[kbusch:dma-register 1/4] block/bio.c:1155:6: warning: no previous prototype for 'bio_iov_dma_tag_set'

[kbusch:dma-register 1/4] block/bio.c:1155:6: warning: no previous prototype for 'bio_iov_dma_tag_set'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kbusch/linux.git dma-register
head:   9de6909fed20955193275bbf9c75ccc85553b7d8
commit: 8c38d1fa715ef4cd8c42a27cd252e66f99a440a3 [1/4] iouring/block/nvme: preregister dma mapped buffers
config: um-x86_64_defconfig (https://download.01.org/0day-ci/archive/20220719/202207192339.BezSHVyy-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/kbusch/linux.git/commit/?id=8c38d1fa715ef4cd8c42a27cd252e66f99a440a3
        git remote add kbusch https://git.kernel.org/pub/scm/linux/kernel/git/kbusch/linux.git
        git fetch --no-tags kbusch dma-register
        git checkout 8c38d1fa715ef4cd8c42a27cd252e66f99a440a3
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um SUBARCH=x86_64 SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

>> block/bio.c:1155:6: warning: no previous prototype for 'bio_iov_dma_tag_set' [-Wmissing-prototypes]
    1155 | void bio_iov_dma_tag_set(struct bio *bio, struct iov_iter *iter)
         |      ^~~~~~~~~~~~~~~~~~~
   block/bio.c:1170:13: warning: 'bio_put_pages' defined but not used [-Wunused-function]
    1170 | static void bio_put_pages(struct page **pages, size_t size, size_t off)
         |             ^~~~~~~~~~~~~


vim +/bio_iov_dma_tag_set +1155 block/bio.c

  1154	
> 1155	void bio_iov_dma_tag_set(struct bio *bio, struct iov_iter *iter)
  1156	{
  1157		size_t size = iov_iter_count(iter);
  1158	
  1159		bio->bi_vcnt = iter->nr_segs;
  1160		bio->bi_dma_tag = iter->dma_tag;
  1161		bio->bi_iter.bi_bvec_done = iter->iov_offset;
  1162		bio->bi_iter.bi_size = size;
  1163		bio->bi_opf |= REQ_NOMERGE;
  1164		bio_set_flag(bio, BIO_NO_PAGE_REF);
  1165		bio_set_flag(bio, BIO_DMA_TAGGED);
  1166	
  1167		iov_iter_advance(iter, bio->bi_iter.bi_size);
  1168	}
  1169	

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