[PATCH net-next] mlx4_en: fix a build error on 32bit arches

[Eric Dumazet]

From: Eric Dumazet <edumazet@xxxxxxxxxx>

commit b6c39bfcf1d7d63 ("net/mlx4_en: Add a service task")
added a build error on 32bit arches.

ERROR: "__udivdi3" [drivers/net/ethernet/mellanox/mlx4/mlx4_en.ko]
undefined!

Fix this problem by using do_div()

Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Acked-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Amir Vadai <amirv@xxxxxxxxxxxx>
---
 drivers/net/ethernet/mellanox/mlx4/en_clock.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_clock.c b/drivers/net/ethernet/mellanox/mlx4/en_clock.c
index 2f18121..fd64410 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_clock.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_clock.c
@@ -114,6 +114,7 @@ void mlx4_en_fill_hwtstamps(struct mlx4_en_dev *mdev,
 void mlx4_en_init_timestamp(struct mlx4_en_dev *mdev)
 {
 	struct mlx4_dev *dev = mdev->dev;
+	u64 ns;
 
 	memset(&mdev->cycles, 0, sizeof(mdev->cycles));
 	mdev->cycles.read = mlx4_en_read_clock;
@@ -133,10 +134,9 @@ void mlx4_en_init_timestamp(struct mlx4_en_dev *mdev)
 	/* Calculate period in seconds to call the overflow watchdog - to make
 	 * sure counter is checked at least once every wrap around.
 	 */
-	mdev->overflow_period =
-		(cyclecounter_cyc2ns(&mdev->cycles,
-				    mdev->cycles.mask) / NSEC_PER_SEC / 2)
-		* HZ;
+	ns = cyclecounter_cyc2ns(&mdev->cycles, mdev->cycles.mask);
+	do_div(ns, NSEC_PER_SEC / 2 / HZ);
+	mdev->overflow_period = ns;
 }
 
 void mlx4_en_ptp_overflow_check(struct mlx4_en_dev *mdev)


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