drivers/cpuidle/coupled.c

File Facts

System

Linux kernel

Corpus path

drivers/cpuidle/coupled.c

Extension

.c

Size

25669 bytes

Lines

785

Domain

Driver Families

Bucket

drivers/cpuidle

Inferred role

Driver Families: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• 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/cpu.h
• linux/cpuidle.h
• linux/mutex.h
• linux/sched.h
• linux/slab.h
• linux/spinlock.h
• cpuidle.h

Detected Declarations

• struct cpuidle_coupled
• function cpuidle_coupled_parallel_barrier
• function cpuidle_state_is_coupled
• function cpuidle_coupled_state_verify
• function cpuidle_coupled_set_ready
• function cpuidle_coupled_set_not_ready
• function cpuidle_coupled_no_cpus_ready
• function cpuidle_coupled_cpus_ready
• function cpuidle_coupled_cpus_waiting
• function cpuidle_coupled_no_cpus_waiting
• function cpuidle_coupled_get_state
• function cpuidle_coupled_handle_poke
• function cpuidle_coupled_poke
• function cpuidle_coupled_poke_others
• function cpuidle_coupled_set_waiting
• function cpuidle_coupled_set_not_waiting
• function cpuidle_coupled_set_done
• function need_resched
• function cpuidle_coupled_any_pokes_pending
• function state
• function cpuidle_coupled_update_online_cpus
• function cpuidle_coupled_register_device
• function for_each_cpu
• function cpuidle_coupled_unregister_device
• function cpuidle_coupled_prevent_idle
• function cpuidle_coupled_allow_idle
• function coupled_cpu_online
• function coupled_cpu_up_prepare
• function cpuidle_coupled_init
• module init cpuidle_coupled_init

Annotated Snippet

core_initcall(cpuidle_coupled_init);

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/cpu.h`, `linux/cpuidle.h`, `linux/mutex.h`, `linux/sched.h`, `linux/slab.h`, `linux/spinlock.h`, `cpuidle.h`.
• Detected declarations: `struct cpuidle_coupled`, `function cpuidle_coupled_parallel_barrier`, `function cpuidle_state_is_coupled`, `function cpuidle_coupled_state_verify`, `function cpuidle_coupled_set_ready`, `function cpuidle_coupled_set_not_ready`, `function cpuidle_coupled_no_cpus_ready`, `function cpuidle_coupled_cpus_ready`, `function cpuidle_coupled_cpus_waiting`, `function cpuidle_coupled_no_cpus_waiting`.
• Atlas domain: Driver Families / drivers/cpuidle.
• 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.