root/tools/testing/selftests/bpf/progs/loop3.c
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019 Facebook
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>

char _license[] SEC("license") = "GPL";

SEC("raw_tracepoint/consume_skb")
int while_true(struct pt_regs *ctx)
{
        volatile __u64 i = 0, sum = 0;
        do {
                i++;
                sum += PT_REGS_RC(ctx);
        } while (i < 0x100000000ULL);
        return sum;
}