bpf_kfunc_ret_rcu_test_nostruct
p = bpf_kfunc_ret_rcu_test_nostruct(4);
p = bpf_kfunc_ret_rcu_test_nostruct(4);
BTF_ID_FLAGS(func, bpf_kfunc_ret_rcu_test_nostruct, KF_RET_NULL | KF_RCU_PROTECTED)
int *bpf_kfunc_ret_rcu_test_nostruct(int rdonly_buf_size) __ksym;