linux-kernel - Re: [PATCH net-next] fq_codel: remove set but not used variables 'prev_ecn_mark' and 'prev_drop

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Message-Id: <20190808.223247.493228946898420743.davem@davemloft.net>
Date:   Thu, 08 Aug 2019 22:32:47 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     yuehaibing@...wei.com
Cc:     jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        dave.taht@...il.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next] fq_codel: remove set but not used variables
 'prev_ecn_mark' and 'prev_drop_count'

From: David Miller <davem@...emloft.net>
Date: Thu, 08 Aug 2019 22:31:36 -0700 (PDT)

> From: YueHaibing <yuehaibing@...wei.com>
> Date: Wed, 7 Aug 2019 21:10:55 +0800
> 
>> Fixes gcc '-Wunused-but-set-variable' warning:
>> 
>> net/sched/sch_fq_codel.c: In function fq_codel_dequeue:
>> net/sched/sch_fq_codel.c:288:23: warning: variable prev_ecn_mark set but not used [-Wunused-but-set-variable]
>> net/sched/sch_fq_codel.c:288:6: warning: variable prev_drop_count set but not used [-Wunused-but-set-variable]
>> 
>> They are not used since commit 77ddaff218fc ("fq_codel: Kill
>> useless per-flow dropped statistic")
>> 
>> Reported-by: Hulk Robot <hulkci@...wei.com>
>> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> 
> Do you even compile test this stuff?
> 
>   CC [M]  net/sched/sch_fq_codel.o
> net/sched/sch_fq_codel.c: In function ‘fq_codel_dequeue’:
> net/sched/sch_fq_codel.c:309:42: error: ‘prev_drop_count’ undeclared (first use in this function); did you mean ‘page_ref_count’?

Never mind, this is my fault.

I was build testing the patch on the wrong tree, I'm very sorry.