linux-kernel - [chao:feature/dax 8/10] fs/f2fs/file.c:1107:22: warning: assignment to 'struct page *' from 'int' makes pointer from integer without a cast

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Date:   Mon, 8 Aug 2022 06:30:48 +0800
From:   kernel test robot <lkp@...el.com>
To:     Chao Yu <yuchao0@...wei.com>, Chao Yu <chao@...nel.org>
Cc:     kbuild-all@...ts.01.org, Chao Yu <yuchao0@...wei.com>,
        Chao Yu <chao@...nel.org>, linux-kernel@...r.kernel.org
Subject: [chao:feature/dax 8/10] fs/f2fs/file.c:1107:22: warning: assignment
 to 'struct page *' from 'int' makes pointer from integer without a cast

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git feature/dax
head:   42f73c9b2a369f724de6c1df5acb0bbde2688e35
commit: 59714a25c71315156f6ba8d49b3173915d6943cc [8/10] f2fs: handle layout changes to pinned DAX mappings
config: arm-randconfig-r001-20220807 (https://download.01.org/0day-ci/archive/20220808/202208080625.gFSUHC8I-lkp@intel.com/config)
compiler: arm-linux-gnueabi-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://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git/commit/?id=59714a25c71315156f6ba8d49b3173915d6943cc
        git remote add chao https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git
        git fetch --no-tags chao feature/dax
        git checkout 59714a25c71315156f6ba8d49b3173915d6943cc
        # 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=arm SHELL=/bin/bash fs/f2fs/

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

All warnings (new ones prefixed by >>):

   fs/f2fs/file.c: In function 'f2fs_file_mmap':
   fs/f2fs/file.c:585:14: error: implicit declaration of function 'daxdev_mapping_supported' [-Werror=implicit-function-declaration]
     585 |         if (!daxdev_mapping_supported(vma, F2FS_I_SB(inode)->s_daxdev))
         |              ^~~~~~~~~~~~~~~~~~~~~~~~
   fs/f2fs/file.c: In function 'f2fs_break_layouts':
   fs/f2fs/file.c:1107:24: error: implicit declaration of function 'dax_layout_busy_page' [-Werror=implicit-function-declaration]
    1107 |                 page = dax_layout_busy_page(inode->i_mapping);
         |                        ^~~~~~~~~~~~~~~~~~~~
>> fs/f2fs/file.c:1107:22: warning: assignment to 'struct page *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
    1107 |                 page = dax_layout_busy_page(inode->i_mapping);
         |                      ^
   cc1: some warnings being treated as errors


vim +1107 fs/f2fs/file.c

  1097	
  1098	int f2fs_break_layouts(struct inode *inode)
  1099	{
  1100		struct page *page;
  1101		int error;
  1102	
  1103		if (WARN_ON_ONCE(!rwsem_is_locked(&inode->i_mapping->invalidate_lock)))
  1104			return -EINVAL;
  1105	
  1106		do {
> 1107			page = dax_layout_busy_page(inode->i_mapping);
  1108			if (!page)
  1109				return 0;
  1110	
  1111			error = ___wait_var_event(&page->_refcount,
  1112					atomic_read(&page->_refcount) == 1,
  1113					TASK_INTERRUPTIBLE, 0, 0,
  1114					f2fs_wait_dax_page(inode));
  1115		} while (error == 0);
  1116	
  1117		return error;
  1118	}
  1119	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp