Hi Kumar, kernel test robot noticed the following build warnings: [auto build test WARNING on bpf-next/for-next] [also build test WARNING on bpf-next/master linus/master next-20241121] [cannot apply to bpf/master v6.12] [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/Kumar-Kartikeya-Dwivedi/bpf-Refactor-and-rename-resource-management/20241121-140722 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git for-next patch link: https://lore.kernel.org/r/20241121005329.408873-6-memxor%40gmail.com patch subject: [PATCH bpf-next v1 5/7] bpf: Introduce support for bpf_local_irq_{save,restore} config: arc-randconfig-001-20241122 (https://download.01.org/0day-ci/archive/20241122/202411220652.mArtMRmI-lkp@xxxxxxxxx/config) compiler: arc-elf-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241122/202411220652.mArtMRmI-lkp@xxxxxxxxx/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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202411220652.mArtMRmI-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): kernel/bpf/verifier.c: In function 'process_irq_flag': >> kernel/bpf/verifier.c:11964:32: warning: variable 'irq_restore' set but not used [-Wunused-but-set-variable] 11964 | bool irq_save = false, irq_restore = false; | ^~~~~~~~~~~ vim +/irq_restore +11964 kernel/bpf/verifier.c 11959 11960 static int process_irq_flag(struct bpf_verifier_env *env, int regno, 11961 struct bpf_kfunc_call_arg_meta *meta) 11962 { 11963 struct bpf_reg_state *regs = cur_regs(env), *reg = ®s[regno]; 11964 bool irq_save = false, irq_restore = false; 11965 int err; 11966 11967 if (meta->func_id == special_kfunc_list[KF_bpf_local_irq_save]) { 11968 irq_save = true; 11969 } else if (meta->func_id == special_kfunc_list[KF_bpf_local_irq_restore]) { 11970 irq_restore = true; 11971 } else { 11972 verbose(env, "verifier internal error: unknown irq flags kfunc\n"); 11973 return -EFAULT; 11974 } 11975 11976 if (irq_save) { 11977 if (!is_irq_flag_reg_valid_uninit(env, reg)) { 11978 verbose(env, "expected uninitialized irq flag as arg#%d\n", regno); 11979 return -EINVAL; 11980 } 11981 11982 err = check_mem_access(env, env->insn_idx, regno, 0, BPF_DW, BPF_WRITE, -1, false, false); 11983 if (err) 11984 return err; 11985 11986 err = mark_stack_slot_irq_flag(env, meta, reg, env->insn_idx); 11987 if (err) 11988 return err; 11989 } else { 11990 err = is_irq_flag_reg_valid_init(env, reg); 11991 if (err) { 11992 verbose(env, "expected an initialized irq flag as arg#%d\n", regno); 11993 return err; 11994 } 11995 11996 err = mark_irq_flag_read(env, reg); 11997 if (err) 11998 return err; 11999 12000 err = unmark_stack_slot_irq_flag(env, reg); 12001 if (err) 12002 return err; 12003 } 12004 return 0; 12005 } 12006 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
