netdev - Re: [PATCH bpf-next v1 1/3] bpf: Allow getting bpf_map from struct

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Message-ID: <202508011701.e7Owy62s-lkp@intel.com>
Date: Fri, 1 Aug 2025 17:31:18 +0800
From: kernel test robot <lkp@...el.com>
To: Amery Hung <ameryhung@...il.com>, bpf@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	netdev@...r.kernel.org, alexei.starovoitov@...il.com,
	andrii@...nel.org, daniel@...earbox.net, tj@...nel.org,
	memxor@...il.com, martin.lau@...nel.org, ameryhung@...il.com,
	kernel-team@...a.com
Subject: Re: [PATCH bpf-next v1 1/3] bpf: Allow getting bpf_map from
 struct_ops kdata

Hi Amery,

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/Amery-Hung/bpf-Allow-getting-bpf_map-from-struct_ops-kdata/20250801-051108
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20250731210950.3927649-2-ameryhung%40gmail.com
patch subject: [PATCH bpf-next v1 1/3] bpf: Allow getting bpf_map from struct_ops kdata
config: arm-randconfig-001-20250801 (https://download.01.org/0day-ci/archive/20250801/202508011701.e7Owy62s-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 8f09b03aebb71c154f3bbe725c29e3f47d37c26e)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250801/202508011701.e7Owy62s-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/202508011701.e7Owy62s-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/bpf/bpf_struct_ops.c:1157:18: warning: unused variable 'map' [-Wunused-variable]
    1157 |         struct bpf_map *map;
         |                         ^~~
   1 warning generated.


vim +/map +1157 kernel/bpf/bpf_struct_ops.c

85d33df357b634 Martin KaFai Lau 2020-01-08  1149  
85d33df357b634 Martin KaFai Lau 2020-01-08  1150  /* "const void *" because some subsystem is
85d33df357b634 Martin KaFai Lau 2020-01-08  1151   * passing a const (e.g. const struct tcp_congestion_ops *)
85d33df357b634 Martin KaFai Lau 2020-01-08  1152   */
eab8366be0bf63 Amery Hung       2025-07-31  1153  struct bpf_map *bpf_struct_ops_get(const void *kdata)
85d33df357b634 Martin KaFai Lau 2020-01-08  1154  {
85d33df357b634 Martin KaFai Lau 2020-01-08  1155  	struct bpf_struct_ops_value *kvalue;
b671c2067a04c0 Kui-Feng Lee     2023-03-22  1156  	struct bpf_struct_ops_map *st_map;
b671c2067a04c0 Kui-Feng Lee     2023-03-22 @1157  	struct bpf_map *map;
85d33df357b634 Martin KaFai Lau 2020-01-08  1158  
85d33df357b634 Martin KaFai Lau 2020-01-08  1159  	kvalue = container_of(kdata, struct bpf_struct_ops_value, data);
b671c2067a04c0 Kui-Feng Lee     2023-03-22  1160  	st_map = container_of(kvalue, struct bpf_struct_ops_map, kvalue);
85d33df357b634 Martin KaFai Lau 2020-01-08  1161  
eab8366be0bf63 Amery Hung       2025-07-31  1162  	return __bpf_map_inc_not_zero(&st_map->map, false);
eb18b49ea758ec Martin KaFai Lau 2021-08-24  1163  }
eab8366be0bf63 Amery Hung       2025-07-31  1164  EXPORT_SYMBOL_GPL(bpf_struct_ops_get);
eb18b49ea758ec Martin KaFai Lau 2021-08-24  1165  

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