Re: [PATCH] mm/memcg: remove return value of mem_cgroup_scan_tasks()

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

Hi Peng,

kernel test robot noticed the following build errors:

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

url:    https://github.com/intel-lab-lkp/linux/commits/Peng-Zhang/mm-memcg-remove-return-value-of-mem_cgroup_scan_tasks/20230616-102145
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20230616021955.872413-1-zhangpeng362%40huawei.com
patch subject: [PATCH] mm/memcg: remove return value of mem_cgroup_scan_tasks()
config: x86_64-randconfig-r005-20230616 (https://download.01.org/0day-ci/archive/20230616/202306161306.9YKbncNT-lkp@intel.com/config)
compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project.git 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a)
reproduce (this is a W=1 build):
        mkdir -p ~/bin
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git remote add akpm-mm https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git
        git fetch akpm-mm mm-everything
        git checkout akpm-mm/mm-everything
        b4 shazam https://lore.kernel.org/r/20230616021955.872413-1-zhangpeng362@huawei.com
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=x86_64 prepare

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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306161306.9YKbncNT-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/x86/kernel/asm-offsets.c:14:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
>> include/linux/memcontrol.h:1370:2: error: void function 'mem_cgroup_scan_tasks' should not return a value [-Wreturn-type]
           return 0;
           ^      ~
   1 error generated.
   make[2]: *** [scripts/Makefile.build:114: arch/x86/kernel/asm-offsets.s] Error 1 shuffle=3878817758
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:1287: prepare0] Error 2 shuffle=3878817758
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:226: __sub-make] Error 2 shuffle=3878817758
   make: Target 'prepare' not remade because of errors.


vim +/mem_cgroup_scan_tasks +1370 include/linux/memcontrol.h

5660048ccac873 Johannes Weiner  2012-01-12  1366  
5044a2e0ddbf82 ZhangPeng        2023-06-16  1367  static inline void mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
7c5f64f84483bd Vladimir Davydov 2016-10-07  1368  		int (*fn)(struct task_struct *, void *), void *arg)
7c5f64f84483bd Vladimir Davydov 2016-10-07  1369  {
7c5f64f84483bd Vladimir Davydov 2016-10-07 @1370  	return 0;
7c5f64f84483bd Vladimir Davydov 2016-10-07  1371  }
7c5f64f84483bd Vladimir Davydov 2016-10-07  1372  

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