fs/bpf_fs_kfuncs.c:377:26: sparse: sparse: symbol 'bpf_real_data_inode' was not declared. Should it be static?

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   9b87fdc9af2fbfcdb5c24a64139685ef80f6573f
commit: 3f8c65b06fafc3f779abda5f7b81707411d05d4c bpf: have bpf_real_data_inode() take a struct file
date:   3 months ago
config: arm64-randconfig-r1307-20260918 (https://download.01.org/0day-ci/archive/20260918/202609181925.AkvGgS6u-lkp@xxxxxxxxx/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 7252edd9aa82ef1c570ff6694ef7f4763a8a5d2f)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260918/202609181925.AkvGgS6u-lkp@xxxxxxxxx/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
| Fixes: 3f8c65b06faf ("bpf: have bpf_real_data_inode() take a struct file")
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202609181925.AkvGgS6u-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
>> fs/bpf_fs_kfuncs.c:377:26: sparse: sparse: symbol 'bpf_real_data_inode' was not declared. Should it be static?

vim +/bpf_real_data_inode +377 fs/bpf_fs_kfuncs.c

   361	
   362	/**
   363	 * bpf_real_data_inode - get the real inode hosting a file's data
   364	 * @file: file to resolve
   365	 *
   366	 * Resolve @file to the inode that hosts its data. For a regular file on a
   367	 * union/overlay filesystem this is the underlying (upper or lower) inode that
   368	 * stores the data, not the overlay inode.
   369	 *
   370	 * Data resolution only applies to regular files. For a non-regular file (e.g.
   371	 * a device node, fifo or socket) on a union/overlay filesystem the overlay
   372	 * inode itself is returned; for any file on a non-union filesystem the inode
   373	 * attached to @file is returned.
   374	 *
   375	 * Return: The inode hosting @file's data, or NULL.
   376	 */
 > 377	__bpf_kfunc struct inode *bpf_real_data_inode(struct file *file)
   378	{
   379		return d_real_inode(file_dentry(file));
   380	}
   381	

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