[PATCH 3.16 81/83] btrfs: partially apply b8b93addde

[Ben Hutchings]

3.16.78-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Hans van Kranenburg <hans@xxxxxxxxxxx>

Extracted from commit b8b93addde "btrfs: cleanup 64bit/32bit divs,
provably bounded values", to allow commits 793ff2c88c6 "btrfs:
volumes: Cleanup stripe size calculation" and baf92114c7 "btrfs:
alloc_chunk: fix more DUP stripe size handling" to apply cleanly.

[bwh: Add patch description]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 fs/btrfs/volumes.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 4aa1a20fc5d7..b4b98a75ca8b 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4274,8 +4274,8 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 	 */
 	if (stripe_size * data_stripes > max_chunk_size) {
 		u64 mask = (1ULL << 24) - 1;
-		stripe_size = max_chunk_size;
-		do_div(stripe_size, data_stripes);
+
+		stripe_size = div_u64(max_chunk_size, data_stripes);
 
 		/* bump the answer up to a 16MB boundary */
 		stripe_size = (stripe_size + mask) & ~mask;