1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (c) 2020 Facebook */ 3 #include <stddef.h> 4 #include <linux/bpf.h> 5 #include <bpf/bpf_helpers.h> 6 #include "bpf_misc.h" 7 8 __attribute__ ((noinline)) 9 void foo(struct __sk_buff *skb) 10 { 11 skb->tc_index = 0; 12 } 13 14 SEC("tc") 15 __failure __msg("foo() doesn't return scalar") 16 int global_func7(struct __sk_buff *skb) 17 { 18 foo(skb); 19 return 0; 20 } 21