[ammarfaizi2-block:tj/cgroup/for-6.1 4/6] mm/memcontrol.c:5114:10: error: incompatible integer to pointer conversion returning 'long' from a function with result type 'struct mem_cgroup *'

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

tree:   https://github.com/ammarfaizi2/linux-block tj/cgroup/for-6.1
head:   075b593f54f0f3883532cb750081cae6917bc8fe
commit: fa7e439cf90ba23ea473d0b7d85efd02ae6ccf94 [4/6] cgroup: Homogenize cgroup_get_from_id() return value
config: hexagon-randconfig-r041-20220827 (https://download.01.org/0day-ci/archive/20220827/202208271911.8wz6JKoa-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project a2100daf12fb980a29fd1a9c85ccf8eaaaf79730)
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
        # https://github.com/ammarfaizi2/linux-block/commit/fa7e439cf90ba23ea473d0b7d85efd02ae6ccf94
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block tj/cgroup/for-6.1
        git checkout fa7e439cf90ba23ea473d0b7d85efd02ae6ccf94
        # 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=hexagon SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

>> mm/memcontrol.c:5114:10: error: incompatible integer to pointer conversion returning 'long' from a function with result type 'struct mem_cgroup *' [-Wint-conversion]
                   return PTR_ERR(cgrp);
                          ^~~~~~~~~~~~~
   1 error generated.


vim +5114 mm/memcontrol.c

  5104	
  5105	#ifdef CONFIG_SHRINKER_DEBUG
  5106	struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino)
  5107	{
  5108		struct cgroup *cgrp;
  5109		struct cgroup_subsys_state *css;
  5110		struct mem_cgroup *memcg;
  5111	
  5112		cgrp = cgroup_get_from_id(ino);
  5113		if (IS_ERR(cgrp))
> 5114			return PTR_ERR(cgrp);
  5115	
  5116		css = cgroup_get_e_css(cgrp, &memory_cgrp_subsys);
  5117		if (css)
  5118			memcg = container_of(css, struct mem_cgroup, css);
  5119		else
  5120			memcg = ERR_PTR(-ENOENT);
  5121	
  5122		cgroup_put(cgrp);
  5123	
  5124		return memcg;
  5125	}
  5126	#endif
  5127	

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