> for $crate::sync::aref::ARef<$device> {
   |                                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `sync::aref::RefCounted` is not implemented for `usb::Interface`
   |
   ::: rust/kernel/usb.rs:352:1
   |
   352 | kernel::impl_device_context_into_aref!(Interface);
   | ------------------------------------------------- in this macro invocation
   |
   = help: the following other types implement trait `sync::aref::RefCounted`:
   auxiliary::Device
   block::mq::request::Request<T>
   cred::Credential
   device::Device
   device::property::FwNode
   fs::file::File
   fs::file::LocalFile
   i2c::I2cAdapter
   and 8 others
   note: required by a bound in `sync::aref::ARef`
   --> rust/kernel/sync/aref.rs:86:20
   |
   86  | pub struct ARef<T: RefCounted> {
   |                    ^^^^^^^^^^ required by this bound in `ARef`
   = note: this error originates in the macro `::kernel::__impl_device_context_into_aref` which comes from the expansion of the macro `kernel::impl_device_context_into_aref` (in Nightly builds, run with -Z macro-backtrace for more info)
--
>> error[E0277]: the trait bound `usb::Interface: sync::aref::RefCounted` is not satisfied
   --> rust/kernel/usb.rs:377:34
   |
   377 | unsafe impl AlwaysRefCounted for Interface {
   |                                  ^^^^^^^^^ the trait `sync::aref::RefCounted` is not implemented for `usb::Interface`
   |
   = help: the following other types implement trait `sync::aref::RefCounted`:
   auxiliary::Device
   block::mq::request::Request<T>
   cred::Credential
   device::Device
   device::property::FwNode
   fs::file::File
   fs::file::LocalFile
   i2c::I2cAdapter
   and 8 others
   note: required by a bound in `sync::aref::AlwaysRefCounted`
   --> rust/kernel/sync/aref.rs:74:36
   |
   74  | pub unsafe trait AlwaysRefCounted: RefCounted {}
   |                                    ^^^^^^^^^^ required by this bound in `AlwaysRefCounted`
--
>> error[E0277]: the trait bound `usb::Device: sync::aref::RefCounted` is not satisfied
   --> rust/kernel/device.rs:698:56
   |
   698 |         impl ::core::convert::From<&$device<$src>> for $crate::sync::aref::ARef<$device> {
   |                                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `sync::aref::RefCounted` is not implemented for `usb::Device`
   |
   ::: rust/kernel/usb.rs:425:1
   |
   425 | kernel::impl_device_context_into_aref!(Device);
   | ---------------------------------------------- in this macro invocation
   |
   = help: the following other types implement trait `sync::aref::RefCounted`:
   auxiliary::Device
   block::mq::request::Request<T>
   cred::Credential
   device::Device
   device::property::FwNode
   fs::file::File
   fs::file::LocalFile
   i2c::I2cAdapter
   and 8 others
   note: required by a bound in `sync::aref::ARef`
   --> rust/kernel/sync/aref.rs:86:20
   |
   86  | pub struct ARef<T: RefCounted> {
   |                    ^^^^^^^^^^ required by this bound in `ARef`
   = note: this error originates in the macro `::kernel::__impl_device_context_into_aref` which comes from the expansion of the macro `kernel::impl_device_context_into_aref` (in Nightly builds, run with -Z macro-backtrace for more info)
--
>> error[E0277]: the trait bound `usb::Device: sync::aref::RefCounted` is not satisfied
   --> rust/kernel/usb.rs:428:34
   |
   428 | unsafe impl AlwaysRefCounted for Device {
   |                                  ^^^^^^ the trait `sync::aref::RefCounted` is not implemented for `usb::Device`
   |
   = help: the following other types implement trait `sync::aref::RefCounted`:
   auxiliary::Device
   block::mq::request::Request<T>
   cred::Credential
   device::Device
   device::property::FwNode
   fs::file::File
   fs::file::LocalFile
   i2c::I2cAdapter
   and 8 others
   note: required by a bound in `sync::aref::AlwaysRefCounted`
   --> rust/kernel/sync/aref.rs:74:36
   |
   74  | pub unsafe trait AlwaysRefCounted: RefCounted {}
   |                                    ^^^^^^^^^^ required by this bound in `AlwaysRefCounted`
--
>> error[E0277]: the trait bound `usb::Interface: sync::aref::RefCounted` is not satisfied
   --> rust/kernel/device.rs:699:45
   |
   699 |             fn from(dev: &$device<$src>) -> Self {
   |                                             ^^^^ the trait `sync::aref::RefCounted` is not implemented for `usb::Interface`
   |
   ::: rust/kernel/usb.rs:352:1
   |
   352 | kernel::impl_device_context_into_aref!(Interface);
   | ------------------------------------------------- in this macro invocation
   |
   = help: the following other types implement trait `sync::aref::RefCounted`:
   auxiliary::Device
   block::mq::request::Request<T>
   cred::Credential
   device::Device
   device::property::FwNode
   fs::file::File
   fs::file::LocalFile
   i2c::I2cAdapter
   and 8 others
   note: required by a bound in `sync::aref::ARef`
   --> rust/kernel/sync/aref.rs:86:20
   |
   86  | pub struct ARef<T: RefCounted> {
   |                    ^^^^^^^^^^ required by this bound in `ARef`
   = note: this error originates in the macro `::kernel::__impl_device_context_into_aref` which comes from the expansion of the macro `kernel::impl_device_context_into_aref` (in Nightly builds, run with -Z macro-backtrace for more info)
..

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