RET_VOID 2063 kernel/bpf/core.c .ret_type = RET_VOID, RET_VOID 278 kernel/bpf/helpers.c .ret_type = RET_VOID, RET_VOID 295 kernel/bpf/helpers.c .ret_type = RET_VOID, RET_VOID 4090 kernel/bpf/verifier.c } else if (fn->ret_type == RET_VOID) {