linux-kernel - [PATCH 2/2] net: openvswitch: use div

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Date:   Sat, 25 Apr 2020 11:39:48 +0800
From:   xiangxia.m.yue@...il.com
To:     eric.dumazet@...il.com, geert@...ux-m68k.org, pshelar@....org,
        davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tonghao Zhang <xiangxia.m.yue@...il.com>
Subject: [PATCH 2/2] net: openvswitch: use div_u64() for 64-by-32 divisions

From: Tonghao Zhang <xiangxia.m.yue@...il.com>

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@...el.com>
Signed-off-by: Tonghao Zhang <xiangxia.m.yue@...il.com>
Tested-by: Tonghao Zhang <xiangxia.m.yue@...il.com>
---
The author should be:
Geert Uytterhoeven <geert@...ux-m68k.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 612ad5586ce9..3d3d8e094546 100644
--- 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++;
-- 
2.23.0