LXR linux/tools/testing/selftests/bpf/progs/loop5.c

   1// SPDX-License-Identifier: GPL-2.0
   2// Copyright (c) 2019 Facebook
   3#include <linux/bpf.h>
   4#include <bpf/bpf_helpers.h>
   5#define barrier() __asm__ __volatile__("": : :"memory")
   6
   7char _license[] SEC("license") = "GPL";
   8
   9SEC("socket")
  10int while_true(volatile struct __sk_buff* skb)
  11{
  12        int i = 0;
  13
  14        while (1) {
  15                if (skb->len)
  16                        i += 3;
  17                else
  18                        i += 7;
  19                if (i == 9)
  20                        break;
  21                barrier();
  22                if (i == 10)
  23                        break;
  24                barrier();
  25                if (i == 13)
  26                        break;
  27                barrier();
  28                if (i == 14)
  29                        break;
  30        }
  31        return i;
  32}
  33