linux-kernel - arch/mips/boot/compressed/../../../../lib/lz4/lz4_decompress.c:506:5: warning: no previous prototype for 'LZ4_decompress_safe

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Date:   Thu, 11 Nov 2021 04:45:00 +0800
From:   kernel test robot <lkp@...el.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Matti Vaittinen <mazziesaccount@...il.com>
Subject: arch/mips/boot/compressed/../../../../lib/lz4/lz4_decompress.c:506:5:
 warning: no previous prototype for 'LZ4_decompress_safe_forceExtDict'

Hi Randy,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   89d714ab6043bca7356b5c823f5335f5dce1f930
commit: 5ba3747dbc9ade2d22a8f5bff3c928cb41d35030 regulator: bd71815: add select to fix build
date:   6 months ago
config: mips-randconfig-r015-20211012 (attached as .config)
compiler: mipsel-linux-gcc (GCC) 11.2.0
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5ba3747dbc9ade2d22a8f5bff3c928cb41d35030
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 5ba3747dbc9ade2d22a8f5bff3c928cb41d35030
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=mips 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   arch/mips/boot/compressed/decompress.c:40:6: warning: no previous prototype for 'error' [-Wmissing-prototypes]
      40 | void error(char *x)
         |      ^~~~~
   In file included from arch/mips/boot/compressed/../../../../lib/decompress_unlz4.c:10,
                    from arch/mips/boot/compressed/decompress.c:62:
   arch/mips/boot/compressed/../../../../lib/lz4/lz4_decompress.c:484:5: warning: no previous prototype for 'LZ4_decompress_safe_withPrefix64k' [-Wmissing-prototypes]
     484 | int LZ4_decompress_safe_withPrefix64k(const char *source, char *dest,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/mips/boot/compressed/../../../../lib/lz4/lz4_decompress.c:506:5: warning: no previous prototype for 'LZ4_decompress_safe_forceExtDict' [-Wmissing-prototypes]
     506 | int LZ4_decompress_safe_forceExtDict(const char *source, char *dest,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/mips/boot/compressed/decompress.c:83:6: warning: no previous prototype for '__stack_chk_fail' [-Wmissing-prototypes]
      83 | void __stack_chk_fail(void)
         |      ^~~~~~~~~~~~~~~~
   arch/mips/boot/compressed/decompress.c:88:6: warning: no previous prototype for 'decompress_kernel' [-Wmissing-prototypes]
      88 | void decompress_kernel(unsigned long boot_heap_start)
         |      ^~~~~~~~~~~~~~~~~


vim +/LZ4_decompress_safe_forceExtDict +506 arch/mips/boot/compressed/../../../../lib/lz4/lz4_decompress.c

cffb78b0e0b3a30 Kyungsik Lee 2013-07-08  505  
2209fda323e2fd2 Gao Xiang    2018-10-30 @506  int LZ4_decompress_safe_forceExtDict(const char *source, char *dest,
2209fda323e2fd2 Gao Xiang    2018-10-30  507  				     int compressedSize, int maxOutputSize,
2209fda323e2fd2 Gao Xiang    2018-10-30  508  				     const void *dictStart, size_t dictSize)
2209fda323e2fd2 Gao Xiang    2018-10-30  509  {
2209fda323e2fd2 Gao Xiang    2018-10-30  510  	return LZ4_decompress_generic(source, dest,
2209fda323e2fd2 Gao Xiang    2018-10-30  511  				      compressedSize, maxOutputSize,
2209fda323e2fd2 Gao Xiang    2018-10-30  512  				      endOnInputSize, decode_full_block,
2209fda323e2fd2 Gao Xiang    2018-10-30  513  				      usingExtDict, (BYTE *)dest,
2209fda323e2fd2 Gao Xiang    2018-10-30  514  				      (const BYTE *)dictStart, dictSize);
2209fda323e2fd2 Gao Xiang    2018-10-30  515  }
2209fda323e2fd2 Gao Xiang    2018-10-30  516  

:::::: The code at line 506 was first introduced by commit
:::::: 2209fda323e2fd2a2d0885595fd5097717f8d2aa lib/lz4: update LZ4 decompressor module

:::::: TO: Gao Xiang <gaoxiang25@...wei.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

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

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