Prevents the compiler emitting calls to __udivdi3() from libgcc on some
platforms:
WARNING: "__udivdi3" [/shiny/git/btrfs-kernel-unstable/btrfs.ko] undefined!
Signed-off-by: David Woodhouse <David.Woodhouse@xxxxxxxxx>
---
Untested but ObviouslyCorrect™. Now that I can load the module, I hit a
BUG() immediately -- but I don't think it's caused by this patch. qv.
diff --git a/ordered-data.h b/ordered-data.h
index 1794efd..1abe5f5 100644
--- a/ordered-data.h
+++ b/ordered-data.h
@@ -97,9 +97,12 @@ struct btrfs_ordered_extent {
*/
static inline int btrfs_ordered_sum_size(struct btrfs_root *root, u64 bytes)
{
- unsigned long num_sectors = (bytes + root->sectorsize - 1) /
- root->sectorsize;
- num_sectors++;
+ unsigned long num_sectors;
+
+ bytes += root->sectorsize - 1;
+ do_div(bytes, root->sectorsize);
+ num_sectors = bytes + 1;
+
return sizeof(struct btrfs_ordered_sum) +
num_sectors * sizeof(struct btrfs_sector_sum);
}
--
David Woodhouse Open Source Technology Centre
David.Woodhouse@xxxxxxxxx Intel Corporation
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