mlx4_en: fix a build error on 32bit arches

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@infradead.org>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_clock.c b/drivers/net/ethernet/mellanox/mlx4/en_clock.c
index 2f18121..fd64410 100644 (file)
--- 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)