arch/mips/boot/compressed/../../../../lib/lz4/lz4_decompress.c:506:5: warning: no previous prototype for function 'LZ4_decompress_safe_forceExtDict'

arch/mips/boot/compressed/../../../../lib/lz4/lz4_decompress.c:506:5: warning: no previous prototype for function 'LZ4_decompress_safe_forceExtDict'

[kernel test robot]

Hi Krzysztof,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b2d229d4ddb17db541098b83524d901257e93845
commit: 84a0124a9d715d844675c8cfbe5bbc9147121f73 MIPS: ralink: define stubs for clk_set_parent to fix compile testing
date:   1 year, 1 month ago
config: mips-buildonly-randconfig-r002-20220418 (https://download.01.org/0day-ci/archive/20220419/202204190231.jAoAYNgP-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 429cbac0390654f90bba18a41799464adf31a5ec)
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
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=84a0124a9d715d844675c8cfbe5bbc9147121f73
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 84a0124a9d715d844675c8cfbe5bbc9147121f73
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

   arch/mips/boot/compressed/decompress.c:40:6: warning: no previous prototype for function 'error' [-Wmissing-prototypes]
   void error(char *x)
        ^
   arch/mips/boot/compressed/decompress.c:40:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void error(char *x)
   ^
   static 
   In file included from arch/mips/boot/compressed/decompress.c:62:
   In file included from arch/mips/boot/compressed/../../../../lib/decompress_unlz4.c:10:
   arch/mips/boot/compressed/../../../../lib/lz4/lz4_decompress.c:484:5: warning: no previous prototype for function 'LZ4_decompress_safe_withPrefix64k' [-Wmissing-prototypes]
   int LZ4_decompress_safe_withPrefix64k(const char *source, char *dest,
       ^
   arch/mips/boot/compressed/../../../../lib/lz4/lz4_decompress.c:484:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int LZ4_decompress_safe_withPrefix64k(const char *source, char *dest,
   ^
   static 
>> arch/mips/boot/compressed/../../../../lib/lz4/lz4_decompress.c:506:5: warning: no previous prototype for function 'LZ4_decompress_safe_forceExtDict' [-Wmissing-prototypes]
   int LZ4_decompress_safe_forceExtDict(const char *source, char *dest,
       ^
   arch/mips/boot/compressed/../../../../lib/lz4/lz4_decompress.c:506:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int LZ4_decompress_safe_forceExtDict(const char *source, char *dest,
   ^
   static 
   arch/mips/boot/compressed/decompress.c:83:6: warning: no previous prototype for function '__stack_chk_fail' [-Wmissing-prototypes]
   void __stack_chk_fail(void)
        ^
   arch/mips/boot/compressed/decompress.c:83:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __stack_chk_fail(void)
   ^
   static 
   arch/mips/boot/compressed/decompress.c:88:6: warning: no previous prototype for function 'decompress_kernel' [-Wmissing-prototypes]
   void decompress_kernel(unsigned long boot_heap_start)
        ^
   arch/mips/boot/compressed/decompress.c:88:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void decompress_kernel(unsigned long boot_heap_start)
   ^
   static 
   5 warnings generated.


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

2209fda323e2fd Gao Xiang    2018-10-30  483  
2209fda323e2fd Gao Xiang    2018-10-30 @484  int LZ4_decompress_safe_withPrefix64k(const char *source, char *dest,
2209fda323e2fd Gao Xiang    2018-10-30  485  				      int compressedSize, int maxOutputSize)
2209fda323e2fd Gao Xiang    2018-10-30  486  {
2209fda323e2fd Gao Xiang    2018-10-30  487  	return LZ4_decompress_generic(source, dest,
2209fda323e2fd Gao Xiang    2018-10-30  488  				      compressedSize, maxOutputSize,
2209fda323e2fd Gao Xiang    2018-10-30  489  				      endOnInputSize, decode_full_block,
2209fda323e2fd Gao Xiang    2018-10-30  490  				      withPrefix64k,
2209fda323e2fd Gao Xiang    2018-10-30  491  				      (BYTE *)dest - 64 * KB, NULL, 0);
2209fda323e2fd Gao Xiang    2018-10-30  492  }
2209fda323e2fd Gao Xiang    2018-10-30  493  
2209fda323e2fd Gao Xiang    2018-10-30  494  static int LZ4_decompress_safe_withSmallPrefix(const char *source, char *dest,
2209fda323e2fd Gao Xiang    2018-10-30  495  					       int compressedSize,
2209fda323e2fd Gao Xiang    2018-10-30  496  					       int maxOutputSize,
2209fda323e2fd Gao Xiang    2018-10-30  497  					       size_t prefixSize)
2209fda323e2fd Gao Xiang    2018-10-30  498  {
2209fda323e2fd Gao Xiang    2018-10-30  499  	return LZ4_decompress_generic(source, dest,
2209fda323e2fd Gao Xiang    2018-10-30  500  				      compressedSize, maxOutputSize,
2209fda323e2fd Gao Xiang    2018-10-30  501  				      endOnInputSize, decode_full_block,
2209fda323e2fd Gao Xiang    2018-10-30  502  				      noDict,
2209fda323e2fd Gao Xiang    2018-10-30  503  				      (BYTE *)dest - prefixSize, NULL, 0);
4e1a33b105ddf2 Sven Schmidt 2017-02-24  504  }
cffb78b0e0b3a3 Kyungsik Lee 2013-07-08  505  
2209fda323e2fd Gao Xiang    2018-10-30 @506  int LZ4_decompress_safe_forceExtDict(const char *source, char *dest,
2209fda323e2fd Gao Xiang    2018-10-30  507  				     int compressedSize, int maxOutputSize,
2209fda323e2fd Gao Xiang    2018-10-30  508  				     const void *dictStart, size_t dictSize)
2209fda323e2fd Gao Xiang    2018-10-30  509  {
2209fda323e2fd Gao Xiang    2018-10-30  510  	return LZ4_decompress_generic(source, dest,
2209fda323e2fd Gao Xiang    2018-10-30  511  				      compressedSize, maxOutputSize,
2209fda323e2fd Gao Xiang    2018-10-30  512  				      endOnInputSize, decode_full_block,
2209fda323e2fd Gao Xiang    2018-10-30  513  				      usingExtDict, (BYTE *)dest,
2209fda323e2fd Gao Xiang    2018-10-30  514  				      (const BYTE *)dictStart, dictSize);
2209fda323e2fd Gao Xiang    2018-10-30  515  }
2209fda323e2fd 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@huawei.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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