[brauner-github:vfs-6.18.iomap 1/1] fs/iomap/direct-io.c:281:36: warning: initialization of 'struct folio *' from 'int' makes pointer from integer without a cast

[brauner-github:vfs-6.18.iomap 1/1] fs/iomap/direct-io.c:281:36: warning: initialization of 'struct folio *' from 'int' makes pointer from integer without a cast

[kernel test robot]

tree:   https://github.com/brauner/linux.git vfs-6.18.iomap
head:   5589673e8d8d31ff2cec82181676c510e5afdb8d
commit: 5589673e8d8d31ff2cec82181676c510e5afdb8d [1/1] iomap: use largest_zero_folio() in iomap_dio_zero()
config: x86_64-buildonly-randconfig-003-20250815 (https://download.01.org/0day-ci/archive/20250816/202508160103.feZXu0ig-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14+deb12u1) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250816/202508160103.feZXu0ig-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/202508160103.feZXu0ig-lkp@intel.com/

All warnings (new ones prefixed by >>):

   fs/iomap/direct-io.c: In function 'iomap_dio_zero':
   fs/iomap/direct-io.c:281:36: error: implicit declaration of function 'largest_zero_folio'; did you mean 'is_zero_folio'? [-Werror=implicit-function-declaration]
     281 |         struct folio *zero_folio = largest_zero_folio();
         |                                    ^~~~~~~~~~~~~~~~~~
         |                                    is_zero_folio
>> fs/iomap/direct-io.c:281:36: warning: initialization of 'struct folio *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
   cc1: some warnings being treated as errors


vim +281 fs/iomap/direct-io.c

   275	
   276	static int iomap_dio_zero(const struct iomap_iter *iter, struct iomap_dio *dio,
   277			loff_t pos, unsigned len)
   278	{
   279		struct inode *inode = file_inode(dio->iocb->ki_filp);
   280		struct bio *bio;
 > 281		struct folio *zero_folio = largest_zero_folio();
   282		int nr_vecs = max(1, i_blocksize(inode) / folio_size(zero_folio));
   283	
   284		if (!len)
   285			return 0;
   286	
   287		/*
   288		 * This limit shall never be reached as most filesystems have a
   289		 * maximum blocksize of 64k.
   290		 */
   291		if (WARN_ON_ONCE(nr_vecs > BIO_MAX_VECS))
   292			return -EINVAL;
   293	
   294		bio = iomap_dio_alloc_bio(iter, dio, nr_vecs,
   295					  REQ_OP_WRITE | REQ_SYNC | REQ_IDLE);
   296		fscrypt_set_bio_crypt_ctx(bio, inode, pos >> inode->i_blkbits,
   297					  GFP_KERNEL);
   298		bio->bi_iter.bi_sector = iomap_sector(&iter->iomap, pos);
   299		bio->bi_private = dio;
   300		bio->bi_end_io = iomap_dio_bio_end_io;
   301	
   302		while (len > 0) {
   303			unsigned int io_len = min(len, folio_size(zero_folio));
   304	
   305			bio_add_folio_nofail(bio, zero_folio, io_len, 0);
   306			len -= io_len;
   307		}
   308		iomap_dio_submit_bio(iter, dio, bio, pos);
   309	
   310		return 0;
   311	}
   312	

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