Re: [PATCH] rust: sync: implement Unpin for ARef

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

Hi Alice,

kernel test robot noticed the following build errors:

[auto build test ERROR on 8f0b4cce4481fb22653697cced8d0d04027cb1e8]

url:    https://github.com/intel-lab-lkp/linux/commits/Alice-Ryhl/rust-sync-implement-Unpin-for-ARef/20251218-013900
base:   8f0b4cce4481fb22653697cced8d0d04027cb1e8
patch link:    https://lore.kernel.org/r/20251217-unpin-for-aref-v1-1-84711b747d02%40google.com
patch subject: [PATCH] rust: sync: implement Unpin for ARef
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20251221/202512211302.CuYHRqLX-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/20251221/202512211302.CuYHRqLX-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/202512211302.CuYHRqLX-lkp@intel.com/

All errors (new ones prefixed by >>):

>> error[E0277]: the trait bound `T: sync::aref::AlwaysRefCounted` is not satisfied
   --> rust/kernel/sync/aref.rs:87:19
   |
   87 | impl<T> Unpin for ARef<T> {}
   |                   ^^^^^^^ the trait `sync::aref::AlwaysRefCounted` is not implemented for `T`
   |
   note: required by a bound in `sync::aref::ARef`
   --> rust/kernel/sync/aref.rs:68:20
   |
   68 | pub struct ARef<T: AlwaysRefCounted> {
   |                    ^^^^^^^^^^^^^^^^ required by this bound in `ARef`
   help: consider restricting type parameter `T` with trait `AlwaysRefCounted`
   |
   87 | impl<T: sync::aref::AlwaysRefCounted> Unpin for ARef<T> {}
   |       ++++++++++++++++++++++++++++++

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