arch/arm64/include/asm/spinlock.h

File Facts

System

Linux kernel

Corpus path

arch/arm64/include/asm/spinlock.h

Extension

.h

Size

601 bytes

Lines

28

Domain

Architecture Layer

Bucket

arch/arm64

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.

Dependency Surface

• asm/qspinlock.h
• asm/qrwlock.h

Detected Declarations

• function Copyright

Annotated Snippet

#ifndef __ASM_SPINLOCK_H
#define __ASM_SPINLOCK_H

#include <asm/qspinlock.h>
#include <asm/qrwlock.h>

/* See include/linux/spinlock.h */
#define smp_mb__after_spinlock()	smp_mb()

/*
 * Changing this will break osq_lock() thanks to the call inside
 * smp_cond_load_relaxed().
 *
 * See:
 * https://lore.kernel.org/lkml/20200110100612.GC2827@hirez.programming.kicks-ass.net
 */
#define vcpu_is_preempted vcpu_is_preempted
static inline bool vcpu_is_preempted(int cpu)
{
	return false;
}

#endif /* __ASM_SPINLOCK_H */

Annotation

• Immediate include surface: `asm/qspinlock.h`, `asm/qrwlock.h`.
• Detected declarations: `function Copyright`.
• Atlas domain: Architecture Layer / arch/arm64.
• 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.