arch/s390/kernel/vdso64/getcpu.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright IBM Corp. 2020 */
   3
   4 #include <linux/compiler.h>
   5 #include <linux/getcpu.h>
   6 #include <asm/timex.h>
   7 #include "vdso.h"
   8
   9 int __s390_vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused)
  10 {
  11         __u16 todval[8];
  12
  13         /* CPU number is stored in the programmable field of the TOD clock */
  14         get_tod_clock_ext((char *)todval);
  15         if (cpu)
  16                 *cpu = todval[7];
  17         /* NUMA node is always zero */
  18         if (node)
  19                 *node = 0;
  20         return 0;
  21 }