linux-kernel - arch/powerpc/boot/decompress.c:133: undefined reference to `_

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Date:   Sun, 21 Jun 2020 11:36:10 +0800
From:   kernel test robot <lkp@...el.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: arch/powerpc/boot/decompress.c:133: undefined reference to
 `__decompress'

Hi Masahiro,

It's probably a bug fix that unveils the link errors.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8b6ddd10d678bebec32381f71b6b420bafc43ad0
commit: 67bf47452ea00edd90e796054229b651e64b82c1 kbuild: update compile-test header list for v5.3-rc1
date:   11 months ago
config: powerpc64-randconfig-c021-20200619 (attached as .config)
compiler: powerpc-linux-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.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:133: undefined reference to `__decompress'

vim +133 arch/powerpc/boot/decompress.c

1b7898ee276b39 Oliver O'Halloran 2016-09-22   98  
1b7898ee276b39 Oliver O'Halloran 2016-09-22   99  /**
1b7898ee276b39 Oliver O'Halloran 2016-09-22  100   * partial_decompress - decompresses part or all of a compressed buffer
1b7898ee276b39 Oliver O'Halloran 2016-09-22  101   * @inbuf:       input buffer
1b7898ee276b39 Oliver O'Halloran 2016-09-22  102   * @input_size:  length of the input buffer
1b7898ee276b39 Oliver O'Halloran 2016-09-22  103   * @outbuf:      input buffer
1b7898ee276b39 Oliver O'Halloran 2016-09-22  104   * @output_size: length of the input buffer
1b7898ee276b39 Oliver O'Halloran 2016-09-22  105   * @skip         number of output bytes to ignore
1b7898ee276b39 Oliver O'Halloran 2016-09-22  106   *
1b7898ee276b39 Oliver O'Halloran 2016-09-22  107   * This function takes compressed data from inbuf, decompresses and write it to
1b7898ee276b39 Oliver O'Halloran 2016-09-22  108   * outbuf. Once output_size bytes are written to the output buffer, or the
1b7898ee276b39 Oliver O'Halloran 2016-09-22  109   * stream is exhausted the function will return the number of bytes that were
1b7898ee276b39 Oliver O'Halloran 2016-09-22  110   * decompressed. Otherwise it will return whatever error code the decompressor
1b7898ee276b39 Oliver O'Halloran 2016-09-22  111   * reported (NB: This is specific to each decompressor type).
1b7898ee276b39 Oliver O'Halloran 2016-09-22  112   *
1b7898ee276b39 Oliver O'Halloran 2016-09-22  113   * The skip functionality is mainly there so the program and discover
1b7898ee276b39 Oliver O'Halloran 2016-09-22  114   * the size of the compressed image so that it can ask firmware (if present)
1b7898ee276b39 Oliver O'Halloran 2016-09-22  115   * for an appropriately sized buffer.
1b7898ee276b39 Oliver O'Halloran 2016-09-22  116   */
1b7898ee276b39 Oliver O'Halloran 2016-09-22  117  long partial_decompress(void *inbuf, unsigned long input_size,
1b7898ee276b39 Oliver O'Halloran 2016-09-22  118  	void *outbuf, unsigned long output_size, unsigned long _skip)
1b7898ee276b39 Oliver O'Halloran 2016-09-22  119  {
1b7898ee276b39 Oliver O'Halloran 2016-09-22  120  	int ret;
1b7898ee276b39 Oliver O'Halloran 2016-09-22  121  
1b7898ee276b39 Oliver O'Halloran 2016-09-22  122  	/*
1b7898ee276b39 Oliver O'Halloran 2016-09-22  123  	 * The skipped bytes needs to be included in the size of data we want
1b7898ee276b39 Oliver O'Halloran 2016-09-22  124  	 * to decompress.
1b7898ee276b39 Oliver O'Halloran 2016-09-22  125  	 */
1b7898ee276b39 Oliver O'Halloran 2016-09-22  126  	output_size += _skip;
1b7898ee276b39 Oliver O'Halloran 2016-09-22  127  
1b7898ee276b39 Oliver O'Halloran 2016-09-22  128  	decompressed_bytes = 0;
1b7898ee276b39 Oliver O'Halloran 2016-09-22  129  	output_buffer = outbuf;
1b7898ee276b39 Oliver O'Halloran 2016-09-22  130  	limit = output_size;
1b7898ee276b39 Oliver O'Halloran 2016-09-22  131  	skip = _skip;
1b7898ee276b39 Oliver O'Halloran 2016-09-22  132  
1b7898ee276b39 Oliver O'Halloran 2016-09-22 @133  	ret = __decompress(inbuf, input_size, NULL, flush, outbuf,

:::::: The code at line 133 was first introduced by commit
:::::: 1b7898ee276b39e54d870dc4ef3374f663d0b426 powerpc/boot: Use the pre-boot decompression API

:::::: TO: Oliver O'Halloran <oohall@...il.com>
:::::: CC: Michael Ellerman <mpe@...erman.id.au>

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