arch/riscv/include/asm/fence.h

File Facts

System

Linux kernel

Corpus path

arch/riscv/include/asm/fence.h

Extension

.h

Size

564 bytes

Lines

20

Domain

Architecture Layer

Bucket

arch/riscv

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

• No C-style include directives detected by the generator.

Detected Declarations

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

Annotated Snippet

#ifndef _ASM_RISCV_FENCE_H
#define _ASM_RISCV_FENCE_H

#define RISCV_FENCE_ASM(p, s)		"\tfence " #p "," #s "\n"
#define RISCV_FENCE(p, s) \
	({ __asm__ __volatile__ (RISCV_FENCE_ASM(p, s) : : : "memory"); })

#ifdef CONFIG_SMP
#define RISCV_ACQUIRE_BARRIER		RISCV_FENCE_ASM(r, rw)
#define RISCV_RELEASE_BARRIER		RISCV_FENCE_ASM(rw, w)
#define RISCV_FULL_BARRIER		RISCV_FENCE_ASM(rw, rw)
#else
#define RISCV_ACQUIRE_BARRIER
#define RISCV_RELEASE_BARRIER
#define RISCV_FULL_BARRIER
#endif

#endif	/* _ASM_RISCV_FENCE_H */

Annotation

• Atlas domain: Architecture Layer / arch/riscv.
• 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.