From: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Date: Sat, 25 Apr 2020 03:39:48 +0000 (+0800)
Subject: net: openvswitch: use div_u64() for 64-by-32 divisions
X-Git-Tag: v5.4.69~69
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=765f47c425aa07edc6de4398b923260c6c35cc97;p=users%2Fdwmw2%2Flinux.git

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

[ Upstream commit 659d4587fe7233bfdff303744b20d6f41ad04362 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/net/openvswitch/meter.c b/net/openvswitch/meter.c
index b10734f18bbd6..541eea74ef7a6 100644
--- a/net/openvswitch/meter.c
+++ b/net/openvswitch/meter.c
@@ -252,7 +252,7 @@ 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++;