linux-kernel - [congwang:sch_bpf2 2/2] net/sched/sch_bpf.c:90:13: error: unused variable 'bpf

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Date:   Sun, 12 Sep 2021 17:04:18 +0800
From:   kernel test robot <lkp@...el.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [congwang:sch_bpf2 2/2] net/sched/sch_bpf.c:90:13: error: unused
 variable 'bpf_flags'

tree:   https://github.com/congwang/linux.git sch_bpf2
head:   470563412d91de9179d50b7f311a39f1a46321ab
commit: 470563412d91de9179d50b7f311a39f1a46321ab [2/2] net_sched: introduce eBPF based Qdisc
config: arm-randconfig-r033-20210912 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/congwang/linux/commit/470563412d91de9179d50b7f311a39f1a46321ab
        git remote add congwang https://github.com/congwang/linux.git
        git fetch --no-tags congwang sch_bpf2
        git checkout 470563412d91de9179d50b7f311a39f1a46321ab
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   net/sched/sch_bpf.c: In function 'sch_bpf_dump':
>> net/sched/sch_bpf.c:90:13: error: unused variable 'bpf_flags' [-Werror=unused-variable]
      90 |         u32 bpf_flags = 0;
         |             ^~~~~~~~~
   net/sched/sch_bpf.c: In function 'sch_bpf_dump_class_stats':
>> net/sched/sch_bpf.c:535:31: error: unused variable 'q' [-Werror=unused-variable]
     535 |         struct sch_bpf_qdisc *q = qdisc_priv(sch);
         |                               ^
   cc1: all warnings being treated as errors


vim +/bpf_flags +90 net/sched/sch_bpf.c

    85	
    86	static int sch_bpf_dump(struct Qdisc *sch, struct sk_buff *skb)
    87	{
    88		struct sch_bpf_qdisc *q = qdisc_priv(sch);
    89		struct nlattr *opts;
  > 90		u32 bpf_flags = 0;
    91	
    92		opts = nla_nest_start_noflag(skb, TCA_OPTIONS);
    93		if (!opts)
    94			goto nla_put_failure;
    95	
    96		if (nla_put_u32(skb, TCA_SCH_BPF_MODE, q->mode))
    97			goto nla_put_failure;
    98	
    99		if (sch_bpf_dump_prog(&q->enqueue_prog, skb, TCA_SCH_BPF_ENQUEUE_PROG_NAME,
   100				      TCA_SCH_BPF_ENQUEUE_PROG_ID, TCA_SCH_BPF_ENQUEUE_PROG_TAG))
   101			goto nla_put_failure;
   102		if (sch_bpf_dump_prog(&q->dequeue_prog, skb, TCA_SCH_BPF_DEQUEUE_PROG_NAME,
   103				      TCA_SCH_BPF_DEQUEUE_PROG_ID, TCA_SCH_BPF_DEQUEUE_PROG_TAG))
   104			goto nla_put_failure;
   105	
   106		return nla_nest_end(skb, opts);
   107	
   108	nla_put_failure:
   109		return -1;
   110	}
   111	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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