linux-kernel - Re: [PATCH v2 1/2] mm/vmscan: respect mems_effective in demote_folio

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Message-ID: <202512230553.LuiUveL3-lkp@intel.com>
Date: Tue, 23 Dec 2025 05:56:20 +0800
From: kernel test robot <lkp@...el.com>
To: Bing Jiao <bingjiao@...gle.com>, linux-mm@...ck.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	akpm@...ux-foundation.org, gourry@...rry.net, longman@...hat.com,
	hannes@...xchg.org, mhocko@...nel.org, roman.gushchin@...ux.dev,
	shakeel.butt@...ux.dev, muchun.song@...ux.dev, tj@...nel.org,
	mkoutny@...e.com, david@...nel.org, zhengqi.arch@...edance.com,
	lorenzo.stoakes@...cle.com, axelrasmussen@...gle.com,
	yuanchu@...gle.com, weixugc@...gle.com, cgroups@...r.kernel.org,
	Bing Jiao <bingjiao@...gle.com>
Subject: Re: [PATCH v2 1/2] mm/vmscan: respect mems_effective in
 demote_folio_list()

Hi Bing,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on tj-cgroup/for-next linus/master v6.19-rc2 next-20251219]
[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/Bing-Jiao/mm-vmscan-respect-mems_effective-in-demote_folio_list/20251222-074143
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20251221233635.3761887-2-bingjiao%40google.com
patch subject: [PATCH v2 1/2] mm/vmscan: respect mems_effective in demote_folio_list()
config: arm-allnoconfig (https://download.01.org/0day-ci/archive/20251223/202512230553.LuiUveL3-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 185f5fd5ce4c65116ca8cf6df467a682ef090499)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251223/202512230553.LuiUveL3-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/202512230553.LuiUveL3-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from kernel/sched/rq-offsets.c:5:
   In file included from kernel/sched/sched.h:61:
   In file included from include/linux/syscalls_api.h:1:
   In file included from include/linux/syscalls.h:96:
   In file included from include/trace/syscall.h:7:
   In file included from include/linux/trace_events.h:10:
   In file included from include/linux/perf_event.h:53:
   In file included from include/linux/security.h:35:
   In file included from include/linux/bpf.h:32:
>> include/linux/memcontrol.h:1824:1: warning: non-void function does not return a value [-Wreturn-type]
    1824 | }
         | ^
   1 warning generated.
--
   In file included from arch/arm/kernel/signal.c:12:
   In file included from include/linux/resume_user_mode.h:8:
>> include/linux/memcontrol.h:1824:1: warning: non-void function does not return a value [-Wreturn-type]
    1824 | }
         | ^
   arch/arm/kernel/signal.c:143:15: warning: variable 'aux' set but not used [-Wunused-but-set-variable]
     143 |         char __user *aux;
         |                      ^
   2 warnings generated.
--
   In file included from kernel/sched/rq-offsets.c:5:
   In file included from kernel/sched/sched.h:61:
   In file included from include/linux/syscalls_api.h:1:
   In file included from include/linux/syscalls.h:96:
   In file included from include/trace/syscall.h:7:
   In file included from include/linux/trace_events.h:10:
   In file included from include/linux/perf_event.h:53:
   In file included from include/linux/security.h:35:
   In file included from include/linux/bpf.h:32:
>> include/linux/memcontrol.h:1824:1: warning: non-void function does not return a value [-Wreturn-type]
    1824 | }
         | ^
   1 warning generated.


vim +1824 include/linux/memcontrol.h

  1820	
  1821	static inline bool mem_cgroup_filter_mems_allowed(struct mem_cgroup *memcg,
  1822							  nodemask_t *mask)
  1823	{
> 1824	}
  1825	

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