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Date: Sun, 13 Sep 2020 14:33:08 -0700 (PDT) From: David Miller <davem@...emloft.net> To: ttoukan.linux@...il.com Cc: luojiaxing@...wei.com, kuba@...nel.org, 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() From: Tariq Toukan <ttoukan.linux@...il.com> Date: Sun, 13 Sep 2020 13:12:05 +0300 > > > On 9/13/2020 4:22 AM, David Miller wrote: >> From: Luo Jiaxing <luojiaxing@...wei.com> >> 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 <luojiaxing@...wei.com> >> Looks good, applied, thanks. >> > > Hi Luo, > > I didn't get a chance to review it during the weekend. Tariq, what are you even commenting on? Are you responding to this patch which removes a %100 obviously unused variable set, or on the commit mentioned in the Fixes: tag? > The ring_cons local variable is used in line 903: > https://elixir.bootlin.com/linux/v5.9-rc4/source/drivers/net/ethernet/mellanox/mlx4/en_tx.c#L903 He is removing an assignment to ring_cons much later in the function and therefore has no effect on this line. > 1. Your patch causes a degradation to the case when MLX4_EN_PERF_STAT > is defined. This is not true, see above.
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