Re: [PATCH] block/blk-iolatency: Add the processing flow of the chained bio in the QoS and define the related types to solve the problem of incorrect inflight processing in the QoS. The usage of the done_split_bio abstract function in the blk-iolatency project.

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

Hi Li,

kernel test robot noticed the following build errors:

[auto build test ERROR on axboe/for-next]
[also build test ERROR on linus/master v7.1-rc1 next-20260430]
[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/Li-kunyu/block-blk-iolatency-Add-the-processing-flow-of-the-chained-bio-in-the-QoS-and-define-the-related-types-to-solve-the-prob/20260502-071718
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux.git for-next
patch link:    https://lore.kernel.org/r/20260429094148.2394-1-likunyu10%40163.com
patch subject: [PATCH] block/blk-iolatency: Add the processing flow of the chained bio in the QoS and define the related types to solve the problem of incorrect inflight processing in the QoS. The usage of the done_split_bio abstract function in the blk-iolatency project.
config: s390-allnoconfig (https://download.01.org/0day-ci/archive/20260503/202605030844.RgfP9Jsd-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260503/202605030844.RgfP9Jsd-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/202605030844.RgfP9Jsd-lkp@intel.com/

All errors (new ones prefixed by >>):

>> block/blk-merge.c:159:17: error: use of undeclared identifier 'split'
     159 |                         bio_set_flag(split, BIO_QOS_CHAIN_CHILD);
         |                                      ^~~~~
   1 error generated.


vim +/split +159 block/blk-merge.c

   142	
   143	static struct bio *bio_submit_split(struct bio *bio, int split_sectors)
   144	{
   145		if (unlikely(split_sectors < 0)) {
   146			bio->bi_status = errno_to_blk_status(split_sectors);
   147			bio_endio(bio);
   148			return NULL;
   149		}
   150	
   151		if (split_sectors) {
   152			bio = bio_submit_split_bioset(bio, split_sectors,
   153					&bio->bi_bdev->bd_disk->bio_split);
   154			if (bio) {
   155				bio->bi_opf |= REQ_NOMERGE;
   156				/* Fix the issue where the inflight statistics
   157				 * of the chained bio in the QoS are incorrect.
   158				 */
 > 159				bio_set_flag(split, BIO_QOS_CHAIN_CHILD);
   160			}
   161		}
   162	
   163		return bio;
   164	}
   165	

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