// SPDX-License-Identifier: GPL-2.0-only /* Copyright (c) 2020 Facebook */ #include <stddef.h> #include <linux/bpf.h> #include <bpf/bpf_helpers.h> #include "bpf_misc.h" __attribute__ ((noinline)) void foo(struct __sk_buff *skb) { skb->tc_index = 0; } SEC("tc") __failure __msg("foo() doesn't return scalar") int global_func7(struct __sk_buff *skb) { foo(skb); return 0; }