linux-kernel - Re: [PATCH net-next] net: ethernet: mlx4: Avoid assigning a value to ring_cons but not used it anymore in mlx4_en

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Date:   Mon, 14 Sep 2020 13:02:59 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Tariq Toukan <ttoukan.linux@...il.com>
Cc:     David Miller <davem@...emloft.net>, luojiaxing@...wei.com,
        idos@...lanox.com, ogerlitz@...lanox.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linuxarm@...wei.com
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 Sun, 13 Sep 2020 13:12:05 +0300 Tariq Toukan wrote:
> 2. When MLX4_EN_PERF_STAT is not defined, we should totally remove the 
> local variable declaration, not only its usage.

I was actually wondering about this when working on the pause stat
patch. Where is MLX4_EN_PERF_STAT ever defined?

$ git grep MLX4_EN_PERF_STAT
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h:#ifdef MLX4_EN_PERF_STAT
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h:#endif /* MLX4_EN_PERF_STAT */
drivers/net/ethernet/mellanox/mlx4/mlx4_stats.h:#ifdef MLX4_EN_PERF_STAT