[PATCH 1/2] nilfs2: fix 64-bit division operations in nilfs_bmap_find_target_in_group()

[Jeff Layton]

With the change to make inode->i_ino a u64, the build started failing on
32-bit ARM with:

    ERROR: modpost: "__aeabi_uldivmod" [fs/nilfs2/nilfs2.ko] undefined!

Fix this by using the 64-bit division interfaces in
nilfs_bmap_find_target_in_group().

Fixes: 998a59d371c2 ("treewide: fix missed i_ino format specifier conversions")
Reported-by: kernel test robot <l...@intel.com>
Closes: 
https://lore.kernel.org/oe-kbuild-all/202603100602.kpxiclio-...@intel.com/
Signed-off-by: Jeff Layton <jlay...@kernel.org>
---
 fs/nilfs2/bmap.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/fs/nilfs2/bmap.c b/fs/nilfs2/bmap.c
index 
824f2bd91c167965ec3a660202b6e6c5f1fe007e..4ce9a93149a5af13bc215cc1877a757e2c6cf49b
 100644
--- a/fs/nilfs2/bmap.c
+++ b/fs/nilfs2/bmap.c
@@ -455,11 +455,14 @@ __u64 nilfs_bmap_find_target_in_group(const struct 
nilfs_bmap *bmap)
 {
        struct inode *dat = nilfs_bmap_get_dat(bmap);
        unsigned long entries_per_group = nilfs_palloc_entries_per_group(dat);
-       unsigned long group = bmap->b_inode->i_ino / entries_per_group;
+       unsigned long group;
+       u32 rem;
+
+       group = div_u64(bmap->b_inode->i_ino, entries_per_group);
+       div_u64_rem(bmap->b_inode->i_ino, NILFS_BMAP_GROUP_DIV, &rem);
 
        return group * entries_per_group +
-               (bmap->b_inode->i_ino % NILFS_BMAP_GROUP_DIV) *
-               (entries_per_group / NILFS_BMAP_GROUP_DIV);
+              rem * (entries_per_group / NILFS_BMAP_GROUP_DIV);
 }
 
 static struct lock_class_key nilfs_bmap_dat_lock_key;

-- 
2.53.0