[kbuild-all] mm/memcontrol.c:2774:20: error: unused function 'cancel_charge'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 754e0b0e35608ed5206d6a67a791563c631cec07 commit: 58056f77502f3567b760c9a8fc8d2e9081515b2d memcg, kmem: further deprecate kmem.limit_in_bytes date: 3 months ago config: arm-randconfig-r005-20220213 (https://download.01.org/0day-ci/archive/20220214/202202140629.MxlIbXOG-lk...) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project ea071884b0cc7210b3cc5fe858f0e892a779a23b) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 58056f77502f3567b760c9a8fc8d2e9081515b2d # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): static inline void cancel_charge(struct mem_cgroup *memcg, unsigned int nr_pages) ^ mm/memcontrol.c:3339:19: error: unused function 'mem_cgroup_move_swap_account' [-Werror,-Wunused-function] static inline int mem_cgroup_move_swap_account(swp_entry_t entry, ^ 2 errors generated. vim +/cancel_charge +2774 mm/memcontrol.c 2773 2775 { 2776 if (mem_cgroup_is_root(memcg)) 2777 return; 2778 2779 page_counter_uncharge(&memcg->memory, nr_pages); 2780 if (do_memsw_account()) 2781 page_counter_uncharge(&memcg->memsw, nr_pages); 2782 } 2783 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org