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1// SPDX-License-Identifier: GPL-2.02/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */3#include <vmlinux.h>4#include <bpf/bpf_tracing.h>5#include "../bpf_testmod/bpf_testmod.h"6 7char _license[] SEC("license") = "GPL";8 9pid_t tgid = 0;10 11/* This is a test BPF program that uses struct_ops to access an argument12 * that may be NULL. This is a test for the verifier to ensure that it can13 * rip PTR_MAYBE_NULL correctly.14 */15SEC("struct_ops/test_maybe_null")16int BPF_PROG(test_maybe_null, int dummy,17 struct task_struct *task)18{19 if (task)20 tgid = task->tgid;21 22 return 0;23}24 25SEC(".struct_ops.link")26struct bpf_testmod_ops testmod_1 = {27 .test_maybe_null = (void *)test_maybe_null,28};29 30