Hi Sven,

[auto build test ERROR on linus/master]
[also build test ERROR on next-20161221]
[cannot apply to v4.9]
[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/Sven-Schmidt/Update-LZ4-compressor-module/20161221-130109
config: x86_64-randconfig-x006-201651 (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 

Note: the linux-review/Sven-Schmidt/Update-LZ4-compressor-module/20161221-130109 HEAD 08652114d6d8867d2e8b3545b5e9f8a2fe11a5d7 builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   fs/pstore/platform.c: In function 'compress_lz4':
>> fs/pstore/platform.c:345:8: error: implicit declaration of function 'LZ4_compress_default' [-Werror=implicit-function-declaration]
     ret = LZ4_compress_default(in, out, inlen, outlen, workspace);
           ^~~~~~~~~~~~~~~~~~~~
   fs/pstore/platform.c: In function 'decompress_lz4':
>> fs/pstore/platform.c:358:8: error: implicit declaration of function 'LZ4_decompress_safe' [-Werror=implicit-function-declaration]
     ret = LZ4_decompress_safe(in, out, inlen, outlen);
           ^~~~~~~~~~~~~~~~~~~
   fs/pstore/platform.c: In function 'allocate_lz4':
>> fs/pstore/platform.c:369:20: error: implicit declaration of function 'LZ4_compressBound' [-Werror=implicit-function-declaration]
     big_oops_buf_sz = LZ4_compressBound(psinfo->bufsize);
                       ^~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/LZ4_compress_default +345 fs/pstore/platform.c

   339	
   340	#ifdef CONFIG_PSTORE_LZ4_COMPRESS
   341	static int compress_lz4(const void *in, void *out, size_t inlen, size_t outlen)
   342	{
   343		int ret;
   344	
 > 345		ret = LZ4_compress_default(in, out, inlen, outlen, workspace);
   346		if (ret) {
   347			pr_err("lz4_compress error, ret = %d!\n", ret);
   348			return -EIO;
   349		}
   350	
   351		return outlen;
   352	}
   353	
   354	static int decompress_lz4(void *in, void *out, size_t inlen, size_t outlen)
   355	{
   356		int ret;
   357	
 > 358		ret = LZ4_decompress_safe(in, out, inlen, outlen);
   359		if (ret) {
   360			pr_err("lz4_decompress error, ret = %d!\n", ret);
   361			return -EIO;
   362		}
   363	
   364		return outlen;
   365	}
   366	
   367	static void allocate_lz4(void)
   368	{
 > 369		big_oops_buf_sz = LZ4_compressBound(psinfo->bufsize);
   370		big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
   371		if (big_oops_buf) {
   372			workspace = kmalloc(LZ4_MEM_COMPRESS, GFP_KERNEL);

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