Hi Daniel,

I love your patch! Perhaps something to improve:

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

url:    
https://github.com/0day-ci/linux/commits/Daniel-Borkmann/BPF-support-for-global-data/20190301-112203
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: x86_64-randconfig-x017-201908 (attached as .config)
compiler: gcc-8 (Debian 8.2.0-21) 8.2.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   kernel//bpf/arraymap.c: In function 'array_map_direct_value_offset':
>> kernel//bpf/arraymap.c:182:24: warning: initialization of 'long unsigned 
>> int' from 'char *' makes integer from pointer without a cast 
>> [-Wint-conversion]
     unsigned long base  = array->value;
                           ^~~~~

vim +182 kernel//bpf/arraymap.c

   176  
   177  static int array_map_direct_value_offset(const struct bpf_map *map, u64 
imm,
   178                                           u32 *off)
   179  {
   180          struct bpf_array *array = container_of(map, struct bpf_array, 
map);
   181          unsigned long range = map->value_size;
 > 182          unsigned long base  = array->value;
   183          unsigned long addr  = imm;
   184  
   185          if (map->max_entries != 1)
   186                  return -ENOENT;
   187          if (addr < base || addr >= base + range)
   188                  return -ENOENT;
   189  
   190          *off = addr - base;
   191          return 0;
   192  }
   193  

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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