| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 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/time.h> |
| 11 | #include <asm/vgtod.h> |
| 12 | |
| 13 | notrace long |
| 14 | __vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused) |
| 15 | { |
| 16 | unsigned int p; |
| 17 | |
| 18 | p = __getcpu(); |
| 19 | |
| 20 | if (cpu) |
| 21 | *cpu = p & VGETCPU_CPU_MASK; |
| 22 | if (node) |
| 23 | *node = p >> 12; |
| 24 | return 0; |
| 25 | } |
| 26 | |
| 27 | long getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache) |
| 28 | __attribute__((weak, alias("__vdso_getcpu"))); |