Hi "Toke,

I love your patch! Yet something to improve:

[auto build test ERROR on bpf-next/master]

url:    https://github.com/0day-ci/linux/commits/Toke-H-iland-J-rgensen/bpf-Support-injecting-chain-calls-into-BPF-programs-on-load/20191005-035650
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: i386-defconfig (attached as .config)
compiler: gcc-7 (Debian 7.4.0-13) 7.4.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

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

All errors (new ones prefixed by >>):

   kernel/bpf/core.c: In function '__bpf_prog_free':
>> kernel/bpf/core.c:266:4: error: implicit declaration of function 'bpf_map_area_free'; did you mean 'bpf_prog_free'? [-Werror=implicit-function-declaration]
       bpf_map_area_free(array);
       ^~~~~~~~~~~~~~~~~
       bpf_prog_free
   cc1: some warnings being treated as errors

vim +266 kernel/bpf/core.c

   253	
   254	void __bpf_prog_free(struct bpf_prog *fp)
   255	{
   256		if (fp->aux) {
   257			free_percpu(fp->aux->stats);
   258			if (fp->aux->chain_progs) {
   259				struct bpf_array *array = fp->aux->chain_progs;
   260				int i;
   261	
   262				for (i = 0; i < BPF_NUM_CHAIN_SLOTS; i++)
   263					if (array->ptrs[i])
   264						bpf_prog_put(array->ptrs[i]);
   265	
 > 266				bpf_map_area_free(array);
   267			}
   268			kfree(fp->aux);
   269		}
   270		vfree(fp);
   271	}
   272	

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