tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
3#include <vmlinux.h>
4#include <bpf/bpf_helpers.h>
5#include <bpf/bpf_tracing.h>
6#include <bpf/bpf_core_read.h>
7#include "bpf_experimental.h"
8
9struct {
10 __uint(type, BPF_MAP_TYPE_ARENA);
11 __uint(map_flags, BPF_F_MMAPABLE);
12 __uint(max_entries, 100); /* number of pages */
13} arena SEC(".maps");
14
15#include "bpf_arena_htab.h"
16
17void __arena *htab_for_user;
18bool skip = false;
19
20int zero = 0;
21
22SEC("syscall")
23int arena_htab_llvm(void *ctx)
24{
25#if defined(__BPF_FEATURE_ADDR_SPACE_CAST) || defined(BPF_ARENA_FORCE_ASM)
26 struct htab __arena *htab;
27 __u64 i;
28
29 htab = bpf_alloc(sizeof(*htab));
30 cast_kern(htab);
31 htab_init(htab);
32
33 /* first run. No old elems in the table */
34 for (i = zero; i < 1000; i++)
35 htab_update_elem(htab, i, i);
36
37 /* should replace all elems with new ones */
38 for (i = zero; i < 1000; i++)
39 htab_update_elem(htab, i, i);
40 cast_user(htab);
41 htab_for_user = htab;
42#else
43 skip = true;
44#endif
45 return 0;
46}
47
48char _license[] SEC("license") = "GPL";