arch/x86/entry/vdso/common/vgetcpu.c

Source file repositories/reference/linux-study-clean/arch/x86/entry/vdso/common/vgetcpu.c

File Facts

System
Linux kernel
Corpus path
arch/x86/entry/vdso/common/vgetcpu.c
Extension
.c
Size
446 bytes
Lines
22
Domain
Architecture Layer
Bucket
arch/x86
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.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2006 Andi Kleen, SUSE Labs.
 *
 * Fast user context implementation of getcpu()
 */

#include <linux/kernel.h>
#include <asm/segment.h>
#include <vdso/processor.h>

notrace long
__vdso_getcpu(unsigned *cpu, unsigned *node, void *unused)
{
	vdso_read_cpunode(cpu, node);

	return 0;
}

long getcpu(unsigned *cpu, unsigned *node, void *tcache)
	__attribute__((weak, alias("__vdso_getcpu")));

Annotation

Implementation Notes