* Re: [PATCH bpf-next 1/3] bpf: Allow const char * from LSM hooks as kfunc const string arguments
[not found] <20251127005011.1872209-6-song@kernel.org>
@ 2025-11-27 19:07 ` kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2025-11-27 19:07 UTC (permalink / raw)
To: Song Liu, bpf, linux-fsdevel, linux-security-module
Cc: llvm, oe-kbuild-all, ast, daniel, andrii, kernel-team, viro,
brauner, jack, paul, jmorris, serge, Song Liu
Hi Song,
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/Song-Liu/bpf-Allow-const-char-from-LSM-hooks-as-kfunc-const-string-arguments/20251127-125352
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link: https://lore.kernel.org/r/20251127005011.1872209-6-song%40kernel.org
patch subject: [PATCH bpf-next 1/3] bpf: Allow const char * from LSM hooks as kfunc const string arguments
config: loongarch-randconfig-001-20251127 (https://download.01.org/0day-ci/archive/20251128/202511280214.sckLyHDU-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project b3428bb966f1de8aa48375ffee0eba04ede133b7)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251128/202511280214.sckLyHDU-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511280214.sckLyHDU-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> kernel/bpf/verifier.c:9655:14: warning: unused variable 'tname' [-Wunused-variable]
9655 | const char *tname;
| ^~~~~
1 warning generated.
vim +/tname +9655 kernel/bpf/verifier.c
9649
9650 /* Check for const string passed in as input to the bpf program. */
9651 static int check_reg_const_str_arg(struct bpf_reg_state *reg)
9652 {
9653 const struct btf *btf;
9654 const struct btf_type *t;
> 9655 const char *tname;
9656
9657 if (base_type(reg->type) != PTR_TO_BTF_ID)
9658 return -EINVAL;
9659
9660 btf = reg->btf;
9661 t = btf_type_by_id(btf, reg->btf_id);
9662 if (!t)
9663 return -EINVAL;
9664
9665 if (btf_type_is_const_char_ptr(btf, t))
9666 return 0;
9667 return -EINVAL;
9668 }
9669
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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