LXR linux/tools/testing/selftests/bpf/progs/loop1.c

   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/kfree_skb")
  15int nested_loops(volatile struct pt_regs* ctx)
  16{
  17        int i, j, sum = 0, m;
  18
  19        for (j = 0; j < 300; j++)
  20                for (i = 0; i < j; i++) {
  21                        if (j & 1)
  22                                m = PT_REGS_RC(ctx);
  23                        else
  24                                m = j;
  25                        sum += i * m;
  26                }
  27
  28        return sum;
  29}
  30