linux-kernel - Re: [PATCH v2 4/5] memcg: add per-memcg ksm

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Message-ID: <202509142046.QatEaTQV-lkp@intel.com>
Date: Sun, 14 Sep 2025 21:02:38 +0800
From: kernel test robot <lkp@...el.com>
To: xu.xin16@....com.cn, akpm@...ux-foundation.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	shakeel.butt@...ux.dev, hannes@...xchg.org, mhocko@...nel.org,
	roman.gushchin@...ux.dev, david@...hat.com,
	chengming.zhou@...ux.dev, muchun.song@...ux.dev,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	cgroups@...r.kernel.org, xu.xin16@....com.cn
Subject: Re: [PATCH v2 4/5] memcg: add per-memcg ksm_profit

Hi,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on tj-cgroup/for-next linus/master v6.17-rc5 next-20250912]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/xu-xin16-zte-com-cn/memcg-add-per-memcg-ksm_rmap_items-stat/20250914-181132
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20250914180750448qMRz3iTon78DoExPyZusD%40zte.com.cn
patch subject: [PATCH v2 4/5] memcg: add per-memcg ksm_profit
config: um-randconfig-001-20250914 (https://download.01.org/0day-ci/archive/20250914/202509142046.QatEaTQV-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 21857ae337e0892a5522b6e7337899caa61de2a6)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250914/202509142046.QatEaTQV-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202509142046.QatEaTQV-lkp@intel.com/

All errors (new ones prefixed by >>):

   /usr/bin/ld: warning: .tmp_vmlinux1 has a LOAD segment with RWX permissions
   /usr/bin/ld: mm/ksm.o: in function `evaluate_memcg_ksm_stat':
>> mm/ksm.c:3335:(.ltext+0x163d): undefined reference to `ksm_process_profit'
   clang: error: linker command failed with exit code 1 (use -v to see invocation)


vim +3335 mm/ksm.c

  3324	
  3325	static int evaluate_memcg_ksm_stat(struct task_struct *task, void *arg)
  3326	{
  3327		struct mm_struct *mm;
  3328		struct memcg_ksm_stat *ksm_stat = arg;
  3329	
  3330		mm = get_task_mm(task);
  3331		if (mm) {
  3332			ksm_stat->ksm_rmap_items += mm->ksm_rmap_items;
  3333			ksm_stat->ksm_zero_pages += mm_ksm_zero_pages(mm);
  3334			ksm_stat->ksm_merging_pages += mm->ksm_merging_pages;
> 3335			ksm_stat->ksm_profit += ksm_process_profit(mm);
  3336			mmput(mm);
  3337		}
  3338	
  3339		return 0;
  3340	}
  3341	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki