include/linux/cpuhplock.h

File Facts

System

Linux kernel

Corpus path

include/linux/cpuhplock.h

Extension

.h

Size

1709 bytes

Lines

52

Domain

Core OS

Bucket

Core Kernel Interface

Inferred role

Core OS: implementation source

Status

source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/cleanup.h
• linux/errno.h

Detected Declarations

• struct device
• function cpus_write_lock
• function lockdep_assert_cpus_held
• function lockdep_is_cpus_write_held
• function cpu_hotplug_disable_offlining
• function smp_shutdown_nonboot_cpus

Annotated Snippet

static inline void cpus_write_lock(void) { }
static inline void cpus_write_unlock(void) { }
static inline void cpus_read_lock(void) { }
static inline void cpus_read_unlock(void) { }
static inline int  cpus_read_trylock(void) { return true; }
static inline void lockdep_assert_cpus_held(void) { }
static inline int lockdep_is_cpus_held(void) { return 1; }
static inline int lockdep_is_cpus_write_held(void) { return 1; }
static inline void cpu_hotplug_disable_offlining(void) { }
static inline void cpu_hotplug_disable(void) { }
static inline void cpu_hotplug_enable(void) { }
static inline int remove_cpu(unsigned int cpu) { return -EPERM; }
static inline void smp_shutdown_nonboot_cpus(unsigned int primary_cpu) { }
#endif	/* !CONFIG_HOTPLUG_CPU */

DEFINE_LOCK_GUARD_0(cpus_read_lock, cpus_read_lock(), cpus_read_unlock())

#endif /* _LINUX_CPUHPLOCK_H_ */

Annotation

• Immediate include surface: `linux/cleanup.h`, `linux/errno.h`.
• Detected declarations: `struct device`, `function cpus_write_lock`, `function lockdep_assert_cpus_held`, `function lockdep_is_cpus_write_held`, `function cpu_hotplug_disable_offlining`, `function smp_shutdown_nonboot_cpus`.
• Atlas domain: Core OS / Core Kernel Interface.
• 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.