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) 2026 Meta Platforms, Inc. and affiliates. */
3
4#include <vmlinux.h>
5#include <bpf/bpf_helpers.h>
6#include "bpf_misc.h"
7
8extern int bpf_kfunc_implicit_arg(int a) __weak __ksym;
9extern int bpf_kfunc_implicit_arg_impl(int a, struct bpf_prog_aux *aux) __weak __ksym; /* illegal */
10extern int bpf_kfunc_implicit_arg_legacy(int a, int b) __weak __ksym;
11extern int bpf_kfunc_implicit_arg_legacy_impl(int a, int b, struct bpf_prog_aux *aux) __weak __ksym;
12
13char _license[] SEC("license") = "GPL";
14
15SEC("syscall")
16__retval(5)
17int test_kfunc_implicit_arg(void *ctx)
18{
19 return bpf_kfunc_implicit_arg(5);
20}
21
22SEC("syscall")
23__failure __msg("cannot find address for kernel function bpf_kfunc_implicit_arg_impl")
24int test_kfunc_implicit_arg_impl_illegal(void *ctx)
25{
26 return bpf_kfunc_implicit_arg_impl(5, NULL);
27}
28
29SEC("syscall")
30__retval(7)
31int test_kfunc_implicit_arg_legacy(void *ctx)
32{
33 return bpf_kfunc_implicit_arg_legacy(3, 4);
34}
35
36SEC("syscall")
37__retval(11)
38int test_kfunc_implicit_arg_legacy_impl(void *ctx)
39{
40 return bpf_kfunc_implicit_arg_legacy_impl(5, 6, NULL);
41}