Hi Xin, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on linus/master] [also build test WARNING on v5.17-rc4] [cannot apply to hnaz-mm/master rostedt-trace/for-next next-20220216] [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] url: https://github.com/0day-ci/linux/commits/Xin-Hao/mm-damon-Add-NUMA-access... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git c5d9ae265b105d9a67575fb67bd4650a6fc08e25 config: hexagon-randconfig-r045-20220216 (https://download.01.org/0day-ci/archive/20220216/202202162010.gxDXd2ex-lk...) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0e628a783b935c70c80815db6c061ec84f884af5) 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 # https://github.com/0day-ci/linux/commit/f84003da496b71b9f13c4de140de21d70... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Xin-Hao/mm-damon-Add-NUMA-access-statistics-function-support/20220216-163243 git checkout f84003da496b71b9f13c4de140de21d70a73a408 # 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=hexagon SHELL=/bin/bash mm/damon/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): mm/damon/core.c:1023:29: error: implicit declaration of function 'damon_get_task_struct' [-Werror,-Wimplicit-function-declaration] struct task_struct *ts = damon_get_task_struct(t); ^ mm/damon/core.c:1023:29: note: did you mean 'get_task_struct'? include/linux/sched/task.h:104:35: note: 'get_task_struct' declared here static inline struct task_struct *get_task_struct(struct task_struct *t) ^ struct task_struct *ts = damon_get_task_struct(t); ^ ~~~~~~~~~~~~~~~~~~~~~~~~ mm/damon/core.c:1058:6: error: redefinition of 'damon_numa_fault' void damon_numa_fault(int page_nid, int node_id, struct vm_fault *vmf) ^ include/linux/damon.h:525:20: note: previous definition is here static inline void damon_numa_fault(int page_nid, int node_id, struct vm_fault *vmf) { } ^ 1 warning and 2 errors generated. vim +1023 mm/damon/core.c 1009 1010 static struct damon_target *get_damon_target(struct task_struct *task) 1011 { 1012 int i; 1013 unsigned long id1, id2; 1014 struct damon_target *t; 1015 1016 rcu_read_lock(); 1017 for (i = 0; i < READ_ONCE(dbgfs_nr_ctxs); i++) { 1018 struct damon_ctx *ctx = rcu_dereference(dbgfs_ctxs[i]); 1019 1020 if (!ctx || !ctx->kdamond) 1021 continue; 1022 damon_for_each_target(t, dbgfs_ctxs[i]) { 1024 1025 if (ts) { 1026 id1 = (unsigned long)pid_vnr((struct pid *)t->id); 1027 id2 = (unsigned long)pid_vnr(get_task_pid(task, PIDTYPE_PID)); 1028 put_task_struct(ts); 1029 if (id1 == id2) 1030 return t; 1031 } 1032 } 1033 } 1034 rcu_read_unlock(); 1035 1036 return NULL; 1037 } 1038 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org