lib/test_lockup.c

File Facts

System

Linux kernel

Corpus path

lib/test_lockup.c

Extension

.c

Size

16848 bytes

Lines

621

Domain

Kernel Services

Bucket

lib

Inferred role

Kernel Services: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

• Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/kernel.h
• linux/module.h
• linux/delay.h
• linux/sched.h
• linux/sched/signal.h
• linux/sched/clock.h
• linux/cpu.h
• linux/nmi.h
• linux/mm.h
• linux/uaccess.h
• linux/file.h

Detected Declarations

• function test_lock
• function test_unlock
• function test_alloc_pages
• function test_free_pages
• function test_wait
• function test_lockup
• function test_work_fn
• function test_kernel_ptr
• function access_ok
• function test_magic
• function test_lockup_init
• function for_each_online_cpu
• module init test_lockup_init

Annotated Snippet

module_init(test_lockup_init);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Konstantin Khlebnikov <khlebnikov@yandex-team.ru>");
MODULE_DESCRIPTION("Test module to generate lockups");

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/module.h`, `linux/delay.h`, `linux/sched.h`, `linux/sched/signal.h`, `linux/sched/clock.h`, `linux/cpu.h`, `linux/nmi.h`.
• Detected declarations: `function test_lock`, `function test_unlock`, `function test_alloc_pages`, `function test_free_pages`, `function test_wait`, `function test_lockup`, `function test_work_fn`, `function test_kernel_ptr`, `function access_ok`, `function test_magic`.
• Atlas domain: Kernel Services / lib.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

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.