Re: [PATCH v5] rust: aref: make `AlwaysRefCounted::inc_ref` an associated function

Hi Trevor,

kernel test robot noticed the following build errors:

[auto build test ERROR on driver-core/driver-core-linus]
[also build test ERROR on rust/rust-next akpm-mm/mm-everything linus/master v7.2-rc7]
[cannot apply to driver-core/driver-core-testing driver-core/driver-core-next drm/drm-next next-20260811]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Trevor-Chan/rust-aref-make-AlwaysRefCounted-inc_ref-an-associated-function/20260812-112718
base:   driver-core/driver-core-linus
patch link:    https://lore.kernel.org/r/20260628092853.16550-1-trev%40trevrosa.dev
patch subject: [PATCH v5] rust: aref: make `AlwaysRefCounted::inc_ref` an associated function
config: x86_64-randconfig-016-20260812 (https://download.01.org/0day-ci/archive/20260813/[email protected]/config)
compiler: clang version 22.1.3 (https://github.com/llvm/llvm-project e9846648fd6183ee6d8cbdb4502213fcf902a211)
rustc: rustc 1.96.0 (ac68faa20 2026-05-25)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260813/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

>> error[E0185]: method `inc_ref` has a `&self` declaration in the impl, but not in the trait
   --> rust/kernel/opp.rs:1046:5
   |
   1046 |     fn inc_ref(&self) {
   |     ^^^^^^^^^^^^^^^^^ `&self` used in impl
   |
   ::: rust/kernel/sync/aref.rs:50:5
   |
   50 |     fn inc_ref(obj: &Self);
   |     ----------------------- trait method declared without `&self`

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