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Diffstat (limited to 'arch/s390/kernel/vdso64/getcpu.c')
-rw-r--r--arch/s390/kernel/vdso64/getcpu.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/s390/kernel/vdso64/getcpu.c b/arch/s390/kernel/vdso64/getcpu.c
new file mode 100644
index 000000000..5c5d4a848
--- /dev/null
+++ b/arch/s390/kernel/vdso64/getcpu.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright IBM Corp. 2020 */
+
+#include <linux/compiler.h>
+#include <linux/getcpu.h>
+#include <asm/timex.h>
+#include "vdso.h"
+
+int __s390_vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused)
+{
+ union tod_clock clk;
+
+ /* CPU number is stored in the programmable field of the TOD clock */
+ store_tod_clock_ext(&clk);
+ if (cpu)
+ *cpu = clk.pf;
+ /* NUMA node is always zero */
+ if (node)
+ *node = 0;
+ return 0;
+}