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Subjectarch/powerpc/boot/decompress.c:137: undefined reference to `__decompress'
Hi Christophe,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: cd77006e01b3198c75fb7819b3d0ff89709539bb
commit: 264bffad4d08f967ab3d6690bb15757a526b186a powerpc/boot: Add lzo support for uImage
date: 12 months ago
config: powerpc-randconfig-r014-20200701 (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 264bffad4d08f967ab3d6690bb15757a526b186a
# 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: kernel test robot <lkp@intel.com>

All errors (new 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'

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@gmail.com>
:::::: CC: Michael Ellerman <mpe@ellerman.id.au>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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