From: kernel test robot <lkp@intel.com>
To: Eduard Zingerman <eddyz87@gmail.com>
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
0day robot <lkp@intel.com>
Subject: kernel/bpf/liveness.c:371:34: warning: variable 'cnt' set but not used
Date: Sat, 11 Apr 2026 13:35:35 +0200 [thread overview]
Message-ID: <202604111314.SCpV3BPU-lkp@intel.com> (raw)
tree: https://github.com/intel-lab-lkp/linux/commits/Eduard-Zingerman/bpf-share-several-utility-functions-as-internal-API/20260411-114028
head: ad9095e5b6b2e04ae837fa578308a4f7f48fb24e
commit: dc02669dbcd7fae4c4ec1cbcf98f86002d462772 bpf: change logging scheme for live stack analysis
date: 8 hours ago
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260411/202604111314.SCpV3BPU-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260411/202604111314.SCpV3BPU-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/202604111314.SCpV3BPU-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> kernel/bpf/liveness.c:371:34: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
371 | u32 i, frame, po_start, po_end, cnt;
| ^
1 warning generated.
vim +/cnt +371 kernel/bpf/liveness.c
b3698c356ad92b Eduard Zingerman 2025-09-18 367
5c742328a727cd Eduard Zingerman 2026-04-10 368 /* Fixed-point computation of @live_before marks */
5c742328a727cd Eduard Zingerman 2026-04-10 369 static void update_instance(struct bpf_verifier_env *env, struct func_instance *instance)
b3698c356ad92b Eduard Zingerman 2025-09-18 370 {
5c742328a727cd Eduard Zingerman 2026-04-10 @371 u32 i, frame, po_start, po_end, cnt;
b3698c356ad92b Eduard Zingerman 2025-09-18 372 int *insn_postorder = env->cfg.insn_postorder;
b3698c356ad92b Eduard Zingerman 2025-09-18 373 struct bpf_subprog_info *subprog;
b3698c356ad92b Eduard Zingerman 2025-09-18 374 bool changed;
b3698c356ad92b Eduard Zingerman 2025-09-18 375
5c742328a727cd Eduard Zingerman 2026-04-10 376 instance->must_write_initialized = true;
5c742328a727cd Eduard Zingerman 2026-04-10 377 subprog = &env->subprog_info[instance->subprog];
b3698c356ad92b Eduard Zingerman 2025-09-18 378 po_start = subprog->postorder_start;
b3698c356ad92b Eduard Zingerman 2025-09-18 379 po_end = (subprog + 1)->postorder_start;
b3698c356ad92b Eduard Zingerman 2025-09-18 380 cnt = 0;
b3698c356ad92b Eduard Zingerman 2025-09-18 381 /* repeat until fixed point is reached */
b3698c356ad92b Eduard Zingerman 2025-09-18 382 do {
b3698c356ad92b Eduard Zingerman 2025-09-18 383 cnt++;
b3698c356ad92b Eduard Zingerman 2025-09-18 384 changed = false;
5c742328a727cd Eduard Zingerman 2026-04-10 385 for (frame = 0; frame <= instance->depth; frame++) {
b3698c356ad92b Eduard Zingerman 2025-09-18 386 if (!instance->frames[frame])
b3698c356ad92b Eduard Zingerman 2025-09-18 387 continue;
b3698c356ad92b Eduard Zingerman 2025-09-18 388
b3698c356ad92b Eduard Zingerman 2025-09-18 389 for (i = po_start; i < po_end; i++)
b3698c356ad92b Eduard Zingerman 2025-09-18 390 changed |= update_insn(env, instance, frame, insn_postorder[i]);
b3698c356ad92b Eduard Zingerman 2025-09-18 391 }
b3698c356ad92b Eduard Zingerman 2025-09-18 392 } while (changed);
b3698c356ad92b Eduard Zingerman 2025-09-18 393 }
b3698c356ad92b Eduard Zingerman 2025-09-18 394
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
reply other threads:[~2026-04-11 11:36 UTC|newest]
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