Hi Xu, 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/Xu-Kuohai/bpf-Add-kernel-symbol-for-struct_ops-trampoline/20241030-190704 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master patch link: https://lore.kernel.org/r/20241030111533.907289-1-xukuohai%40huaweicloud.com patch subject: [PATCH bpf-next] bpf: Add kernel symbol for struct_ops trampoline config: arm-randconfig-004-20241031 (https://download.01.org/0day-ci/archive/20241031/202410310549.6S1px0jq-lkp@xxxxxxxxx/config) compiler: arm-linux-gnueabi-gcc (GCC) 14.1.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241031/202410310549.6S1px0jq-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/202410310549.6S1px0jq-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): kernel/bpf/bpf_struct_ops.c: In function 'bpf_struct_ops_map_update_elem': >> kernel/bpf/bpf_struct_ops.c:596:61: warning: '%s' directive output may be truncated writing up to 511 bytes into a region of size 497 [-Wformat-truncation=] 596 | snprintf(ksym->name, KSYM_NAME_LEN, "bpf_trampoline_%s", | ^~ In function 'bpf_struct_ops_ksym_init', inlined from 'bpf_struct_ops_map_update_elem' at kernel/bpf/bpf_struct_ops.c:772:3: kernel/bpf/bpf_struct_ops.c:596:9: note: 'snprintf' output between 16 and 527 bytes into a destination of size 512 596 | snprintf(ksym->name, KSYM_NAME_LEN, "bpf_trampoline_%s", | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 597 | prog->aux->ksym.name); | ~~~~~~~~~~~~~~~~~~~~~ Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for GET_FREE_REGION Depends on [n]: SPARSEMEM [=n] Selected by [m]: - RESOURCE_KUNIT_TEST [=m] && RUNTIME_TESTING_MENU [=y] && KUNIT [=y] vim +596 kernel/bpf/bpf_struct_ops.c 591 592 static void bpf_struct_ops_ksym_init(struct bpf_prog *prog, void *image, 593 unsigned int size, struct bpf_ksym *ksym) 594 { 595 INIT_LIST_HEAD_RCU(&ksym->lnode); > 596 snprintf(ksym->name, KSYM_NAME_LEN, "bpf_trampoline_%s", 597 prog->aux->ksym.name); 598 bpf_image_ksym_init(image, size, ksym); 599 } 600 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
