[hch-misc:block-new-helpers 3/18] block/bio.c:1317: warning: Function parameter or struct member 'len' not described in 'bdev_rw_virt'

[hch-misc:block-new-helpers 3/18] block/bio.c:1317: warning: Function parameter or struct member 'len' not described in 'bdev_rw_virt'

[kernel test robot]

tree:   git://git.infradead.org/users/hch/misc.git block-new-helpers
head:   280d8b7173282de4cf4857624def142ed24fad63
commit: dc18223aaea3f28ee4b98928d16baf4a6ffd4212 [3/18] block: add a bdev_rw_virt helper
config: loongarch-randconfig-002-20250422 (https://download.01.org/0day-ci/archive/20250422/202504220307.K00i54m7-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250422/202504220307.K00i54m7-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/202504220307.K00i54m7-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> block/bio.c:1317: warning: Function parameter or struct member 'len' not described in 'bdev_rw_virt'
>> block/bio.c:1317: warning: Excess function parameter 'lem' description in 'bdev_rw_virt'


vim +1317 block/bio.c

  1303	
  1304	/**
  1305	 * bdev_rw_virt - synchronously read into / write from kernel mapping
  1306	 * @bdev:	block device to access
  1307	 * @sector:	sector to accasse
  1308	 * @data:	data to read/write
  1309	 * @lem:	length to read/write
  1310	 * @op:		operation (e.g. REQ_OP_READ/REQ_OP_WRITE)
  1311	 *
  1312	 * Performs synchronous I/O to @bdev for @data/@len.  @data must be in
  1313	 * the kernel direct mapping and not a vmalloc address.
  1314	 */
  1315	int bdev_rw_virt(struct block_device *bdev, sector_t sector, void *data,
  1316			size_t len, enum req_op op)
> 1317	{
  1318		struct bio_vec bv;
  1319		struct bio bio;
  1320		int error;
  1321	
  1322		if (WARN_ON_ONCE(is_vmalloc_addr(data)))
  1323			return -EIO;
  1324	
  1325		bio_init(&bio, bdev, &bv, 1, op);
  1326		bio.bi_iter.bi_sector = sector;
  1327		bio_add_virt_nofail(&bio, data, len);
  1328		error = submit_bio_wait(&bio);
  1329		bio_uninit(&bio);
  1330		return error;
  1331	}
  1332	EXPORT_SYMBOL_GPL(bdev_rw_virt);
  1333	

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