1// SPDX-License-Identifier: GPL-2.0
2// Copyright (c) 2019 Facebook
3#include <linux/sched.h>
4#include <linux/ptrace.h>
5#include <stdint.h>
6#include <stddef.h>
7#include <stdbool.h>
8#include <linux/bpf.h>
9#include <bpf/bpf_helpers.h>
10#include <bpf/bpf_tracing.h>
11
12char _license[] SEC("license") = "GPL";
13
14SEC("raw_tracepoint/consume_skb")
15int while_true(volatile struct pt_regs* ctx)
16{
17 int i = 0;
18
19 while (true) {
20 if (PT_REGS_RC(ctx) & 1)
21 i += 3;
22 else
23 i += 7;
24 if (i > 40)
25 break;
26 }
27
28 return i;
29}
30

source code of linux/tools/testing/selftests/bpf/progs/loop2.c