linux-kernel - arch/mips/boot/compressed/uart-16550.c:44:6: warning: no previous prototype for function 'putc'

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Date:   Mon, 14 Mar 2022 04:21:22 +0800
From:   kernel test robot <lkp@...el.com>
To:     Gal Pressman <gal@...dia.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
        Tariq Toukan <tariqt@...dia.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: arch/mips/boot/compressed/uart-16550.c:44:6: warning: no previous
 prototype for function 'putc'

Hi Gal,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f0e18b03fcafd8344539101f564ae358950ae892
commit: 48cec899e357cfb92d022a9c0df6bbe72a7f6951 tcp: Add a stub for sk_defer_free_flush()
date:   7 weeks ago
config: mips-randconfig-r016-20220313 (https://download.01.org/0day-ci/archive/20220314/202203140415.rtqGbgJn-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0467eb2cb7654c15ae366967ef35093c5724c416)
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 mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=48cec899e357cfb92d022a9c0df6bbe72a7f6951
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 48cec899e357cfb92d022a9c0df6bbe72a7f6951
        # 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=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 >>):

>> arch/mips/boot/compressed/uart-16550.c:44:6: warning: no previous prototype for function 'putc' [-Wmissing-prototypes]
   void putc(char c)
        ^
   arch/mips/boot/compressed/uart-16550.c:44:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void putc(char c)
   ^
   static 
   1 warning generated.


vim +/putc +44 arch/mips/boot/compressed/uart-16550.c

1b93b3c3e94be2 Wu Zhangjin 2009-10-14  43  
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 @44  void putc(char c)

:::::: The code at line 44 was first introduced by commit
:::::: 1b93b3c3e94be2605759735a89fc935ba5f58dcf MIPS: Add support for GZIP / BZIP2 / LZMA compressed kernel images

:::::: TO: Wu Zhangjin <wuzhangjin@...il.com>
:::::: CC: Ralf Baechle <ralf@...ux-mips.org>

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