2 files changed, 21 insertions, 3 deletions

diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h
index a547817cf1ab..ffdef5fe8587 100644
--- a/arch/s390/include/asm/lowcore.h
+++ b/arch/s390/include/asm/lowcore.h
@@ -106,8 +106,10 @@
 #define __LC_IPLDEV                     0xDB8
 #define __LC_CURRENT                    0xDD8
 #define __LC_INT_CLOCK                  0xDE8
+#define __LC_VDSO_PER_CPU               0xE38
 #endif /* __s390x__ */
 
+#define __LC_PASTE                      0xE40
 
 #define __LC_PANIC_MAGIC                0xE00
 #ifndef __s390x__
@@ -381,7 +383,12 @@ struct _lowcore
         /* whether the kernel died with panic() or not */
         __u32        panic_magic;              /* 0xe00 */
 
-        __u8         pad13[0x11b8-0xe04];      /* 0xe04 */
+        /* Per cpu primary space access list */
+        __u8         pad_0xe04[0xe3c-0xe04];   /* 0xe04 */
+        __u32        vdso_per_cpu_data;        /* 0xe3c */
+        __u32        paste[16];                /* 0xe40 */
+
+        __u8         pad13[0x11b8-0xe80];      /* 0xe80 */
 
         /* 64 bit extparam used for pfault, diag 250 etc  */
         __u64        ext_params2;               /* 0x11B8 */
diff --git a/arch/s390/include/asm/vdso.h b/arch/s390/include/asm/vdso.h
index a44f4fe16a35..7bdd7c8ebc91 100644
--- a/arch/s390/include/asm/vdso.h
+++ b/arch/s390/include/asm/vdso.h
@@ -12,9 +12,9 @@
 #ifndef __ASSEMBLY__
 
 /*
- * Note about this structure:
+ * Note about the vdso_data and vdso_per_cpu_data structures:
  *
- * NEVER USE THIS IN USERSPACE CODE DIRECTLY. The layout of this
+ * NEVER USE THEM IN USERSPACE CODE DIRECTLY. The layout of the
  * structure is supposed to be known only to the function in the vdso
  * itself and may change without notice.
  */
@@ -28,10 +28,21 @@ struct vdso_data {
         __u64 wtom_clock_nsec;          /*                              0x28 */
         __u32 tz_minuteswest;           /* Minutes west of Greenwich    0x30 */
         __u32 tz_dsttime;               /* Type of dst correction       0x34 */
+        __u32 ectg_available;
+};
+
+struct vdso_per_cpu_data {
+        __u64 ectg_timer_base;
+        __u64 ectg_user_time;
 };
 
 extern struct vdso_data *vdso_data;
 
+#ifdef CONFIG_64BIT
+int vdso_alloc_per_cpu(int cpu, struct _lowcore *lowcore);
+void vdso_free_per_cpu(int cpu, struct _lowcore *lowcore);
+#endif
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __KERNEL__ */