Hi Nanyong,

FYI, the error/warning still remains.

tree: https://gitee.com/openeuler/kernel.git OLK-5.10 head: 8dcdd5a432518f8f8deb6ab608551ecda71bda40 commit: 0f6fb3570be40b783d8c756d64297be1a8e3d2b3 [15345/30000] memcg: support ksm merge any mode per cgroup config: x86_64-buildonly-randconfig-003-20241029 (https://download.01.org/0day-ci/archive/20241029/202410290835.BHKldai7-lkp@i...) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241029/202410290835.BHKldai7-lkp@i...)

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/202410290835.BHKldai7-lkp@intel.com/

All errors (new ones prefixed by >>):

mm/memcontrol.c: In function 'memory_ksm_show':

...

mm/memcontrol.c:5402:40: error: implicit declaration of function 'ksm_process_profit' [-Werror=implicit-function-declaration]

5402 | ksm_process_profits += ksm_process_profit(mm); | ^~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors

vim +/ksm_process_profit +5402 mm/memcontrol.c

5379 5380 static int memory_ksm_show(struct seq_file *m, void *v) 5381 { 5382 unsigned long ksm_merging_pages = 0; 5383 unsigned long ksm_rmap_items = 0; 5384 long ksm_process_profits = 0; 5385 unsigned int tasks = 0; 5386 struct task_struct *task; 5387 struct mm_struct *mm; 5388 struct css_task_iter it; 5389 struct mem_cgroup *memcg = mem_cgroup_from_seq(m); 5390 5391 css_task_iter_start(&memcg->css, CSS_TASK_ITER_PROCS, &it); 5392 while ((task = css_task_iter_next(&it))) { 5393 mm = get_task_mm(task); 5394 if (!mm) 5395 continue; 5396 5397 if (test_bit(MMF_VM_MERGE_ANY, &mm->flags)) 5398 tasks++; 5399 5400 ksm_rmap_items += mm->ksm_rmap_items; 5401 ksm_merging_pages += mm->ksm_merging_pages;

5402 ksm_process_profits += ksm_process_profit(mm);

5403 mmput(mm); 5404 } 5405 css_task_iter_end(&it); 5406 5407 seq_printf(m, "merge any state: %d\n", READ_ONCE(memcg->ksm_merge_any)); 5408 seq_printf(m, "merge any tasks: %u\n", tasks); 5409 seq_printf(m, "ksm_rmap_items %lu\n", ksm_rmap_items); 5410 seq_printf(m, "ksm_merging_pages %lu\n", ksm_merging_pages); 5411 seq_printf(m, "ksm_process_profits %ld\n", ksm_process_profits); 5412 return 0; 5413 } 5414