linux-kernel - Re: [PATCH bpf-next v2 05/18] bpf: introduce bpf_gtramp

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Message-ID: <202507041433.Taj70BHu-lkp@intel.com>
Date: Fri, 4 Jul 2025 15:00:27 +0800
From: kernel test robot <lkp@...el.com>
To: Menglong Dong <menglong8.dong@...il.com>, alexei.starovoitov@...il.com,
	rostedt@...dmis.org, jolsa@...nel.org
Cc: oe-kbuild-all@...ts.linux.dev, bpf@...r.kernel.org,
	Menglong Dong <dongml2@...natelecom.cn>,
	John Fastabend <john.fastabend@...il.com>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v2 05/18] bpf: introduce bpf_gtramp_link

Hi Menglong,

kernel test robot noticed the following build warnings:

[auto build test WARNING on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Menglong-Dong/bpf-add-function-hash-table-for-tracing-multi/20250703-203035
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20250703121521.1874196-6-dongml2%40chinatelecom.cn
patch subject: [PATCH bpf-next v2 05/18] bpf: introduce bpf_gtramp_link
config: x86_64-buildonly-randconfig-002-20250704 (https://download.01.org/0day-ci/archive/20250704/202507041433.Taj70BHu-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14+deb12u1) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250704/202507041433.Taj70BHu-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202507041433.Taj70BHu-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/bpf/trampoline.c:36:34: warning: 'bpf_shim_tramp_link_lops' defined but not used [-Wunused-const-variable=]
      36 | static const struct bpf_link_ops bpf_shim_tramp_link_lops;
         |                                  ^~~~~~~~~~~~~~~~~~~~~~~~


vim +/bpf_shim_tramp_link_lops +36 kernel/bpf/trampoline.c

    33	
    34	static struct bpf_global_trampoline global_tr_array[MAX_BPF_FUNC_ARGS + 1];
    35	static DEFINE_MUTEX(global_tr_lock);
  > 36	static const struct bpf_link_ops bpf_shim_tramp_link_lops;
    37	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki