Hi Leon, kernel test robot noticed the following build errors:
[auto build test ERROR on bpf-next/master] url: https://github.com/intel-lab-lkp/linux/commits/Leon-Hwang/bpf-x64-Call-perf_snapshot_branch_stack-in-trampoline/20260109-234435 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master patch link: https://lore.kernel.org/r/20260109153420.32181-3-leon.hwang%40linux.dev patch subject: [PATCH bpf-next 2/3] bpf: Introduce BPF_BRANCH_SNAPSHOT_F_COPY flag for bpf_get_branch_snapshot helper config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260112/[email protected]/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/20260112/[email protected]/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 <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ All errors (new ones prefixed by >>): >> ld.lld: error: undefined symbol: bpf_branch_snapshot >>> referenced by bpf_trace.c:1182 (kernel/trace/bpf_trace.c:1182) >>> vmlinux.o:(bpf_get_branch_snapshot) >>> referenced by bpf_trace.c:0 (kernel/trace/bpf_trace.c:0) >>> vmlinux.o:(bpf_get_branch_snapshot) -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
