[akpm-mm:mm-unstable 179/180] fs/xfs/xfs_file.c:1273:1: warning: no previous prototype for function 'xfs_dax_fault'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
head:   f06e3c5104126b9a6660b58f29619b53bfa33b2b
commit: d5f5b32dee7c09e3152cbbce45c73f0b1ea7d94c [179/180] xfs: support CoW in fsdax mode
config: x86_64-randconfig-a014 (https://download.01.org/0day-ci/archive/20220604/202206041624.kUCMuYuP-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project b364c76683f8ef241025a9556300778c07b590c2)
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/akpm/mm.git/commit/?id=d5f5b32dee7c09e3152cbbce45c73f0b1ea7d94c
        git remote add akpm-mm https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git
        git fetch --no-tags akpm-mm mm-unstable
        git checkout d5f5b32dee7c09e3152cbbce45c73f0b1ea7d94c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash fs/xfs/ mm/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> fs/xfs/xfs_file.c:1273:1: warning: no previous prototype for function 'xfs_dax_fault' [-Wmissing-prototypes]
   xfs_dax_fault(
   ^
   fs/xfs/xfs_file.c:1272:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int
   ^
   static 
   1 warning generated.


vim +/xfs_dax_fault +1273 fs/xfs/xfs_file.c

  1257	
  1258	#ifdef CONFIG_FS_DAX
  1259	int
  1260	xfs_dax_fault(
  1261		struct vm_fault		*vmf,
  1262		enum page_entry_size	pe_size,
  1263		bool			write_fault,
  1264		pfn_t			*pfn)
  1265	{
  1266		return dax_iomap_fault(vmf, pe_size, pfn, NULL,
  1267				(write_fault && !vmf->cow_page) ?
  1268					&xfs_dax_write_iomap_ops :
  1269					&xfs_read_iomap_ops);
  1270	}
  1271	#else
  1272	int
> 1273	xfs_dax_fault(
  1274		struct vm_fault		*vmf,
  1275		enum page_entry_size	pe_size,
  1276		bool			write_fault,
  1277		pfn_t			*pfn)
  1278	{
  1279		return 0;
  1280	}
  1281	#endif
  1282	

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