net: openvswitch: use div_u64() for 64-by-32 divisions

Compile the kernel for arm 32 platform, the build warning found.
To fix that, should use div_u64() for divisions.
| net/openvswitch/meter.c:396: undefined reference to `__udivdi3'

[add more commit msg, change reported tag, and use div_u64 instead
of do_div by Tonghao]

Fixes: e57358873bb5d6ca ("net: openvswitch: use u64 for meter bucket")
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Tested-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/openvswitch/meter.c b/net/openvswitch/meter.c
index 612ad5586ce9abc74e755e5c72d6d0918f1313e2..3d3d8e0945468193bf37ea81992fa98ae17f2f27 100644 (file)
--- a/net/openvswitch/meter.c
+++ b/net/openvswitch/meter.c
@@ -393,7 +393,7 @@ static struct dp_meter *dp_meter_create(struct nlattr **a)
                 * Start with a full bucket.
                 */
                band->bucket = (band->burst_size + band->rate) * 1000ULL;
-               band_max_delta_t = band->bucket / band->rate;
+               band_max_delta_t = div_u64(band->bucket, band->rate);
                if (band_max_delta_t > meter->max_delta_t)
                        meter->max_delta_t = band_max_delta_t;
                band++;