From: Liu Bo cn.fujitsu.com> Subject: [PATCH] Btrfs: use do_div to avoid compile errors on 32bit box Date: 2011-08-19 09:48:44 GMT (3 hours and 36 minutes ago) When doing div operation of u64 type, we need to be careful and use do_div to avoid compile ERROR on 32bit box: "ERROR: "__udivdi3" [fs/btrfs/btrfs.ko] undefined! make[1]: *** [__modpost] Error 1 Signed-off-by: Liu Bo cn.fujitsu.com> --- fs/btrfs/extent-tree.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 80d6148..9b495ce 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -6796,14 +6796,14 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) index = get_block_group_index(block_group); if (index == 0) { dev_min = 4; - min_free /= 2; + do_div(min_free, 2); } else if (index == 1) { dev_min = 2; } else if (index == 2) { min_free *= 2; } else if (index == 3) { dev_min = fs_devices->rw_devices; - min_free /= dev_min; + do_div(min_free, dev_min); } mutex_lock(&root->fs_info->chunk_mutex); -- 1.6.5.2