arch/alpha/include/asm/percpu.h

File Facts

System

Linux kernel

Corpus path

arch/alpha/include/asm/percpu.h

Extension

.h

Size

532 bytes

Lines

19

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.

Dependency Surface

• asm-generic/percpu.h

Detected Declarations

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

Annotated Snippet

#ifndef __ALPHA_PERCPU_H
#define __ALPHA_PERCPU_H

/*
 * To calculate addresses of locally defined variables, GCC uses
 * 32-bit displacement from the GP. Which doesn't work for per cpu
 * variables in modules, as an offset to the kernel per cpu area is
 * way above 4G.
 *
 * Always use weak definitions for percpu variables in modules.
 * Therefore, we have enabled CONFIG_ARCH_MODULE_NEEDS_WEAK_PER_CPU
 * in the Kconfig.
 */

#include <asm-generic/percpu.h>

#endif /* __ALPHA_PERCPU_H */

Annotation

• Immediate include surface: `asm-generic/percpu.h`.
• Atlas domain: Architecture Layer / arch/alpha.
• 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.