linux-kernel - arch/mips/boot/compressed/../../lib/bswapdi.c:5:28: warning: no previous prototype for '_

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Date:   Fri, 18 Mar 2022 07:01:39 +0800
From:   kernel test robot <lkp@...el.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Subject: arch/mips/boot/compressed/../../lib/bswapdi.c:5:28: warning: no
 previous prototype for '__bswapdi2'

Hi Masahiro,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   56e337f2cf1326323844927a04e9dbce9a244835
commit: f78b25ee922ef6faf59a258af1b9388ca894cfd9 mips: decompressor: do not copy source files while building
date:   4 months ago
config: mips-randconfig-r036-20220317 (https://download.01.org/0day-ci/archive/20220318/202203180644.cQo8rUA8-lkp@intel.com/config)
compiler: mips-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 config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross 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@...el.com>

All warnings (new ones prefixed by >>):

   In file included from arch/mips/boot/compressed/bswapdi.c:2:
>> arch/mips/boot/compressed/../../lib/bswapdi.c:5:28: warning: no previous prototype for '__bswapdi2' [-Wmissing-prototypes]
       5 | unsigned long long notrace __bswapdi2(unsigned long long u)
         |                            ^~~~~~~~~~


vim +/__bswapdi2 +5 arch/mips/boot/compressed/../../lib/bswapdi.c

1ee3630a3e57f3 Ralf Baechle 2015-09-29   4  
aedcfbe06558a9 Harvey Hunt  2016-05-25  @5  unsigned long long notrace __bswapdi2(unsigned long long u)
1ee3630a3e57f3 Ralf Baechle 2015-09-29   6  {
1ee3630a3e57f3 Ralf Baechle 2015-09-29   7  	return (((u) & 0xff00000000000000ull) >> 56) |
1ee3630a3e57f3 Ralf Baechle 2015-09-29   8  	       (((u) & 0x00ff000000000000ull) >> 40) |
1ee3630a3e57f3 Ralf Baechle 2015-09-29   9  	       (((u) & 0x0000ff0000000000ull) >> 24) |
1ee3630a3e57f3 Ralf Baechle 2015-09-29  10  	       (((u) & 0x000000ff00000000ull) >>  8) |
1ee3630a3e57f3 Ralf Baechle 2015-09-29  11  	       (((u) & 0x00000000ff000000ull) <<  8) |
1ee3630a3e57f3 Ralf Baechle 2015-09-29  12  	       (((u) & 0x0000000000ff0000ull) << 24) |
1ee3630a3e57f3 Ralf Baechle 2015-09-29  13  	       (((u) & 0x000000000000ff00ull) << 40) |
1ee3630a3e57f3 Ralf Baechle 2015-09-29  14  	       (((u) & 0x00000000000000ffull) << 56);
1ee3630a3e57f3 Ralf Baechle 2015-09-29  15  }
1ee3630a3e57f3 Ralf Baechle 2015-09-29  16  

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

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

---
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