Re: [PATCH v2] btrfs: zoned: fix alloc_offset calculation for partly conventional block groups

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

Hi Johannes,

kernel test robot noticed the following build errors:

[auto build test ERROR on kdave/for-next]
[also build test ERROR on linus/master v6.15 next-20250605]
[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/Johannes-Thumshirn/btrfs-zoned-fix-alloc_offset-calculation-for-partly-conventional-block-groups/20250605-171925
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next
patch link:    https://lore.kernel.org/r/20250605091811.386815-1-jth%40kernel.org
patch subject: [PATCH v2] btrfs: zoned: fix alloc_offset calculation for partly conventional block groups
config: i386-buildonly-randconfig-002-20250606 (https://download.01.org/0day-ci/archive/20250606/202506060751.KRci5LHx-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250606/202506060751.KRci5LHx-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/202506060751.KRci5LHx-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: fs/btrfs/zoned.o: in function `btrfs_load_block_group_raid0':
>> fs/btrfs/zoned.c:1531: undefined reference to `__umoddi3'
   ld: fs/btrfs/zoned.o: in function `btrfs_load_block_group_raid10':
   fs/btrfs/zoned.c:1592: undefined reference to `__umoddi3'


vim +1531 fs/btrfs/zoned.c

  1504	
  1505	static int btrfs_load_block_group_raid0(struct btrfs_block_group *bg,
  1506						struct btrfs_chunk_map *map,
  1507						struct zone_info *zone_info,
  1508						unsigned long *active,
  1509						u64 last_alloc)
  1510	{
  1511		struct btrfs_fs_info *fs_info = bg->fs_info;
  1512	
  1513		if ((map->type & BTRFS_BLOCK_GROUP_DATA) && !fs_info->stripe_root) {
  1514			btrfs_err(fs_info, "zoned: data %s needs raid-stripe-tree",
  1515				  btrfs_bg_type_to_raid_name(map->type));
  1516			return -EINVAL;
  1517		}
  1518	
  1519		for (int i = 0; i < map->num_stripes; i++) {
  1520			if (zone_info[i].alloc_offset == WP_MISSING_DEV)
  1521				continue;
  1522	
  1523			if (zone_info[i].alloc_offset == WP_CONVENTIONAL) {
  1524				u64 stripe_nr, full_stripe_nr;
  1525				u64 stripe_offset;
  1526				int stripe_index;
  1527	
  1528				stripe_nr = div64_u64(last_alloc, map->stripe_size);
  1529				stripe_offset = stripe_nr * map->stripe_size;
  1530				full_stripe_nr = div_u64(stripe_nr, map->num_stripes);
> 1531				stripe_index = stripe_nr % map->num_stripes;
  1532	
  1533				zone_info[i].alloc_offset =
  1534					full_stripe_nr * map->stripe_size;
  1535	
  1536				if (stripe_index > i)
  1537					zone_info[i].alloc_offset += map->stripe_size;
  1538				else if (stripe_index == i)
  1539					zone_info[i].alloc_offset +=
  1540						(last_alloc - stripe_offset);
  1541			}
  1542	
  1543			if (test_bit(0, active) != test_bit(i, active)) {
  1544				if (!btrfs_zone_activate(bg))
  1545					return -EIO;
  1546			} else {
  1547				if (test_bit(0, active))
  1548					set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &bg->runtime_flags);
  1549			}
  1550			bg->zone_capacity += zone_info[i].capacity;
  1551			bg->alloc_offset += zone_info[i].alloc_offset;
  1552		}
  1553	
  1554		return 0;
  1555	}
  1556	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki