arch/s390/mm/cmm.c

File Facts

System

Linux kernel

Corpus path

arch/s390/mm/cmm.c

Extension

.c

Size

10071 bytes

Lines

448

Domain

Architecture Layer

Bucket

arch/s390

Inferred role

Architecture Layer: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• 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/errno.h
• linux/fs.h
• linux/init.h
• linux/module.h
• linux/moduleparam.h
• linux/gfp.h
• linux/sched.h
• linux/string_helpers.h
• linux/sysctl.h
• linux/swap.h
• linux/kthread.h
• linux/oom.h
• linux/uaccess.h
• asm/diag.h
• ../../../drivers/s390/net/smsgiucv.h

Detected Declarations

• struct cmm_page_array
• function cmm_alloc_pages
• function __cmm_free_pages
• function cmm_free_pages
• function cmm_oom_notify
• function cmm_thread
• function cmm_kick_thread
• function cmm_set_timer
• function cmm_timer_fn
• function cmm_set_pages
• function cmm_get_pages
• function cmm_add_timed_pages
• function cmm_get_timed_pages
• function cmm_set_timeout
• function cmm_skip_blanks
• function cmm_pages_handler
• function cmm_timed_pages_handler
• function cmm_timeout_handler
• function cmm_smsg_target
• function cmm_init
• function cmm_exit
• module init cmm_init

Annotated Snippet

module_init(cmm_init);

static void __exit cmm_exit(void)
{
	unregister_sysctl_table(cmm_sysctl_header);
#ifdef CONFIG_CMM_IUCV
	smsg_unregister_callback(SMSG_PREFIX, cmm_smsg_target);
#endif
	unregister_oom_notifier(&cmm_oom_nb);
	kthread_stop(cmm_thread_ptr);
	timer_delete_sync(&cmm_timer);
	cmm_free_pages(cmm_pages, &cmm_pages, &cmm_page_list);
	cmm_free_pages(cmm_timed_pages, &cmm_timed_pages, &cmm_timed_page_list);
}
module_exit(cmm_exit);

MODULE_DESCRIPTION("Cooperative memory management interface");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/errno.h`, `linux/fs.h`, `linux/init.h`, `linux/module.h`, `linux/moduleparam.h`, `linux/gfp.h`, `linux/sched.h`, `linux/string_helpers.h`.
• Detected declarations: `struct cmm_page_array`, `function cmm_alloc_pages`, `function __cmm_free_pages`, `function cmm_free_pages`, `function cmm_oom_notify`, `function cmm_thread`, `function cmm_kick_thread`, `function cmm_set_timer`, `function cmm_timer_fn`, `function cmm_set_pages`.
• Atlas domain: Architecture Layer / arch/s390.
• 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.