selftests/bpf: Convert bpf_iter_test_kern{3, 4}.c to define own bpf_iter_meta

// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2020 Facebook */

#define bpf_iter_meta bpf_iter_meta___not_used

#define bpf_iter__task bpf_iter__task___not_used

#include "vmlinux.h"

#undef bpf_iter_meta

#undef bpf_iter__task

#include <bpf/bpf_helpers.h>

char _license[] SEC("license") = "GPL";

struct bpf_iter_meta {

	struct seq_file *seq;

	__u64 session_id;

	__u64 seq_num;

} __attribute__((preserve_access_index));

struct bpf_iter__task {

	struct bpf_iter_meta *meta;

	struct task_struct *task;

} __attribute__((preserve_access_index));

SEC("iter/task")

int dump_task(struct bpf_iter__task *ctx)

{

// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2020 Facebook */

#define bpf_iter_meta bpf_iter_meta___not_used

#define bpf_iter__bpf_map bpf_iter__bpf_map___not_used

#include "vmlinux.h"

#undef bpf_iter_meta

#undef bpf_iter__bpf_map

#include <bpf/bpf_helpers.h>

char _license[] SEC("license") = "GPL";

struct bpf_iter_meta {

	struct seq_file *seq;

	__u64 session_id;

	__u64 seq_num;

} __attribute__((preserve_access_index));

struct bpf_iter__bpf_map {

	struct bpf_iter_meta *meta;

	struct bpf_map *map;

} __attribute__((preserve_access_index));

__u32 map1_id = 0, map2_id = 0;

__u32 map1_accessed = 0, map2_accessed = 0;

__u64 map1_seqnum = 0, map2_seqnum1 = 0, map2_seqnum2 = 0;