Re: [PATCH -next 3/8] ext4: fix extents-test.c is not compiled when EXT4_KUNIT_TESTS=M

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

Hi Ye,

kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20260309]

url:    https://github.com/intel-lab-lkp/linux/commits/Ye-Bin/ext4-fix-mballoc-test-c-is-not-compiled-when-EXT4_KUNIT_TESTS-M/20260310-225016
base:   next-20260309
patch link:    https://lore.kernel.org/r/20260310130412.3156753-4-yebin%40huaweicloud.com
patch subject: [PATCH -next 3/8] ext4: fix extents-test.c is not compiled when EXT4_KUNIT_TESTS=M
config: sh-defconfig (https://download.01.org/0day-ci/archive/20260311/202603111416.j2HqVIhj-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260311/202603111416.j2HqVIhj-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603111416.j2HqVIhj-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> fs/ext4/extents.c:187:5: warning: no previous prototype for '__ext4_ext_dirty' [-Wmissing-prototypes]
     187 | int __ext4_ext_dirty(const char *where, unsigned int line,
         |     ^~~~~~~~~~~~~~~~
>> fs/ext4/extents.c:3147:5: warning: no previous prototype for 'ext4_ext_zeroout' [-Wmissing-prototypes]
    3147 | int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex)
         |     ^~~~~~~~~~~~~~~~


vim +/__ext4_ext_dirty +187 fs/ext4/extents.c

   180	
   181	/*
   182	 * could return:
   183	 *  - EROFS
   184	 *  - ENOMEM
   185	 *  - EIO
   186	 */
 > 187	int __ext4_ext_dirty(const char *where, unsigned int line,
   188			     handle_t *handle, struct inode *inode,
   189			     struct ext4_ext_path *path)
   190	{
   191		int err;
   192	
   193		KUNIT_STATIC_STUB_REDIRECT(__ext4_ext_dirty, where, line, handle, inode,
   194					   path);
   195	
   196		WARN_ON(!rwsem_is_locked(&EXT4_I(inode)->i_data_sem));
   197		if (path->p_bh) {
   198			ext4_extent_block_csum_set(inode, ext_block_hdr(path->p_bh));
   199			/* path points to block */
   200			err = __ext4_handle_dirty_metadata(where, line, handle,
   201							   inode, path->p_bh);
   202			/* Extents updating done, re-set verified flag */
   203			if (!err)
   204				set_buffer_verified(path->p_bh);
   205		} else {
   206			/* path points to leaf/index in inode body */
   207			err = ext4_mark_inode_dirty(handle, inode);
   208		}
   209		return err;
   210	}
   211	

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