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v0.8.1
https://github.com/torvalds/linux
Raw File
Tip revision: e26081808edadfd257c6c9d81014e3b25e9a6118 authored by Linus Torvalds on 18 May 2015, 17:13:47 UTC
Linux 4.1-rc4
Tip revision: e260818
vgetcpu.c
/*
 * Copyright 2006 Andi Kleen, SUSE Labs.
 * Subject to the GNU Public License, v.2
 *
 * Fast user context implementation of getcpu()
 */

#include <linux/kernel.h>
#include <linux/getcpu.h>
#include <linux/time.h>
#include <asm/vgtod.h>

notrace long
__vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused)
{
	unsigned int p;

	p = __getcpu();

	if (cpu)
		*cpu = p & VGETCPU_CPU_MASK;
	if (node)
		*node = p >> 12;
	return 0;
}

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