tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   b9d3d01405061bb42358fe53f824e894a1922ced
commit: fc9702273e2edb90400a34b3be76f7b08fa3344b [11808/13503] bpf: Add mmap() support for BPF_MAP_TYPE_ARRAY
config: arm-randconfig-a001-20191123 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout fc9702273e2edb90400a34b3be76f7b08fa3344b
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=arm 

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

All errors (new ones prefixed by >>):

   arm-linux-gnueabi-ld: section .data VMA [0000000000808000,00000000008829bf] overlaps section .ARM.unwind_idx VMA [00000000007d7000,000000000080b8ef]
   arm-linux-gnueabi-ld: section .ARM.unwind_tab VMA [000000000080b8f0,000000000080febb] overlaps section .data VMA [0000000000808000,00000000008829bf]
   kernel/bpf/syscall.o: In function `__bpf_map_area_alloc':
>> kernel/bpf/syscall.c:154: undefined reference to `vmalloc_user_node_flags'

vim +154 kernel/bpf/syscall.c

   129	
   130	static void *__bpf_map_area_alloc(size_t size, int numa_node, bool mmapable)
   131	{
   132		/* We really just want to fail instead of triggering OOM killer
   133		 * under memory pressure, therefore we set __GFP_NORETRY to kmalloc,
   134		 * which is used for lower order allocation requests.
   135		 *
   136		 * It has been observed that higher order allocation requests done by
   137		 * vmalloc with __GFP_NORETRY being set might fail due to not trying
   138		 * to reclaim memory from the page cache, thus we set
   139		 * __GFP_RETRY_MAYFAIL to avoid such situations.
   140		 */
   141	
   142		const gfp_t flags = __GFP_NOWARN | __GFP_ZERO;
   143		void *area;
   144	
   145		/* kmalloc()'ed memory can't be mmap()'ed */
   146		if (!mmapable && size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) {
   147			area = kmalloc_node(size, GFP_USER | __GFP_NORETRY | flags,
   148					    numa_node);
   149			if (area != NULL)
   150				return area;
   151		}
   152		if (mmapable) {
   153			BUG_ON(!PAGE_ALIGNED(size));
 > 154			return vmalloc_user_node_flags(size, numa_node, GFP_KERNEL |
   155						       __GFP_RETRY_MAYFAIL | flags);
   156		}
   157		return __vmalloc_node_flags_caller(size, numa_node,
   158						   GFP_KERNEL | __GFP_RETRY_MAYFAIL |
   159						   flags, __builtin_return_address(0));
   160	}
   161	

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