arch/alpha/include/asm/barrier.h

File Facts

System

Linux kernel

Corpus path

arch/alpha/include/asm/barrier.h

Extension

.h

Size

507 bytes

Lines

24

Domain

Architecture Layer

Bucket

arch/alpha

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.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.

Dependency Surface

• asm-generic/barrier.h

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

#ifndef __BARRIER_H
#define __BARRIER_H

#define mb()	__asm__ __volatile__("mb": : :"memory")
#define rmb()	__asm__ __volatile__("mb": : :"memory")
#define wmb()	__asm__ __volatile__("wmb": : :"memory")

#define __smp_load_acquire(p)						\
({									\
	compiletime_assert_atomic_type(*p);				\
	__READ_ONCE(*p);						\
})

#ifdef CONFIG_SMP
#define __ASM_SMP_MB	"\tmb\n"
#else
#define __ASM_SMP_MB
#endif

#include <asm-generic/barrier.h>

#endif		/* __BARRIER_H */

Annotation

• Immediate include surface: `asm-generic/barrier.h`.
• Atlas domain: Architecture Layer / arch/alpha.
• Implementation status: source 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.