kernel/ucount.c
Source file repositories/reference/linux-study-clean/kernel/ucount.c
File Facts
- System
- Linux kernel
- Corpus path
kernel/ucount.c- Extension
.c- Size
- 9098 bytes
- Lines
- 363
- Domain
- Core OS
- Bucket
- Scheduler, Processes, Timers, Sync, And Syscalls
- Inferred role
- Core OS: exported/initcall integration point
- Status
- integration 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.
- Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
- 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.
- 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/stat.hlinux/sysctl.hlinux/slab.hlinux/cred.hlinux/hash.hlinux/kmemleak.hlinux/user_namespace.h
Detected Declarations
function set_lookupfunction set_is_seenfunction set_permissionsfunction setup_userns_sysctlsfunction retire_userns_sysctlsfunction hlist_add_ucountsfunction put_ucountsfunction atomic_long_inc_belowfunction dec_ucountfunction inc_rlimit_ucountsfunction dec_rlimit_ucountsfunction do_dec_rlimit_put_ucountsfunction dec_rlimit_put_ucountsfunction inc_rlimit_get_ucountsfunction is_rlimit_overlimitfunction user_namespace_sysctl_initmodule init user_namespace_sysctl_init
Annotated Snippet
subsys_initcall(user_namespace_sysctl_init);Annotation
- Immediate include surface: `linux/stat.h`, `linux/sysctl.h`, `linux/slab.h`, `linux/cred.h`, `linux/hash.h`, `linux/kmemleak.h`, `linux/user_namespace.h`.
- Detected declarations: `function set_lookup`, `function set_is_seen`, `function set_permissions`, `function setup_userns_sysctls`, `function retire_userns_sysctls`, `function hlist_add_ucounts`, `function put_ucounts`, `function atomic_long_inc_below`, `function dec_ucount`, `function inc_rlimit_ucounts`.
- Atlas domain: Core OS / Scheduler, Processes, Timers, Sync, And Syscalls.
- Implementation status: integration 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.