linux-kernel - [esmil:visionfive 19/80] mm/kasan/shadow.c:63:7: warning: no previous prototype for function 'memcpy'

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Date:   Wed, 19 Jan 2022 10:40:11 +0800
From:   kernel test robot <lkp@...el.com>
To:     Matteo Croce <mcroce@...rosoft.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Emil Renner Berthing <kernel@...il.dk>
Subject: [esmil:visionfive 19/80] mm/kasan/shadow.c:63:7: warning: no
 previous prototype for function 'memcpy'

tree:   https://github.com/esmil/linux visionfive
head:   e46c3a7e373e6faa03399f1a41c29cf7546c37cb
commit: 7c451b4efc456af4a20559eb4108b7f21b4c98b2 [19/80] riscv: optimized memcpy
config: riscv-randconfig-r042-20220118 (https://download.01.org/0day-ci/archive/20220119/202201191007.pTfIzJYE-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project f7b7138a62648f4019c55e4671682af1f851f295)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/esmil/linux/commit/7c451b4efc456af4a20559eb4108b7f21b4c98b2
        git remote add esmil https://github.com/esmil/linux
        git fetch --no-tags esmil visionfive
        git checkout 7c451b4efc456af4a20559eb4108b7f21b4c98b2
        # 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=riscv SHELL=/bin/bash mm/kasan/

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 >>):

>> mm/kasan/shadow.c:63:7: warning: no previous prototype for function 'memcpy' [-Wmissing-prototypes]
   void *memcpy(void *dest, const void *src, size_t len)
         ^
   mm/kasan/shadow.c:63:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void *memcpy(void *dest, const void *src, size_t len)
   ^
   static 
   1 warning generated.


vim +/memcpy +63 mm/kasan/shadow.c

bb359dbcb70085 Andrey Konovalov 2020-12-22  61  
bb359dbcb70085 Andrey Konovalov 2020-12-22  62  #undef memcpy
bb359dbcb70085 Andrey Konovalov 2020-12-22 @63  void *memcpy(void *dest, const void *src, size_t len)
bb359dbcb70085 Andrey Konovalov 2020-12-22  64  {
f00748bfa0246c Andrey Konovalov 2021-02-24  65  	if (!kasan_check_range((unsigned long)src, len, false, _RET_IP_) ||
f00748bfa0246c Andrey Konovalov 2021-02-24  66  	    !kasan_check_range((unsigned long)dest, len, true, _RET_IP_))
bb359dbcb70085 Andrey Konovalov 2020-12-22  67  		return NULL;
bb359dbcb70085 Andrey Konovalov 2020-12-22  68  
bb359dbcb70085 Andrey Konovalov 2020-12-22  69  	return __memcpy(dest, src, len);
bb359dbcb70085 Andrey Konovalov 2020-12-22  70  }
bb359dbcb70085 Andrey Konovalov 2020-12-22  71  

:::::: The code at line 63 was first introduced by commit
:::::: bb359dbcb70085a63e8bdbf14837a900750f0cf7 kasan: split out shadow.c from common.c

:::::: TO: Andrey Konovalov <andreyknvl@...gle.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

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