[ovs-dev] [PATCH AUTOSEL 4.19 205/206] net: openvswitch: use div_u64() for 64-by-32 divisions

Sasha Levin sashal at kernel.org
Fri Sep 18 02:08:01 UTC 2020

From: Tonghao Zhang <xiangxia.m.yue at gmail.com>

[ 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 at intel.com>
Signed-off-by: Tonghao Zhang <xiangxia.m.yue at gmail.com>
Tested-by: Tonghao Zhang <xiangxia.m.yue at gmail.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Sasha Levin <sashal at kernel.org>
 net/openvswitch/meter.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/openvswitch/meter.c b/net/openvswitch/meter.c
index 6f5131d1074b0..5ea2471ffc03f 100644
--- a/net/openvswitch/meter.c
+++ b/net/openvswitch/meter.c
@@ -256,7 +256,7 @@ 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;

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