[PATCH v3 7/9] erofs: implement .mmap for page cache sharing

[kernel test robot]

Hi Jingbo,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on xiang-erofs/dev-test]
[also build test WARNING on xiang-erofs/dev xiang-erofs/fixes linus/master v6.2-rc6 next-20230203]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Jingbo-Xu/erofs-support-readahead-in-meta-routine/20230203-110255
base:   https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git dev-test
patch link:    https://lore.kernel.org/r/20230203030143.73105-8-jefflexu%40linux.alibaba.com
patch subject: [PATCH v3 7/9] erofs: implement .mmap for page cache sharing
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20230203/202302032301.KaFzWF1g-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 12.1.0
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/intel-lab-lkp/linux/commit/499758ba5c442083b32a76a3fd55b734df0c486b
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Jingbo-Xu/erofs-support-readahead-in-meta-routine/20230203-110255
        git checkout 499758ba5c442083b32a76a3fd55b734df0c486b
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash fs/erofs/

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

All warnings (new ones prefixed by >>):

>> fs/erofs/fscache.c:435:12: warning: no previous prototype for 'erofs_fscache_share_fault' [-Wmissing-prototypes]
     435 | vm_fault_t erofs_fscache_share_fault(struct vm_fault *vmf)
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~


vim +/erofs_fscache_share_fault +435 fs/erofs/fscache.c

   434	
 > 435	vm_fault_t erofs_fscache_share_fault(struct vm_fault *vmf)
   436	{
   437		struct erofs_fscache_finfo *finfo = vmf->vma->vm_file->private_data;
   438	
   439		if (unlikely(vmf->pgoff >= finfo->max_idx))
   440			return VM_FAULT_SIGBUS;
   441		return filemap_fault(vmf);
   442	}
   443	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests