arch/powerpc/boot/decompress.c:137: undefined reference to `__decompress'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b85051e755b0e9d6dd8f17ef1da083851b83287d
commit: 1cc9a21b0bb36debdf96dbcc4b139d6639373018 powerpc/boot: Add lzma support for uImage
config: powerpc-randconfig-r012-20200520 (attached as .config)
compiler: powerpc-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 1cc9a21b0bb36debdf96dbcc4b139d6639373018
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>, old ones prefixed by <<):

powerpc-linux-ld: arch/powerpc/boot/wrapper.a(decompress.o): in function `partial_decompress':
>> arch/powerpc/boot/decompress.c:137: undefined reference to `__decompress'

# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1cc9a21b0bb36debdf96dbcc4b139d6639373018
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git remote update linus
git checkout 1cc9a21b0bb36debdf96dbcc4b139d6639373018
vim +137 arch/powerpc/boot/decompress.c

1b7898ee276b39 Oliver O'Halloran 2016-09-22  102  
1b7898ee276b39 Oliver O'Halloran 2016-09-22  103  /**
1b7898ee276b39 Oliver O'Halloran 2016-09-22  104   * partial_decompress - decompresses part or all of a compressed buffer
1b7898ee276b39 Oliver O'Halloran 2016-09-22  105   * @inbuf:       input buffer
1b7898ee276b39 Oliver O'Halloran 2016-09-22  106   * @input_size:  length of the input buffer
1b7898ee276b39 Oliver O'Halloran 2016-09-22  107   * @outbuf:      input buffer
1b7898ee276b39 Oliver O'Halloran 2016-09-22  108   * @output_size: length of the input buffer
1b7898ee276b39 Oliver O'Halloran 2016-09-22  109   * @skip         number of output bytes to ignore
1b7898ee276b39 Oliver O'Halloran 2016-09-22  110   *
1b7898ee276b39 Oliver O'Halloran 2016-09-22  111   * This function takes compressed data from inbuf, decompresses and write it to
1b7898ee276b39 Oliver O'Halloran 2016-09-22  112   * outbuf. Once output_size bytes are written to the output buffer, or the
1b7898ee276b39 Oliver O'Halloran 2016-09-22  113   * stream is exhausted the function will return the number of bytes that were
1b7898ee276b39 Oliver O'Halloran 2016-09-22  114   * decompressed. Otherwise it will return whatever error code the decompressor
1b7898ee276b39 Oliver O'Halloran 2016-09-22  115   * reported (NB: This is specific to each decompressor type).
1b7898ee276b39 Oliver O'Halloran 2016-09-22  116   *
1b7898ee276b39 Oliver O'Halloran 2016-09-22  117   * The skip functionality is mainly there so the program and discover
1b7898ee276b39 Oliver O'Halloran 2016-09-22  118   * the size of the compressed image so that it can ask firmware (if present)
1b7898ee276b39 Oliver O'Halloran 2016-09-22  119   * for an appropriately sized buffer.
1b7898ee276b39 Oliver O'Halloran 2016-09-22  120   */
1b7898ee276b39 Oliver O'Halloran 2016-09-22  121  long partial_decompress(void *inbuf, unsigned long input_size,
1b7898ee276b39 Oliver O'Halloran 2016-09-22  122  	void *outbuf, unsigned long output_size, unsigned long _skip)
1b7898ee276b39 Oliver O'Halloran 2016-09-22  123  {
1b7898ee276b39 Oliver O'Halloran 2016-09-22  124  	int ret;
1b7898ee276b39 Oliver O'Halloran 2016-09-22  125  
1b7898ee276b39 Oliver O'Halloran 2016-09-22  126  	/*
1b7898ee276b39 Oliver O'Halloran 2016-09-22  127  	 * The skipped bytes needs to be included in the size of data we want
1b7898ee276b39 Oliver O'Halloran 2016-09-22  128  	 * to decompress.
1b7898ee276b39 Oliver O'Halloran 2016-09-22  129  	 */
1b7898ee276b39 Oliver O'Halloran 2016-09-22  130  	output_size += _skip;
1b7898ee276b39 Oliver O'Halloran 2016-09-22  131  
1b7898ee276b39 Oliver O'Halloran 2016-09-22  132  	decompressed_bytes = 0;
1b7898ee276b39 Oliver O'Halloran 2016-09-22  133  	output_buffer = outbuf;
1b7898ee276b39 Oliver O'Halloran 2016-09-22  134  	limit = output_size;
1b7898ee276b39 Oliver O'Halloran 2016-09-22  135  	skip = _skip;
1b7898ee276b39 Oliver O'Halloran 2016-09-22  136  
1b7898ee276b39 Oliver O'Halloran 2016-09-22 @137  	ret = __decompress(inbuf, input_size, NULL, flush, outbuf,

:::::: The code at line 137 was first introduced by commit
:::::: 1b7898ee276b39e54d870dc4ef3374f663d0b426 powerpc/boot: Use the pre-boot decompression API

:::::: TO: Oliver O'Halloran <oohall@xxxxxxxxx>
:::::: CC: Michael Ellerman <mpe@xxxxxxxxxxxxxx>

---
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