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* arch/arm/boot/compressed/../../../../lib/lz4/lz4_decompress.c:480:5: warning: no previous prototype for function 'LZ4_decompress_safe_withPrefix64k'
@ 2020-10-02 12:39 kernel test robot
  0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2020-10-02 12:39 UTC (permalink / raw)
  To: Nick Desaulniers
  Cc: kbuild-all, clang-built-linux, linux-kernel, Andrew Morton,
	Linux Memory Management List

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Hi Nick,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   472e5b056f000a778abb41f1e443de58eb259783
commit: 1e1b6d63d6340764e00356873e5794225a2a03ea lib/string.c: implement stpcpy
date:   6 days ago
config: arm-randconfig-r031-20201002 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project bcd05599d0e53977a963799d6ee4f6e0bc21331b)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1e1b6d63d6340764e00356873e5794225a2a03ea
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 1e1b6d63d6340764e00356873e5794225a2a03ea
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 

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 >>):

   In file included from arch/arm/boot/compressed/decompress.c:56:
   In file included from arch/arm/boot/compressed/../../../../lib/decompress_unlz4.c:10:
>> arch/arm/boot/compressed/../../../../lib/lz4/lz4_decompress.c:480:5: warning: no previous prototype for function 'LZ4_decompress_safe_withPrefix64k' [-Wmissing-prototypes]
   int LZ4_decompress_safe_withPrefix64k(const char *source, char *dest,
       ^
   arch/arm/boot/compressed/../../../../lib/lz4/lz4_decompress.c:480:1: 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/arm/boot/compressed/../../../../lib/lz4/lz4_decompress.c:502:5: warning: no previous prototype for function 'LZ4_decompress_safe_forceExtDict' [-Wmissing-prototypes]
   int LZ4_decompress_safe_forceExtDict(const char *source, char *dest,
       ^
   arch/arm/boot/compressed/../../../../lib/lz4/lz4_decompress.c:502:1: 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/arm/boot/compressed/decompress.c:59:5: warning: no previous prototype for function 'do_decompress' [-Wmissing-prototypes]
   int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x))
       ^
   arch/arm/boot/compressed/decompress.c:59:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x))
   ^
   static 
   3 warnings generated.

vim +/LZ4_decompress_safe_withPrefix64k +480 arch/arm/boot/compressed/../../../../lib/lz4/lz4_decompress.c

2209fda323e2fd2 Gao Xiang    2018-10-30  479  
2209fda323e2fd2 Gao Xiang    2018-10-30 @480  int LZ4_decompress_safe_withPrefix64k(const char *source, char *dest,
2209fda323e2fd2 Gao Xiang    2018-10-30  481  				      int compressedSize, int maxOutputSize)
2209fda323e2fd2 Gao Xiang    2018-10-30  482  {
2209fda323e2fd2 Gao Xiang    2018-10-30  483  	return LZ4_decompress_generic(source, dest,
2209fda323e2fd2 Gao Xiang    2018-10-30  484  				      compressedSize, maxOutputSize,
2209fda323e2fd2 Gao Xiang    2018-10-30  485  				      endOnInputSize, decode_full_block,
2209fda323e2fd2 Gao Xiang    2018-10-30  486  				      withPrefix64k,
2209fda323e2fd2 Gao Xiang    2018-10-30  487  				      (BYTE *)dest - 64 * KB, NULL, 0);
2209fda323e2fd2 Gao Xiang    2018-10-30  488  }
2209fda323e2fd2 Gao Xiang    2018-10-30  489  
2209fda323e2fd2 Gao Xiang    2018-10-30  490  static int LZ4_decompress_safe_withSmallPrefix(const char *source, char *dest,
2209fda323e2fd2 Gao Xiang    2018-10-30  491  					       int compressedSize,
2209fda323e2fd2 Gao Xiang    2018-10-30  492  					       int maxOutputSize,
2209fda323e2fd2 Gao Xiang    2018-10-30  493  					       size_t prefixSize)
2209fda323e2fd2 Gao Xiang    2018-10-30  494  {
2209fda323e2fd2 Gao Xiang    2018-10-30  495  	return LZ4_decompress_generic(source, dest,
2209fda323e2fd2 Gao Xiang    2018-10-30  496  				      compressedSize, maxOutputSize,
2209fda323e2fd2 Gao Xiang    2018-10-30  497  				      endOnInputSize, decode_full_block,
2209fda323e2fd2 Gao Xiang    2018-10-30  498  				      noDict,
2209fda323e2fd2 Gao Xiang    2018-10-30  499  				      (BYTE *)dest - prefixSize, NULL, 0);
4e1a33b105ddf20 Sven Schmidt 2017-02-24  500  }
cffb78b0e0b3a30 Kyungsik Lee 2013-07-08  501  
2209fda323e2fd2 Gao Xiang    2018-10-30 @502  int LZ4_decompress_safe_forceExtDict(const char *source, char *dest,
2209fda323e2fd2 Gao Xiang    2018-10-30  503  				     int compressedSize, int maxOutputSize,
2209fda323e2fd2 Gao Xiang    2018-10-30  504  				     const void *dictStart, size_t dictSize)
2209fda323e2fd2 Gao Xiang    2018-10-30  505  {
2209fda323e2fd2 Gao Xiang    2018-10-30  506  	return LZ4_decompress_generic(source, dest,
2209fda323e2fd2 Gao Xiang    2018-10-30  507  				      compressedSize, maxOutputSize,
2209fda323e2fd2 Gao Xiang    2018-10-30  508  				      endOnInputSize, decode_full_block,
2209fda323e2fd2 Gao Xiang    2018-10-30  509  				      usingExtDict, (BYTE *)dest,
2209fda323e2fd2 Gao Xiang    2018-10-30  510  				      (const BYTE *)dictStart, dictSize);
2209fda323e2fd2 Gao Xiang    2018-10-30  511  }
2209fda323e2fd2 Gao Xiang    2018-10-30  512  

:::::: The code at line 480 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>

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

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