netdev - Re: [PATCH] net/sch_generic.h: use sizeof_member() and get rid of unused variable

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Date:   Tue, 19 May 2020 15:40:19 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     a@...table.cc
Cc:     netdev@...r.kernel.org, cake@...ts.bufferbloat.net, toke@...e.dk,
        jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        stephen@...workplumber.org
Subject: Re: [PATCH] net/sch_generic.h: use sizeof_member() and get rid of
 unused variable

From: Antonio Quartulli <a@...table.cc>
Date: Tue, 19 May 2020 11:13:33 +0200

> Compiling with -Wunused triggers the following warning:
> 
> ./include/net/sch_generic.h: In function ‘qdisc_cb_private_validate’:
> ./include/net/sch_generic.h:464:23: warning: unused variable ‘qcb’ [-Wunused-variable]
>   464 |  struct qdisc_skb_cb *qcb;
>       |                       ^~~
> 
> as the qcb variable is only used to compute the sizeof one of its members.

It's referenced in the code, therefore it is not "unused".

If in some configuration BUILD_BUG_ON() does not reference it's arguments,
that's the bug that needs to be fixed.