Hi Michal,

[auto build test ERROR on next-20170125]
[cannot apply to linus/master linux/master nf-next/master v4.9-rc8 v4.9-rc7 v4.9-rc6 v4.10-rc5]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Michal-Hocko/net-bpf-use-kvzalloc-helper/20170126-221904
config: x86_64-randconfig-x014-201704 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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

   kernel/bpf/syscall.c: In function 'bpf_map_area_alloc':
>> kernel/bpf/syscall.c:61:9: error: implicit declaration of function 'kvzalloc' [-Werror=implicit-function-declaration]
     return kvzalloc(size, GFP_USER);
            ^~~~~~~~
>> kernel/bpf/syscall.c:61:9: warning: return makes pointer from integer without a cast [-Wint-conversion]
     return kvzalloc(size, GFP_USER);
            ^~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/kvzalloc +61 kernel/bpf/syscall.c

    55	{
    56		/*
    57		 * FIXME: we would really like to not trigger the OOM killer and rather
    58		 * fail instead. This is not supported right now. Please nag MM people
    59		 * if these OOM start bothering people.
    60		 */
  > 61		return kvzalloc(size, GFP_USER);
    62	}
    63	
    64	void bpf_map_area_free(void *area)

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