Re: [PATCH 2/5] block: add support for copy offload

[kernel test robot <lkp@intel.com>]

Hi Keith,

kernel test robot noticed the following build warnings:

[auto build test WARNING on axboe-block/for-next]
[also build test WARNING on next-20250521]
[cannot apply to linux-nvme/for-next brauner-vfs/vfs.all linus/master v6.15-rc7]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Keith-Busch/block-new-sector-copy-api/20250522-063316
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
patch link:    https://lore.kernel.org/r/20250521223107.709131-3-kbusch%40meta.com
patch subject: [PATCH 2/5] block: add support for copy offload
config: x86_64-buildonly-randconfig-001-20250522 (https://download.01.org/0day-ci/archive/20250522/202505221702.EcgNFozB-lkp@intel.com/config)
compiler: clang version 20.1.2 (https://github.com/llvm/llvm-project 58df0ef89dd64126512e4ee27b4ac3fd8ddf6247)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250522/202505221702.EcgNFozB-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/202505221702.EcgNFozB-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> block/blk-integrity.c:29:31: warning: suggest braces around initialization of subobject [-Wmissing-braces]
      29 |         struct bio_vec iv, ivprv = { NULL };
         |                                      ^~~~
         |                                      {   }
   include/linux/stddef.h:8:14: note: expanded from macro 'NULL'
       8 | #define NULL ((void *)0)
         |              ^~~~~~~~~~~
   block/blk-integrity.c:69:31: warning: suggest braces around initialization of subobject [-Wmissing-braces]
      69 |         struct bio_vec iv, ivprv = { NULL };
         |                                      ^~~~
         |                                      {   }
   include/linux/stddef.h:8:14: note: expanded from macro 'NULL'
       8 | #define NULL ((void *)0)
         |              ^~~~~~~~~~~
   2 warnings generated.


vim +29 block/blk-integrity.c

7ba1ba12eeef0a Martin K. Petersen 2008-06-30  18  
7ba1ba12eeef0a Martin K. Petersen 2008-06-30  19  /**
7ba1ba12eeef0a Martin K. Petersen 2008-06-30  20   * blk_rq_count_integrity_sg - Count number of integrity scatterlist elements
13f05c8d8e98bb Martin K. Petersen 2010-09-10  21   * @q:		request queue
13f05c8d8e98bb Martin K. Petersen 2010-09-10  22   * @bio:	bio with integrity metadata attached
7ba1ba12eeef0a Martin K. Petersen 2008-06-30  23   *
7ba1ba12eeef0a Martin K. Petersen 2008-06-30  24   * Description: Returns the number of elements required in a
13f05c8d8e98bb Martin K. Petersen 2010-09-10  25   * scatterlist corresponding to the integrity metadata in a bio.
7ba1ba12eeef0a Martin K. Petersen 2008-06-30  26   */
13f05c8d8e98bb Martin K. Petersen 2010-09-10  27  int blk_rq_count_integrity_sg(struct request_queue *q, struct bio *bio)
7ba1ba12eeef0a Martin K. Petersen 2008-06-30  28  {
d57a5f7c6605f1 Kent Overstreet    2013-11-23 @29  	struct bio_vec iv, ivprv = { NULL };
13f05c8d8e98bb Martin K. Petersen 2010-09-10  30  	unsigned int segments = 0;
13f05c8d8e98bb Martin K. Petersen 2010-09-10  31  	unsigned int seg_size = 0;
d57a5f7c6605f1 Kent Overstreet    2013-11-23  32  	struct bvec_iter iter;
d57a5f7c6605f1 Kent Overstreet    2013-11-23  33  	int prev = 0;
7ba1ba12eeef0a Martin K. Petersen 2008-06-30  34  
d57a5f7c6605f1 Kent Overstreet    2013-11-23  35  	bio_for_each_integrity_vec(iv, bio, iter) {
7ba1ba12eeef0a Martin K. Petersen 2008-06-30  36  
d57a5f7c6605f1 Kent Overstreet    2013-11-23  37  		if (prev) {
3dccdae54fe836 Christoph Hellwig  2018-09-24  38  			if (!biovec_phys_mergeable(q, &ivprv, &iv))
13f05c8d8e98bb Martin K. Petersen 2010-09-10  39  				goto new_segment;
d57a5f7c6605f1 Kent Overstreet    2013-11-23  40  			if (seg_size + iv.bv_len > queue_max_segment_size(q))
13f05c8d8e98bb Martin K. Petersen 2010-09-10  41  				goto new_segment;
7ba1ba12eeef0a Martin K. Petersen 2008-06-30  42  
d57a5f7c6605f1 Kent Overstreet    2013-11-23  43  			seg_size += iv.bv_len;
13f05c8d8e98bb Martin K. Petersen 2010-09-10  44  		} else {
13f05c8d8e98bb Martin K. Petersen 2010-09-10  45  new_segment:
7ba1ba12eeef0a Martin K. Petersen 2008-06-30  46  			segments++;
d57a5f7c6605f1 Kent Overstreet    2013-11-23  47  			seg_size = iv.bv_len;
13f05c8d8e98bb Martin K. Petersen 2010-09-10  48  		}
7ba1ba12eeef0a Martin K. Petersen 2008-06-30  49  
d57a5f7c6605f1 Kent Overstreet    2013-11-23  50  		prev = 1;
7ba1ba12eeef0a Martin K. Petersen 2008-06-30  51  		ivprv = iv;
7ba1ba12eeef0a Martin K. Petersen 2008-06-30  52  	}
7ba1ba12eeef0a Martin K. Petersen 2008-06-30  53  
7ba1ba12eeef0a Martin K. Petersen 2008-06-30  54  	return segments;
7ba1ba12eeef0a Martin K. Petersen 2008-06-30  55  }
7ba1ba12eeef0a Martin K. Petersen 2008-06-30  56  

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