arch/s390/include/asm/schid.h

File Facts

System

Linux kernel

Corpus path

arch/s390/include/asm/schid.h

Extension

.h

Size

525 bytes

Lines

23

Domain

Architecture Layer

Bucket

arch/s390

Inferred role

Architecture Layer: implementation source

Status

source 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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/string.h
• uapi/asm/schid.h

Detected Declarations

• function init_subchannel_id
• function schid_equal

Annotated Snippet

#ifndef ASM_SCHID_H
#define ASM_SCHID_H

#include <linux/string.h>
#include <uapi/asm/schid.h>

/* Helper function for sane state of pre-allocated subchannel_id. */
static inline void
init_subchannel_id(struct subchannel_id *schid)
{
	memset(schid, 0, sizeof(struct subchannel_id));
	schid->one = 1;
}

static inline int
schid_equal(struct subchannel_id *schid1, struct subchannel_id *schid2)
{
	return !memcmp(schid1, schid2, sizeof(struct subchannel_id));
}

#endif /* ASM_SCHID_H */

Annotation

• Immediate include surface: `linux/string.h`, `uapi/asm/schid.h`.
• Detected declarations: `function init_subchannel_id`, `function schid_equal`.
• Atlas domain: Architecture Layer / arch/s390.
• 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.