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Date:   Sun, 13 Sep 2020 13:12:05 +0300
From:   Tariq Toukan <>
To:     David Miller <>,
Subject: Re: [PATCH net-next] net: ethernet: mlx4: Avoid assigning a value to
 ring_cons but not used it anymore in mlx4_en_xmit()

On 9/13/2020 4:22 AM, David Miller wrote:
> From: Luo Jiaxing <>
> Date: Sat, 12 Sep 2020 16:08:15 +0800
>> We found a set but not used variable 'ring_cons' in mlx4_en_xmit(), it will
>> cause a warning when build the kernel. And after checking the commit record
>> of this function, we found that it was introduced by a previous patch.
>> So, We delete this redundant assignment code.
>> Fixes: 488a9b48e398 ("net/mlx4_en: Wake TX queues only when there's enough room")
>> Signed-off-by: Luo Jiaxing <>
> Looks good, applied, thanks.

Hi Luo,

I didn't get a chance to review it during the weekend.

The ring_cons local variable is used in line 903:

AVG_PERF_COUNTER depends on the compile-time definition of 
MLX4_EN_PERF_STAT. Otherwise it is a nop.

1. Your patch causes a degradation to the case when MLX4_EN_PERF_STAT is 
2. When MLX4_EN_PERF_STAT is not defined, we should totally remove the 
local variable declaration, not only its usage.

Please let me know if you're planning to fix this. Otherwise I'll do.


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