LXR linux/tools/testing/selftests/bpf/progs/test_global

   1// SPDX-License-Identifier: GPL-2.0-only
   2#include <stddef.h>
   3#include <linux/bpf.h>
   4#include <bpf/bpf_helpers.h>
   5
   6__noinline int foo(unsigned int *v)
   7{
   8        if (v)
   9                *v = bpf_get_prandom_u32();
  10
  11        return 0;
  12}
  13
  14SEC("cgroup_skb/ingress")
  15int test_cls(struct __sk_buff *skb)
  16{
  17        unsigned int v = 1;
  18
  19        foo(&v);
  20
  21        return v;
  22}
  23