Re: [RFC PATCH V1 3/5] mm/damon: Add 'damon_region' NUMA access statistics core implementation

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

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-statistics-function-support/20220216-163243
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-lkp@intel.com/config)
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/f84003da496b71b9f13c4de140de21d70a73a408
        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@intel.com>

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)
                                     ^
>> mm/damon/core.c:1023:24: warning: incompatible integer to pointer conversion initializing 'struct task_struct *' with an expression of type 'int' [-Wint-conversion]
                           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]) {
> 1023				struct task_struct *ts = damon_get_task_struct(t);
  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
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