tools/testing/selftests/bpf/progs/kfunc_module_order.c

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/bpf/progs/kfunc_module_order.c

Extension

.c

Size

618 bytes

Lines

31

Domain

Support Tooling And Documentation

Bucket

tools

Inferred role

Support Tooling And Documentation: implementation source

Status

source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/bpf.h
• bpf/bpf_helpers.h

Detected Declarations

• function call_kfunc_xy
• function call_kfunc_yx

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>

extern int bpf_test_modorder_retx(void) __ksym;
extern int bpf_test_modorder_rety(void) __ksym;

SEC("classifier")
int call_kfunc_xy(struct __sk_buff *skb)
{
	int ret1, ret2;

	ret1 = bpf_test_modorder_retx();
	ret2 = bpf_test_modorder_rety();

	return ret1 == 'x' && ret2 == 'y' ? 0 : -1;
}

SEC("classifier")
int call_kfunc_yx(struct __sk_buff *skb)
{
	int ret1, ret2;

	ret1 = bpf_test_modorder_rety();
	ret2 = bpf_test_modorder_retx();

	return ret1 == 'y' && ret2 == 'x' ? 0 : -1;
}

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

Annotation

• Immediate include surface: `linux/bpf.h`, `bpf/bpf_helpers.h`.
• Detected declarations: `function call_kfunc_xy`, `function call_kfunc_yx`.
• Atlas domain: Support Tooling And Documentation / tools.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.