Re: [PATCH] md: support to align bio to limits

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

Hi Yu,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.18-rc7 next-20251124]
[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/Yu-Kuai/md-support-to-align-bio-to-limits/20251121-131703
base:   linus/master
patch link:    https://lore.kernel.org/r/20251121051406.1316884-3-yukuai%40fnnas.com
patch subject: [PATCH] md: support to align bio to limits
config: i386-randconfig-002-20251125 (https://download.01.org/0day-ci/archive/20251125/202511250848.gq6d7JeR-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251125/202511250848.gq6d7JeR-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/202511250848.gq6d7JeR-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: drivers/md/md.o: in function `__md_bio_align_to_limits':
>> drivers/md/md.c:434:(.text+0x68e4): undefined reference to `__umoddi3'
>> ld: drivers/md/md.c:443:(.text+0x693a): undefined reference to `__umoddi3'


vim +434 drivers/md/md.c

   428	
   429	static struct bio *__md_bio_align_to_limits(struct mddev *mddev,
   430						    struct bio *bio)
   431	{
   432		unsigned int max_sectors = mddev->gendisk->queue->limits.max_sectors;
   433		sector_t start = bio->bi_iter.bi_sector;
 > 434		sector_t align_start = roundup(start, max_sectors);
   435		sector_t end;
   436		sector_t align_end;
   437	
   438		/* already aligned */
   439		if (align_start == start)
   440			return bio;
   441	
   442		end = start + bio_sectors(bio);
 > 443		align_end = rounddown(end, max_sectors);
   444	
   445		/* bio is too small to split */
   446		if (align_end <= align_start)
   447			return bio;
   448	
   449		return bio_submit_split_bioset(bio, align_start - start,
   450					       &mddev->gendisk->bio_split);
   451	}
   452	

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