[deliverable/linux.git] / arch / x86 / vdso / 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/jiffies.h>
#include <linux/time.h>
#include <asm/vsyscall.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")));
Commit	Line	Data
2aae950b AK	1	/*
	2	* Copyright 2006 Andi Kleen, SUSE Labs.
	3	* Subject to the GNU Public License, v.2
	4	*
	5	* Fast user context implementation of getcpu()
	6	*/
	7
	8	#include <linux/kernel.h>
	9	#include <linux/getcpu.h>
	10	#include <linux/jiffies.h>
	11	#include <linux/time.h>
	12	#include <asm/vsyscall.h>
	13	#include <asm/vgtod.h>
2aae950b	14
23adec55 SR	15	notrace long
23adec55 SR	16	__vdso_getcpu(unsigned cpu, unsigned node, struct getcpu_cache *unused)
2aae950b	17	{
8f12dea6	18	unsigned int p;
2aae950b	19
51c19b4f MT	20	p = __getcpu();
51c19b4f MT	21
2aae950b	22	if (cpu)
51c19b4f	23	*cpu = p & VGETCPU_CPU_MASK;
2aae950b AK	24	if (node)
	25	*node = p >> 12;
	26	return 0;
	27	}
	28
	29	long getcpu(unsigned cpu, unsigned node, struct getcpu_cache *tcache)
	30	__attribute__((weak, alias("__vdso_getcpu")));