[staging:staging-testing 95/109] drivers/staging/erofs/unzip_vle_lz4.c:18: undefined reference to `LZ4_decompress_safe_partial'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git 
staging-testing
head:   4073536c927421a8908490cf22ce912cb97d7f53
commit: 05f9d4a0c8c439102fb30ff5da53748e807da585 [95/109] staging: erofs: use 
the new LZ4_decompress_safe_partial()
config: i386-randconfig-sb0-11092119 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout 05f9d4a0c8c439102fb30ff5da53748e807da585
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/staging/erofs/unzip_vle_lz4.o: In function `z_erofs_unzip_lz4':
>> drivers/staging/erofs/unzip_vle_lz4.c:18: undefined reference to 
>> `LZ4_decompress_safe_partial'

vim +18 drivers/staging/erofs/unzip_vle_lz4.c

    15  
    16  int z_erofs_unzip_lz4(void *in, void *out, size_t inlen, size_t outlen)
    17  {
  > 18          int ret = LZ4_decompress_safe_partial(in, out, inlen, outlen, 
outlen);
    19  
    20          if (ret >= 0)
    21                  return ret;
    22  
    23          /*
    24           * LZ4_decompress_safe_partial will return an error code
    25           * (< 0) if decompression failed
    26           */
    27          errln("%s, failed to decompress, in[%p, %zu] outlen[%p, %zu]",
    28                __func__, in, inlen, out, outlen);
    29          WARN_ON(1);
    30          print_hex_dump(KERN_DEBUG, "raw data [in]: ", 
DUMP_PREFIX_OFFSET,
    31                         16, 1, in, inlen, true);
    32          print_hex_dump(KERN_DEBUG, "raw data [out]: ", 
DUMP_PREFIX_OFFSET,
    33                         16, 1, out, outlen, true);
    34          return -EIO;
    35  }
    36  

---
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.config.gz
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