Re: [PATCH v4 09/11] mm: memcontrol: use obj_cgroup APIs to charge the LRU pages

[kernel test robot <lkp@intel.com>]

Hi Muchun,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on 4b0986a3613c92f4ec1bdc7f60ec66fea135991f]

url:    https://github.com/intel-lab-lkp/linux/commits/Muchun-Song/Use-obj_cgroup-APIs-to-charge-the-LRU-pages/20220524-143056
base:   4b0986a3613c92f4ec1bdc7f60ec66fea135991f
config: arm64-buildonly-randconfig-r005-20220524 (https://download.01.org/0day-ci/archive/20220525/202205250202.1JanYiVZ-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 10c9ecce9f6096e18222a331c5e7d085bd813f75)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/bec0ae12106e0cf12dd4e0e21eb0754b99be0ba2
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Muchun-Song/Use-obj_cgroup-APIs-to-charge-the-LRU-pages/20220524-143056
        git checkout bec0ae12106e0cf12dd4e0e21eb0754b99be0ba2
        # 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=arm64 SHELL=/bin/bash

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

All error/warnings (new ones prefixed by >>):

>> mm/memcontrol.c:6826:10: error: call to undeclared function '__get_obj_cgroup_from_memcg'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           objcg = __get_obj_cgroup_from_memcg(memcg);
                   ^
>> mm/memcontrol.c:6826:8: warning: incompatible integer to pointer conversion assigning to 'struct obj_cgroup *' from 'int' [-Wint-conversion]
           objcg = __get_obj_cgroup_from_memcg(memcg);
                 ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   1 warning and 1 error generated.


vim +/__get_obj_cgroup_from_memcg +6826 mm/memcontrol.c

  6818	
  6819	static int charge_memcg(struct folio *folio, struct mem_cgroup *memcg,
  6820				gfp_t gfp)
  6821	{
  6822		struct obj_cgroup *objcg;
  6823		long nr_pages = folio_nr_pages(folio);
  6824		int ret = 0;
  6825	
> 6826		objcg = __get_obj_cgroup_from_memcg(memcg);
  6827		/* Do not account at the root objcg level. */
  6828		if (!obj_cgroup_is_root(objcg))
  6829			ret = try_charge(memcg, gfp, nr_pages);
  6830		if (ret)
  6831			goto out;
  6832	
  6833		obj_cgroup_get(objcg);
  6834		commit_charge(folio, objcg);
  6835	
  6836		local_irq_disable();
  6837		mem_cgroup_charge_statistics(memcg, nr_pages);
  6838		memcg_check_events(memcg, folio_nid(folio));
  6839		local_irq_enable();
  6840	out:
  6841		obj_cgroup_put(objcg);
  6842		return ret;
  6843	}
  6844	

-- 
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