linux - arch/s390/kernel/vdso/getcpu.c

20 lines · 426 B

1	// SPDX-License-Identifier: GPL-2.0
2	/* Copyright IBM Corp. 2020 */
3
4	#include <linux/compiler.h>
5	#include <asm/timex.h>
6	#include "vdso.h"
7
8	int __s390_vdso_getcpu(unsigned cpu, unsigned node, void *unused)
9	{
10	union tod_clock clk;
11
12	/* CPU number is stored in the programmable field of the TOD clock */
13	store_tod_clock_ext(&clk);
14	if (cpu)
15	*cpu = clk.pf;
16	/* NUMA node is always zero */
17	if (node)
18	*node = 0;
19	return 0;
20	}