arch/mips/boot/compressed/../../lib/bswapsi.c:5:22: warning: no previous prototype for '__bswapsi2'

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8ab774587903771821b59471cc723bba6d893942
commit: f78b25ee922ef6faf59a258af1b9388ca894cfd9 mips: decompressor: do not copy source files while building
date:   5 days ago
config: mips-loongson1b_defconfig (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=f78b25ee922ef6faf59a258af1b9388ca894cfd9
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout f78b25ee922ef6faf59a258af1b9388ca894cfd9
        # 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@intel.com>

All warnings (new ones prefixed by >>):

   In file included from arch/mips/boot/compressed/bswapsi.c:2:
>> arch/mips/boot/compressed/../../lib/bswapsi.c:5:22: warning: no previous prototype for '__bswapsi2' [-Wmissing-prototypes]
       5 | unsigned int notrace __bswapsi2(unsigned int u)
         |                      ^~~~~~~~~~
--
   In file included from arch/mips/boot/compressed/ashldi3.c:2:
>> arch/mips/boot/compressed/../../../../lib/ashldi3.c:9:19: warning: no previous prototype for '__ashldi3' [-Wmissing-prototypes]
       9 | long long notrace __ashldi3(long long u, word_type b)
         |                   ^~~~~~~~~


vim +/__bswapsi2 +5 arch/mips/boot/compressed/../../lib/bswapsi.c

1ee3630a3e57f3 Ralf Baechle 2015-09-29   4  
aedcfbe06558a9 Harvey Hunt  2016-05-25  @5  unsigned int notrace __bswapsi2(unsigned int u)
1ee3630a3e57f3 Ralf Baechle 2015-09-29   6  {
1ee3630a3e57f3 Ralf Baechle 2015-09-29   7  	return (((u) & 0xff000000) >> 24) |
1ee3630a3e57f3 Ralf Baechle 2015-09-29   8  	       (((u) & 0x00ff0000) >>  8) |
1ee3630a3e57f3 Ralf Baechle 2015-09-29   9  	       (((u) & 0x0000ff00) <<  8) |
1ee3630a3e57f3 Ralf Baechle 2015-09-29  10  	       (((u) & 0x000000ff) << 24);
1ee3630a3e57f3 Ralf Baechle 2015-09-29  11  }
1ee3630a3e57f3 Ralf Baechle 2015-09-29  12  

:::::: The code at line 5 was first introduced by commit
:::::: aedcfbe06558a9f53002e82d5be64c6c94687726 MIPS: lib: Mark intrinsics notrace

:::::: TO: Harvey Hunt <harvey.hunt@imgtec.com>
:::::: CC: Ralf Baechle <ralf@linux-mips.org>

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

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