ld.lld: error: undefined symbol: mem_cgroup_dmem_uncharge

ld.lld: error: undefined symbol: mem_cgroup_dmem_uncharge

[kernel test robot]

:::::: 
:::::: Manual check reason: "bisect to a FBC not belonging to original linux-review patches: branch: linux-review/Eric-Chanudet/mm-memcontrol-add-dmem-charge-uncharge-functions/20260520-000345, commit: 8c23ade377046c937570c234116eb210372657dd"
:::::: 

BCC: lkp@intel.com
CC: llvm@lists.linux.dev
CC: oe-kbuild-all@lists.linux.dev
TO: Eric Chanudet <echanude@redhat.com>
CC: 0day robot <lkp@intel.com>

tree:   https://github.com/intel-lab-lkp/linux/commits/Eric-Chanudet/mm-memcontrol-add-dmem-charge-uncharge-functions/20260520-000345
head:   8c23ade377046c937570c234116eb210372657dd
commit: 8c23ade377046c937570c234116eb210372657dd cgroup/dmem: add dmem.memcg control file for double-charging to memcg
date:   17 hours ago
:::::: branch date: 17 hours ago
:::::: commit date: 17 hours ago
config: s390-randconfig-002-20260520 (https://download.01.org/0day-ci/archive/20260520/202605201625.uzCWM4Cw-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260520/202605201625.uzCWM4Cw-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/r/202605201625.uzCWM4Cw-lkp@intel.com/

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: mem_cgroup_dmem_uncharge
   >>> referenced by dmem.c:674 (kernel/cgroup/dmem.c:674)
   >>>               kernel/cgroup/dmem.o:(dmem_cgroup_uncharge) in archive vmlinux.a
   >>> referenced by dmem.c:766 (kernel/cgroup/dmem.c:766)
   >>>               kernel/cgroup/dmem.o:(dmem_cgroup_try_charge) in archive vmlinux.a
--
>> ld.lld: error: undefined symbol: mem_cgroup_dmem_charge
   >>> referenced by dmem.c:737 (kernel/cgroup/dmem.c:737)
   >>>               kernel/cgroup/dmem.o:(dmem_cgroup_try_charge) in archive vmlinux.a

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