Hi Mina,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Mina-Almasry/mm-Fix-memcg-reclaim-on-memory-tiered-systems/20221206-103512
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20221206023406.3182800-1-almasrymina%40google.com
patch subject: [PATCH v3] [mm-unstable] mm: Fix memcg reclaim on memory tiered systems
config: arm-randconfig-r036-20221206
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 6e4cea55f0d1104408b26ac574566a0e4de48036)
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
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/intel-lab-lkp/linux/commit/d326a3b857c743d1e64b73a752505a65732b4e51
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Mina-Almasry/mm-Fix-memcg-reclaim-on-memory-tiered-systems/20221206-103512
        git checkout d326a3b857c743d1e64b73a752505a65732b4e51
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> mm/vmscan.c:1599:6: warning: no previous prototype for function 'free_demote_page' [-Wmissing-prototypes]
   void free_demote_page(struct page *page, unsigned long private)
        ^
   mm/vmscan.c:1599:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void free_demote_page(struct page *page, unsigned long private)
   ^
   static 
   1 warning generated.


vim +/free_demote_page +1599 mm/vmscan.c

  1598	
> 1599	void free_demote_page(struct page *page, unsigned long private)
  1600	{
  1601		struct demotion_control *dc = (struct demotion_control *)private;
  1602	
  1603		if (dc->demote_from_nodemask &&
  1604		    !node_isset(page_to_nid(page), *dc->demote_from_nodemask))
  1605			dc->nr_demoted_outside_nodemask--;
  1606	
  1607		folio_put(page_folio(page));
  1608	}
  1609	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp