Re: [PATCH v11 8/8] fsdax: set a CoW flag when associate reflink mappings

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

Hi Shiyang,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on xfs-linux/for-next]
[also build test WARNING on linux/master]
[cannot apply to hnaz-mm/master linus/master v5.17-rc5 next-20220225]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Shiyang-Ruan/fsdax-introduce-fs-query-to-support-reflink/20220227-200849
base:   https://git.kernel.org/pub/scm/fs/xfs/xfs-linux.git for-next
config: i386-randconfig-a013 (https://download.01.org/0day-ci/archive/20220227/202202272359.2aizNPgB-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
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://github.com/0day-ci/linux/commit/a0ac78065bbb4fbb3e5477c32686eca3b9f0e1ef
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Shiyang-Ruan/fsdax-introduce-fs-query-to-support-reflink/20220227-200849
        git checkout a0ac78065bbb4fbb3e5477c32686eca3b9f0e1ef
        # 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

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 >>):

>> fs/dax.c:337:67: warning: parameter 'mapping' set but not used [-Wunused-but-set-parameter]
   static inline void dax_mapping_set_cow_flag(struct address_space *mapping)
                                                                     ^
   1 warning generated.


vim +/mapping +337 fs/dax.c

   328	
   329	/*
   330	 * Iterate through all mapped pfns represented by an entry, i.e. skip
   331	 * 'empty' and 'zero' entries.
   332	 */
   333	#define for_each_mapped_pfn(entry, pfn) \
   334		for (pfn = dax_to_pfn(entry); \
   335				pfn < dax_end_pfn(entry); pfn++)
   336	
 > 337	static inline void dax_mapping_set_cow_flag(struct address_space *mapping)
   338	{
   339		mapping = (struct address_space *)PAGE_MAPPING_DAX_COW;
   340	}
   341	

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