[PATCH 5/7] block: add emulation for simple copy

[kernel test robot]

Hi SelvaKumar,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on block/for-next]
[also build test WARNING on dm/for-next next-20210817]
[cannot apply to linus/master linux-nvme/for-next v5.14-rc6]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/SelvaKumar-S/block-make-bio_map_kern-non-static/20210817-193111
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
config: hexagon-randconfig-r013-20210816 (attached as .config)
compiler: clang version 12.0.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/c307f1051a72122d636502c6885df8b2b25ed697
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review SelvaKumar-S/block-make-bio_map_kern-non-static/20210817-193111
        git checkout c307f1051a72122d636502c6885df8b2b25ed697
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=hexagon 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

   block/blk-lib.c:197:5: warning: no previous prototype for function 'blk_copy_offload_submit_bio' [-Wmissing-prototypes]
   int blk_copy_offload_submit_bio(struct block_device *bdev,
       ^
   block/blk-lib.c:197:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int blk_copy_offload_submit_bio(struct block_device *bdev,
   ^
   static 
   block/blk-lib.c:250:5: warning: no previous prototype for function 'blk_copy_offload_scc' [-Wmissing-prototypes]
   int blk_copy_offload_scc(struct block_device *src_bdev, int nr_srcs,
       ^
   block/blk-lib.c:250:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int blk_copy_offload_scc(struct block_device *src_bdev, int nr_srcs,
   ^
   static 
>> block/blk-lib.c:336:5: warning: no previous prototype for function 'blk_submit_rw_buf' [-Wmissing-prototypes]
   int blk_submit_rw_buf(struct block_device *bdev, void *buf, sector_t buf_len,
       ^
   block/blk-lib.c:336:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int blk_submit_rw_buf(struct block_device *bdev, void *buf, sector_t buf_len,
   ^
   static 
   3 warnings generated.


vim +/blk_submit_rw_buf +336 block/blk-lib.c

   335	
 > 336	int blk_submit_rw_buf(struct block_device *bdev, void *buf, sector_t buf_len,
   337					sector_t sector, unsigned int op, gfp_t gfp_mask)
   338	{
   339		struct request_queue *q = bdev_get_queue(bdev);
   340		struct bio *bio, *parent = NULL;
   341		sector_t max_hw_len = min_t(unsigned int, queue_max_hw_sectors(q),
   342				queue_max_segments(q) << (PAGE_SHIFT - SECTOR_SHIFT));
   343		sector_t len, remaining;
   344		int ret;
   345	
   346		for (remaining = buf_len; remaining > 0; remaining -= len) {
   347			len = min_t(int, max_hw_len, remaining);
   348	retry:
   349			bio = bio_map_kern(q, buf, len << SECTOR_SHIFT, gfp_mask);
   350			if (IS_ERR(bio)) {
   351				len >>= 1;
   352				if (len)
   353					goto retry;
   354				return PTR_ERR(bio);
   355			}
   356	
   357			bio->bi_iter.bi_sector = sector;
   358			bio->bi_opf = op;
   359			bio_set_dev(bio, bdev);
   360			bio->bi_end_io = NULL;
   361			bio->bi_private = NULL;
   362	
   363			if (parent) {
   364				bio_chain(parent, bio);
   365				submit_bio(parent);
   366			}
   367			parent = bio;
   368			sector += len;
   369		}
   370		ret = submit_bio_wait(bio);
   371		bio_put(bio);
   372	
   373		return ret;
   374	}
   375	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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