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

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Message-ID: <202512230655.QvO6dmjt-lkp@intel.com>
Date: Tue, 23 Dec 2025 06:18:50 +0800
From: kernel test robot <lkp@...el.com>
To: Bing Jiao <bingjiao@...gle.com>, linux-mm@...ck.org
Cc: 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: alpha-allnoconfig (https://download.01.org/0day-ci/archive/20251223/202512230655.QvO6dmjt-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251223/202512230655.QvO6dmjt-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/202512230655.QvO6dmjt-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/bpf.h:32,
                    from include/linux/security.h:35,
                    from include/linux/perf_event.h:53,
                    from include/linux/trace_events.h:10,
                    from include/trace/syscall.h:7,
                    from include/linux/syscalls.h:96,
                    from include/linux/syscalls_api.h:1,
                    from kernel/sched/sched.h:61,
                    from kernel/sched/rq-offsets.c:5:
   include/linux/memcontrol.h: In function 'mem_cgroup_filter_mems_allowed':
>> include/linux/memcontrol.h:1824:1: warning: no return statement in function returning non-void [-Wreturn-type]
    1824 | }
         | ^
--
   In file included from include/linux/bpf.h:32,
                    from include/linux/security.h:35,
                    from include/linux/perf_event.h:53,
                    from include/linux/trace_events.h:10,
                    from include/trace/syscall.h:7,
                    from include/linux/syscalls.h:96,
                    from include/linux/syscalls_api.h:1,
                    from kernel/sched/sched.h:61,
                    from kernel/sched/rq-offsets.c:5:
   include/linux/memcontrol.h: In function 'mem_cgroup_filter_mems_allowed':
>> include/linux/memcontrol.h:1824:1: warning: no return statement in function returning non-void [-Wreturn-type]
    1824 | }
         | ^


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