[hare-scsi-devel:ata-trace.v3 2/73] drivers/ata/libata-core.c:972:13: warning: no previous prototype for function 'ata_dev_class_string'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git ata-trace.v3
head:   d973dee7af0328b9176e4a1710fb73093c334698
commit: 41c489a28ae800ac33f419ad83135261e9eba85c [2/73] libata: Add ata_port_classify() helper
config: i386-randconfig-r021-20211207 (https://download.01.org/0day-ci/archive/20211209/202112090629.8XnsDIKk-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 097a1cb1d5ebb3a0ec4bcaed8ba3ff6a8e33c00a)
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/hare/scsi-devel.git/commit/?id=41c489a28ae800ac33f419ad83135261e9eba85c
        git remote add hare-scsi-devel https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git
        git fetch --no-tags hare-scsi-devel ata-trace.v3
        git checkout 41c489a28ae800ac33f419ad83135261e9eba85c
        # 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=i386 SHELL=/bin/bash arch/x86/kernel/ drivers/ata/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> drivers/ata/libata-core.c:972:13: warning: no previous prototype for function 'ata_dev_class_string' [-Wmissing-prototypes]
   const char *ata_dev_class_string(unsigned int class)
               ^
   drivers/ata/libata-core.c:972:7: note: declare 'static' if the function is not intended to be used outside of this translation unit
   const char *ata_dev_class_string(unsigned int class)
         ^
   static 
   1 warning generated.


vim +/ata_dev_class_string +972 drivers/ata/libata-core.c

   971	
 > 972	const char *ata_dev_class_string(unsigned int class)
   973	{
   974		static const char * const class_str[] = {
   975			"unknown",
   976			"ATA",
   977			"ATA (unsupported)",
   978			"ATAPI",
   979			"ATAPI (unsupported",
   980			"PMP",
   981			"PMP (unsupported)",
   982			"SEMB",
   983			"SEMB (unsupported)",
   984			"ZAC",
   985			"ZAC (unsupported)",
   986			"none",
   987		};
   988		if (class == 0 || (class - 1) >= ARRAY_SIZE(class_str))
   989			return "unknown";
   990		return class_str[class - 1];
   991	}
   992	

---
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