[ast-bpf:memalloc 1/7] kernel/bpf/memalloc.c:158:10: error: call to undeclared function 'get_mem_cgroup_from_objcg'; ISO C99 and later do not support implicit function declarations

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/ast/bpf.git memalloc
head:   02e9f2eaae15bfdbc6ab59716ec63c471daa8822
commit: a4e9a79dc137aa2436d0217a0ac415e884cfa862 [1/7] bpf: Introduce any context BPF specific memory allocator.
config: hexagon-randconfig-r006-20220714 (https://download.01.org/0day-ci/archive/20220715/202207150914.NwhVRROz-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 2da550140aa98cf6a3e96417c87f1e89e3a26047)
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://git.kernel.org/pub/scm/linux/kernel/git/ast/bpf.git/commit/?id=a4e9a79dc137aa2436d0217a0ac415e884cfa862
        git remote add ast-bpf https://git.kernel.org/pub/scm/linux/kernel/git/ast/bpf.git
        git fetch --no-tags ast-bpf memalloc
        git checkout a4e9a79dc137aa2436d0217a0ac415e884cfa862
        # 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 kernel/bpf/

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

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

>> kernel/bpf/memalloc.c:158:10: error: call to undeclared function 'get_mem_cgroup_from_objcg'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                   return get_mem_cgroup_from_objcg(c->objcg);
                          ^
   kernel/bpf/memalloc.c:158:10: note: did you mean 'get_mem_cgroup_from_mm'?
   include/linux/memcontrol.h:1271:34: note: 'get_mem_cgroup_from_mm' declared here
   static inline struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm)
                                    ^
>> kernel/bpf/memalloc.c:158:10: warning: incompatible integer to pointer conversion returning 'int' from a function with result type 'struct mem_cgroup *' [-Wint-conversion]
                   return get_mem_cgroup_from_objcg(c->objcg);
                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   1 warning and 1 error generated.


vim +/get_mem_cgroup_from_objcg +158 kernel/bpf/memalloc.c

   154	
   155	static struct mem_cgroup *get_memcg(const struct bpf_mem_cache *c)
   156	{
   157		if (c->objcg)
 > 158			return get_mem_cgroup_from_objcg(c->objcg);
   159	

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