arch/arm/boot/compressed/../../../../lib/lz4/lz4_decompress.c:480:5: warning: no previous prototype for 'LZ4_decompress_safe_withPrefix64k'

arch/arm/boot/compressed/../../../../lib/lz4/lz4_decompress.c:480:5: warning: no previous prototype for 'LZ4_decompress_safe_withPrefix64k'

[kernel test robot]

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Hi Arnd,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d434405aaab7d0ebc516b68a8fc4100922d7f5ef
commit: 45fe7befe0db5e61cd3c846315f0ac48541e8445 coresight: remove broken __exit annotations
date:   4 months ago
config: arm-randconfig-r001-20210412 (attached as .config)
compiler: arm-linux-gnueabi-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
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=45fe7befe0db5e61cd3c846315f0ac48541e8445
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 45fe7befe0db5e61cd3c846315f0ac48541e8445
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 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/../../../../lib/decompress_unlz4.c:10,
                    from arch/arm/boot/compressed/decompress.c:56:
>> arch/arm/boot/compressed/../../../../lib/lz4/lz4_decompress.c:480:5: warning: no previous prototype for 'LZ4_decompress_safe_withPrefix64k' [-Wmissing-prototypes]
     480 | int LZ4_decompress_safe_withPrefix64k(const char *source, char *dest,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/arm/boot/compressed/../../../../lib/lz4/lz4_decompress.c:502:5: warning: no previous prototype for 'LZ4_decompress_safe_forceExtDict' [-Wmissing-prototypes]
     502 | int LZ4_decompress_safe_forceExtDict(const char *source, char *dest,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm/boot/compressed/decompress.c:59:5: warning: no previous prototype for 'do_decompress' [-Wmissing-prototypes]
      59 | int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x))
         |     ^~~~~~~~~~~~~


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

2209fda323e2fd Gao Xiang    2018-10-30  479  
2209fda323e2fd Gao Xiang    2018-10-30 @480  int LZ4_decompress_safe_withPrefix64k(const char *source, char *dest,
2209fda323e2fd Gao Xiang    2018-10-30  481  				      int compressedSize, int maxOutputSize)
2209fda323e2fd Gao Xiang    2018-10-30  482  {
2209fda323e2fd Gao Xiang    2018-10-30  483  	return LZ4_decompress_generic(source, dest,
2209fda323e2fd Gao Xiang    2018-10-30  484  				      compressedSize, maxOutputSize,
2209fda323e2fd Gao Xiang    2018-10-30  485  				      endOnInputSize, decode_full_block,
2209fda323e2fd Gao Xiang    2018-10-30  486  				      withPrefix64k,
2209fda323e2fd Gao Xiang    2018-10-30  487  				      (BYTE *)dest - 64 * KB, NULL, 0);
2209fda323e2fd Gao Xiang    2018-10-30  488  }
2209fda323e2fd Gao Xiang    2018-10-30  489  
2209fda323e2fd Gao Xiang    2018-10-30  490  static int LZ4_decompress_safe_withSmallPrefix(const char *source, char *dest,
2209fda323e2fd Gao Xiang    2018-10-30  491  					       int compressedSize,
2209fda323e2fd Gao Xiang    2018-10-30  492  					       int maxOutputSize,
2209fda323e2fd Gao Xiang    2018-10-30  493  					       size_t prefixSize)
2209fda323e2fd Gao Xiang    2018-10-30  494  {
2209fda323e2fd Gao Xiang    2018-10-30  495  	return LZ4_decompress_generic(source, dest,
2209fda323e2fd Gao Xiang    2018-10-30  496  				      compressedSize, maxOutputSize,
2209fda323e2fd Gao Xiang    2018-10-30  497  				      endOnInputSize, decode_full_block,
2209fda323e2fd Gao Xiang    2018-10-30  498  				      noDict,
2209fda323e2fd Gao Xiang    2018-10-30  499  				      (BYTE *)dest - prefixSize, NULL, 0);
4e1a33b105ddf2 Sven Schmidt 2017-02-24  500  }
cffb78b0e0b3a3 Kyungsik Lee 2013-07-08  501  
2209fda323e2fd Gao Xiang    2018-10-30 @502  int LZ4_decompress_safe_forceExtDict(const char *source, char *dest,
2209fda323e2fd Gao Xiang    2018-10-30  503  				     int compressedSize, int maxOutputSize,
2209fda323e2fd Gao Xiang    2018-10-30  504  				     const void *dictStart, size_t dictSize)
2209fda323e2fd Gao Xiang    2018-10-30  505  {
2209fda323e2fd Gao Xiang    2018-10-30  506  	return LZ4_decompress_generic(source, dest,
2209fda323e2fd Gao Xiang    2018-10-30  507  				      compressedSize, maxOutputSize,
2209fda323e2fd Gao Xiang    2018-10-30  508  				      endOnInputSize, decode_full_block,
2209fda323e2fd Gao Xiang    2018-10-30  509  				      usingExtDict, (BYTE *)dest,
2209fda323e2fd Gao Xiang    2018-10-30  510  				      (const BYTE *)dictStart, dictSize);
2209fda323e2fd Gao Xiang    2018-10-30  511  }
2209fda323e2fd 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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