arch/mips/boot/compressed/dbg.c:12:13: warning: no previous prototype for function 'putc'

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

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Hi Thomas,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7cca308cfdc0725363ac5943dca9dcd49cc1d2d5
commit: 396c7d94c3bbe07ae00c9f694a5c731878843038 MIPS: alchemy: Fix build breakage, if TOUCHSCREEN_WM97XX is disabled
date:   11 months ago
config: mips-randconfig-r016-20210903 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 1104e3258b5064e7110cc297e2cec60ac9acfc0a)
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=396c7d94c3bbe07ae00c9f694a5c731878843038
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 396c7d94c3bbe07ae00c9f694a5c731878843038
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang 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 >>):

>> arch/mips/boot/compressed/dbg.c:12:13: warning: no previous prototype for function 'putc' [-Wmissing-prototypes]
   void __weak putc(char c)
               ^
   arch/mips/boot/compressed/dbg.c:12:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __weak putc(char c)
   ^
   static 
>> arch/mips/boot/compressed/dbg.c:16:6: warning: no previous prototype for function 'puts' [-Wmissing-prototypes]
   void puts(const char *s)
        ^
   arch/mips/boot/compressed/dbg.c:16:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void puts(const char *s)
   ^
   static 
>> arch/mips/boot/compressed/dbg.c:26:6: warning: no previous prototype for function 'puthex' [-Wmissing-prototypes]
   void puthex(unsigned long long val)
        ^
   arch/mips/boot/compressed/dbg.c:26:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void puthex(unsigned long long val)
   ^
   static 
   3 warnings generated.
--
>> arch/mips/boot/compressed/uart-alchemy.c:4:6: warning: no previous prototype for function 'putc' [-Wmissing-prototypes]
   void putc(char c)
        ^
   arch/mips/boot/compressed/uart-alchemy.c:4:1: 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 +12 arch/mips/boot/compressed/dbg.c

1b93b3c3e94be2 Wu Zhangjin 2009-10-14  11  
e52dd9fc6b9e0c Wu Zhangjin 2010-01-26 @12  void __weak putc(char c)
1b93b3c3e94be2 Wu Zhangjin 2009-10-14  13  {
1b93b3c3e94be2 Wu Zhangjin 2009-10-14  14  }
1b93b3c3e94be2 Wu Zhangjin 2009-10-14  15  
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 @16  void puts(const char *s)
1b93b3c3e94be2 Wu Zhangjin 2009-10-14  17  {
1b93b3c3e94be2 Wu Zhangjin 2009-10-14  18  	char c;
1b93b3c3e94be2 Wu Zhangjin 2009-10-14  19  	while ((c = *s++) != '\0') {
1b93b3c3e94be2 Wu Zhangjin 2009-10-14  20  		putc(c);
1b93b3c3e94be2 Wu Zhangjin 2009-10-14  21  		if (c == '\n')
1b93b3c3e94be2 Wu Zhangjin 2009-10-14  22  			putc('\r');
1b93b3c3e94be2 Wu Zhangjin 2009-10-14  23  	}
1b93b3c3e94be2 Wu Zhangjin 2009-10-14  24  }
1b93b3c3e94be2 Wu Zhangjin 2009-10-14  25  
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 @26  void puthex(unsigned long long val)

:::::: The code at line 12 was first introduced by commit
:::::: e52dd9fc6b9e0c17b220bd38371ff15032a1a155 MIPS: Simplify the weak annotation with __weak

:::::: TO: Wu Zhangjin <wuzhangjin@gmail.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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