Hi David, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on bpf-next/master] url: https://github.com/intel-lab-lkp/linux/commits/David-Vernet/bpf-Enable-annotating-trusted-nested-pointers/20230120-080139 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master patch link: https://lore.kernel.org/r/20230119235833.2948341-2-void%40manifault.com patch subject: [PATCH bpf-next 1/8] bpf: Enable annotating trusted nested pointers config: x86_64-rhel-8.3-rust (https://download.01.org/0day-ci/archive/20230120/202301201328.KZrjrJXf-lkp@xxxxxxxxx/config) compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/intel-lab-lkp/linux/commit/8f6df14342b1be3516f8e21037edf771df851427 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review David-Vernet/bpf-Enable-annotating-trusted-nested-pointers/20230120-080139 git checkout 8f6df14342b1be3516f8e21037edf771df851427 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/bpf/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> kernel/bpf/btf.c:533:5: warning: no previous prototype for function 'bpf_find_btf_id' [-Wmissing-prototypes] s32 bpf_find_btf_id(const char *name, u32 kind, struct btf **btf_p) ^ kernel/bpf/btf.c:533:1: note: declare 'static' if the function is not intended to be used outside of this translation unit s32 bpf_find_btf_id(const char *name, u32 kind, struct btf **btf_p) ^ static 1 warning generated. vim +/bpf_find_btf_id +533 kernel/bpf/btf.c 532 > 533 s32 bpf_find_btf_id(const char *name, u32 kind, struct btf **btf_p) 534 { 535 struct btf *btf; 536 s32 ret; 537 int id; 538 539 btf = bpf_get_btf_vmlinux(); 540 if (IS_ERR(btf)) 541 return PTR_ERR(btf); 542 if (!btf) 543 return -EINVAL; 544 545 ret = btf_find_by_name_kind(btf, name, kind); 546 /* ret is never zero, since btf_find_by_name_kind returns 547 * positive btf_id or negative error. 548 */ 549 if (ret > 0) { 550 btf_get(btf); 551 *btf_p = btf; 552 return ret; 553 } 554 555 /* If name is not found in vmlinux's BTF then search in module's BTFs */ 556 spin_lock_bh(&btf_idr_lock); 557 idr_for_each_entry(&btf_idr, btf, id) { 558 if (!btf_is_module(btf)) 559 continue; 560 /* linear search could be slow hence unlock/lock 561 * the IDR to avoiding holding it for too long 562 */ 563 btf_get(btf); 564 spin_unlock_bh(&btf_idr_lock); 565 ret = btf_find_by_name_kind(btf, name, kind); 566 if (ret > 0) { 567 *btf_p = btf; 568 return ret; 569 } 570 spin_lock_bh(&btf_idr_lock); 571 btf_put(btf); 572 } 573 spin_unlock_bh(&btf_idr_lock); 574 return ret; 575 } 576 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
