arch/s390/include/asm/current.h

File Facts

System

Linux kernel

Corpus path

arch/s390/include/asm/current.h

Extension

.h

Size

821 bytes

Lines

36

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

• asm/lowcore.h
• asm/machine.h

Detected Declarations

• struct task_struct

Annotated Snippet

#ifndef _S390_CURRENT_H
#define _S390_CURRENT_H

#include <asm/lowcore.h>
#include <asm/machine.h>

struct task_struct;

static __always_inline struct task_struct *get_current(void)
{
	unsigned long ptr, lc_current;

	lc_current = offsetof(struct lowcore, current_task);
	asm_inline(
		ALTERNATIVE("	lg	%[ptr],%[offzero](%%r0)\n",
			    "	lg	%[ptr],%[offalt](%%r0)\n",
			    ALT_FEATURE(MFEATURE_LOWCORE))
		: [ptr] "=d" (ptr)
		: [offzero] "i" (lc_current),
		  [offalt] "i" (lc_current + LOWCORE_ALT_ADDRESS));
	return (struct task_struct *)ptr;
}

#define current get_current()

#endif /* !(_S390_CURRENT_H) */

Annotation

• Immediate include surface: `asm/lowcore.h`, `asm/machine.h`.
• Detected declarations: `struct task_struct`.
• 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.