[jfern:nova/mm 6/31] error[E0133]: access to union field is unsafe and requires unsafe block

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git nova/mm
head:   d44aeb89db2e47449220a4721f5e89202bd7b128
commit: 6e05d1c7b5efa36e6e1c8581e1645c00eb6ab0f9 [6/31] rust: gpu: Add GPU buddy allocator bindings
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20260221/202602210130.86eZe0Gi-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/20260221/202602210130.86eZe0Gi-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/202602210130.86eZe0Gi-lkp@intel.com/

All errors (new ones prefixed by >>):

>> error[E0133]: access to union field is unsafe and requires unsafe block
   --> rust/kernel/ffi/clist.rs:331:28
   |
   331 |               |p| &raw const (*p).$($field).+;
   |                              ^^^^^^^^^^^^^ access to union field
   |
   ::: rust/kernel/gpu/buddy.rs:433:21
   |
   433 |           let clist = clist_create!(unsafe {
   |  _____________________-
   434 | |             self.list.as_raw(),
   435 | |             Block,
   436 | |             bindings::gpu_buddy_block,
   437 | |             __bindgen_anon_1.link
   438 | |         });
   | |__________- in this macro invocation
   |
   = note: the field may not be properly initialized: using uninitialized data will cause undefined behavior
   = note: this error originates in the macro `clist_create` (in Nightly builds, run with -Z macro-backtrace for more info)

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki