kernel/liveupdate/luo_core.c

File Facts

System

Linux kernel

Corpus path

kernel/liveupdate/luo_core.c

Extension

.c

Size

11256 bytes

Lines

443

Domain

Core OS

Bucket

Scheduler, Processes, Timers, Sync, And Syscalls

Inferred role

Core OS: operation-table or driver-model contract

Status

pattern 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 an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/atomic.h
• linux/errno.h
• linux/file.h
• linux/fs.h
• linux/init.h
• linux/io.h
• linux/kernel.h
• linux/kexec_handover.h
• linux/kho/abi/luo.h
• linux/kobject.h
• linux/liveupdate.h
• linux/miscdevice.h
• linux/mm.h
• linux/rwsem.h
• linux/sizes.h
• linux/string.h
• kexec_handover_internal.h
• luo_internal.h

Detected Declarations

• struct luo_device_state
• struct luo_ioctl_op
• function early_liveupdate_param
• function luo_early_startup
• function liveupdate_early_init
• function luo_state_setup
• function luo_late_startup
• function liveupdate_reboot
• function liveupdate_enabled
• function luo_ioctl_create_session
• function luo_ioctl_retrieve_session
• function luo_open
• function luo_release
• function luo_ioctl
• function liveupdate_ioctl_init

Annotated Snippet

static const struct file_operations luo_fops = {
	.owner		= THIS_MODULE,
	.open		= luo_open,
	.release	= luo_release,
	.unlocked_ioctl	= luo_ioctl,
};

static struct luo_device_state luo_dev = {
	.miscdev = {
		.minor = MISC_DYNAMIC_MINOR,
		.name  = "liveupdate",
		.fops  = &luo_fops,
	},
	.in_use = ATOMIC_INIT(0),
};

static int __init liveupdate_ioctl_init(void)
{
	if (!liveupdate_enabled())
		return 0;

	return misc_register(&luo_dev.miscdev);
}
late_initcall(liveupdate_ioctl_init);

Annotation

• Immediate include surface: `linux/atomic.h`, `linux/errno.h`, `linux/file.h`, `linux/fs.h`, `linux/init.h`, `linux/io.h`, `linux/kernel.h`, `linux/kexec_handover.h`.
• Detected declarations: `struct luo_device_state`, `struct luo_ioctl_op`, `function early_liveupdate_param`, `function luo_early_startup`, `function liveupdate_early_init`, `function luo_state_setup`, `function luo_late_startup`, `function liveupdate_reboot`, `function liveupdate_enabled`, `function luo_ioctl_create_session`.
• Atlas domain: Core OS / Scheduler, Processes, Timers, Sync, And Syscalls.
• Implementation status: pattern implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.
• 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.