linux-kernel - [esmil:visionfive 4/62] mm/kasan/shadow.c:42:7: warning: no previous prototype for function 'memset'

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Date:   Thu, 31 Mar 2022 18:05:33 +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 4/62] mm/kasan/shadow.c:42:7: warning: no previous
 prototype for function 'memset'

tree:   https://github.com/esmil/linux visionfive
head:   6c7cd35771680c033c40b4af48cbe7e3093eab3d
commit: 25b1ed58675d7210b11e3492dcd5785f983d2b4a [4/62] riscv: optimized memset
config: riscv-randconfig-r042-20220331 (https://download.01.org/0day-ci/archive/20220331/202203311721.E2WjyRUE-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 22a95dd3e6c911c2854dd75f42ba32d34840a61a)
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/25b1ed58675d7210b11e3492dcd5785f983d2b4a
        git remote add esmil https://github.com/esmil/linux
        git fetch --no-tags esmil visionfive
        git checkout 25b1ed58675d7210b11e3492dcd5785f983d2b4a
        # 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:42:7: warning: no previous prototype for function 'memset' [-Wmissing-prototypes]
   void *memset(void *addr, int c, size_t len)
         ^
   mm/kasan/shadow.c:42:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void *memset(void *addr, int c, size_t len)
   ^
   static 
   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 
   2 warnings generated.


vim +/memset +42 mm/kasan/shadow.c

bb359dbcb70085a Andrey Konovalov 2020-12-22  40  
bb359dbcb70085a Andrey Konovalov 2020-12-22  41  #undef memset
bb359dbcb70085a Andrey Konovalov 2020-12-22 @42  void *memset(void *addr, int c, size_t len)
bb359dbcb70085a Andrey Konovalov 2020-12-22  43  {
f00748bfa0246c4 Andrey Konovalov 2021-02-24  44  	if (!kasan_check_range((unsigned long)addr, len, true, _RET_IP_))
bb359dbcb70085a Andrey Konovalov 2020-12-22  45  		return NULL;
bb359dbcb70085a Andrey Konovalov 2020-12-22  46  
bb359dbcb70085a Andrey Konovalov 2020-12-22  47  	return __memset(addr, c, len);
bb359dbcb70085a Andrey Konovalov 2020-12-22  48  }
bb359dbcb70085a Andrey Konovalov 2020-12-22  49  

:::::: The code at line 42 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>

-- 
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https://01.org/lkp