Re: [PATCH] mm: memcontrol: add the mempolicy interface for cgroup v2.

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

Hi hezhongkun,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.18 next-20220524]
[cannot apply to akpm-mm/mm-everything]
[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]

url:    https://github.com/intel-lab-lkp/linux/commits/hezhongkun/mm-memcontrol-add-the-mempolicy-interface-for-cgroup-v2/20220524-183922
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 143a6252e1b8ab424b4b293512a97cca7295c182
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20220524/202205242108.pqUxw2OF-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-1) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/6adb0a02c27c8811bee9783451ee25155baf490e
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review hezhongkun/mm-memcontrol-add-the-mempolicy-interface-for-cgroup-v2/20220524-183922
        git checkout 6adb0a02c27c8811bee9783451ee25155baf490e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 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/mempolicy.c:179:19: warning: no previous prototype for 'get_cgrp_or_task_policy' [-Wmissing-prototypes]
     179 | struct mempolicy *get_cgrp_or_task_policy(struct task_struct *p)
         |                   ^~~~~~~~~~~~~~~~~~~~~~~
   mm/mempolicy.c: In function 'get_cgrp_or_task_policy':
>> mm/mempolicy.c:182:36: error: implicit declaration of function 'mem_cgroup_from_task'; did you mean 'perf_cgroup_from_task'? [-Werror=implicit-function-declaration]
     182 |         struct mem_cgroup *memcg = mem_cgroup_from_task(p);
         |                                    ^~~~~~~~~~~~~~~~~~~~
         |                                    perf_cgroup_from_task
>> mm/mempolicy.c:182:36: warning: initialization of 'struct mem_cgroup *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
>> mm/mempolicy.c:184:30: error: invalid use of undefined type 'struct mem_cgroup'
     184 |         pol = (memcg && memcg->mempolicy) ? memcg->mempolicy : get_task_policy(p);
         |                              ^~
   mm/mempolicy.c:184:50: error: invalid use of undefined type 'struct mem_cgroup'
     184 |         pol = (memcg && memcg->mempolicy) ? memcg->mempolicy : get_task_policy(p);
         |                                                  ^~
   mm/mempolicy.c: In function 'get_cgrp_or_vma_policy':
   mm/mempolicy.c:1799:36: warning: initialization of 'struct mem_cgroup *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
    1799 |         struct mem_cgroup *memcg = mem_cgroup_from_task(current);
         |                                    ^~~~~~~~~~~~~~~~~~~~
   mm/mempolicy.c:1801:30: error: invalid use of undefined type 'struct mem_cgroup'
    1801 |         pol = (memcg && memcg->mempolicy) ? memcg->mempolicy : get_vma_policy(vma, addr);
         |                              ^~
   mm/mempolicy.c:1801:50: error: invalid use of undefined type 'struct mem_cgroup'
    1801 |         pol = (memcg && memcg->mempolicy) ? memcg->mempolicy : get_vma_policy(vma, addr);
         |                                                  ^~
   cc1: some warnings being treated as errors


vim +182 mm/mempolicy.c

   178	
 > 179	struct mempolicy *get_cgrp_or_task_policy(struct task_struct *p)
   180	{
   181		struct mempolicy *pol;
 > 182		struct mem_cgroup *memcg = mem_cgroup_from_task(p);
   183	
 > 184		pol = (memcg && memcg->mempolicy) ? memcg->mempolicy : get_task_policy(p);
   185		return pol;
   186	}
   187	

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