linux-kernel - [PATCH] net/mlx5e: use div64

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Message-Id: <20220705195025.3348953-1-jcmvbkbc@gmail.com>
Date:   Tue,  5 Jul 2022 12:50:25 -0700
From:   Max Filippov <jcmvbkbc@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-next@...r.kernel.org, netdev@...r.kernel.org,
        Jianbo Liu <jianbol@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Ariel Levkovich <lariel@...dia.com>,
        Roi Dayan <roid@...dia.com>, Leon Romanovsky <leon@...nel.org>,
        Max Filippov <jcmvbkbc@...il.com>
Subject: [PATCH] net/mlx5e: use div64_u64 for long division

This fixes the following build error on 32-bit architectures visible in
linux-next:

  ERROR: modpost: "__divdi3" [drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.ko] undefined!
  ERROR: modpost: "__udivdi3" [drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.ko] undefined!

Fixes: 6ddac26cf763 ("net/mlx5e: Add support to modify hardware flow meter parameters")
Signed-off-by: Max Filippov <jcmvbkbc@...il.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/tc/meter.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc/meter.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc/meter.c
index 28962b2134c7..81e7fe819017 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc/meter.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc/meter.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
 // Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 
+#include <asm/div64.h>
 #include "lib/aso.h"
 #include "en/tc/post_act.h"
 #include "meter.h"
@@ -61,7 +62,7 @@ mlx5e_flow_meter_cir_calc(u64 cir, u8 *man, u8 *exp)
 		m = cir << e;
 		if ((s64)m < 0) /* overflow */
 			break;
-		m /= MLX5_CONST_CIR;
+		m = div64_u64(m, MLX5_CONST_CIR);
 		if (m > 0xFF) /* man width 8 bit */
 			continue;
 		_cir = MLX5_CALC_CIR(m, e);
-- 
2.30.2