On Tue, Mar 10, 2026 at 8:44 PM Jeff Layton wrote:
>
> 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 <[email protected]>
> Closes:
> https://lore.kernel.org/oe-kbuild-all/[email protected]/
> Signed-off-by: Jeff Layton <[email protected]>
Acked-by: Ryusuke Konishi <[email protected]>
Thank you. The conversion seems reasonable.
Ryusuke Konishi
> ---
> 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
>
