tools/testing/selftests/bpf/progs/loop4.c

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/bpf/progs/loop4.c

Extension

.c

Size

371 bytes

Lines

21

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
• bpf_compiler.h

Detected Declarations

• function combinations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019 Facebook
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>

#include "bpf_compiler.h"

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

SEC("socket")
int combinations(volatile struct __sk_buff* skb)
{
	int ret = 0, i;

	__pragma_loop_no_unroll
	for (i = 0; i < 20; i++)
		if (skb->len)
			ret |= 1 << i;
	return ret;
}

Annotation

• Immediate include surface: `linux/bpf.h`, `bpf/bpf_helpers.h`, `bpf_compiler.h`.
• Detected declarations: `function combinations`.
• 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.