linux-kernel - Re: [PATCH v1 3/5] LoongArch: BPF: Add bpf_arch_text

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Message-ID: <202506120407.Dqc4kJYr-lkp@intel.com>
Date: Thu, 12 Jun 2025 04:56:41 +0800
From: kernel test robot <lkp@...el.com>
To: Chenghao Duan <duanchenghao@...inos.cn>, loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, Chenghao Duan <duanchenghao@...inos.cn>,
	George Guo <guodongtai@...inos.cn>
Subject: Re: [PATCH v1 3/5] LoongArch: BPF: Add bpf_arch_text_poke support
 for Loongarch

Hi Chenghao,

kernel test robot noticed the following build warnings:

[auto build test WARNING on bpf-next/net]
[also build test WARNING on bpf-next/master bpf/master linus/master v6.16-rc1 next-20250611]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Chenghao-Duan/LoongArch-Support-fixmap/20250611-133843
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git net
patch link:    https://lore.kernel.org/r/20250611053625.352091-4-duanchenghao%40kylinos.cn
patch subject: [PATCH v1 3/5] LoongArch: BPF: Add bpf_arch_text_poke support for Loongarch
config: loongarch-randconfig-002-20250612 (https://download.01.org/0day-ci/archive/20250612/202506120407.Dqc4kJYr-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 12.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250612/202506120407.Dqc4kJYr-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/202506120407.Dqc4kJYr-lkp@intel.com/

All warnings (new ones prefixed by >>):

   arch/loongarch/net/bpf_jit.c: In function 'gen_jump_or_nops':
>> arch/loongarch/net/bpf_jit.c:1380:13: warning: variable 'off' set but not used [-Wunused-but-set-variable]
    1380 |         s64 off = 0;
         |             ^~~


vim +/off +1380 arch/loongarch/net/bpf_jit.c

  1377	
  1378	static int gen_jump_or_nops(void *target, void *ip, u32 *insns, bool is_call)
  1379	{
> 1380		s64 off = 0;
  1381		struct jit_ctx ctx;
  1382	
  1383		ctx.idx = 0;
  1384		ctx.image = (union loongarch_instruction *)insns;
  1385	
  1386		if (!target) {
  1387			emit_insn((&ctx), NOP);
  1388			emit_insn((&ctx), NOP);
  1389			return 0;
  1390		}
  1391	
  1392		off = (s64)(target - ip);
  1393		return emit_jump_and_link(&ctx, is_call ? LOONGARCH_GPR_T0 : LOONGARCH_GPR_ZERO,
  1394						(unsigned long)ip, (unsigned long)target);
  1395	}
  1396	

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