1 files changed, 262 insertions, 224 deletions

diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index 75a6e62ea973..2fb36e462194 100644
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -23,19 +23,43 @@
 #include <asm/s390_ext.h>
 #include <asm/timer.h>
 #include <asm/irq_regs.h>
+#include <asm/cpu.h>
 
 static ext_int_info_t ext_int_info_timer;
+
 static DEFINE_PER_CPU(struct vtimer_queue, virt_cpu_timer);
 
+DEFINE_PER_CPU(struct s390_idle_data, s390_idle) = {
+        .lock = __SPIN_LOCK_UNLOCKED(s390_idle.lock)
+};
+
+static inline __u64 get_vtimer(void)
+{
+        __u64 timer;
+
+        asm volatile("STPT %0" : "=m" (timer));
+        return timer;
+}
+
+static inline void set_vtimer(__u64 expires)
+{
+        __u64 timer;
+
+        asm volatile ("  STPT %0\n"  /* Store current cpu timer value */
+                      "  SPT %1"     /* Set new value immediatly afterwards */
+                      : "=m" (timer) : "m" (expires) );
+        S390_lowcore.system_timer += S390_lowcore.last_update_timer - timer;
+        S390_lowcore.last_update_timer = expires;
+}
+
 /*
  * Update process times based on virtual cpu times stored by entry.S
  * to the lowcore fields user_timer, system_timer & steal_clock.
  */
-void account_process_tick(struct task_struct *tsk, int user_tick)
+static void do_account_vtime(struct task_struct *tsk, int hardirq_offset)
 {
-        cputime_t cputime;
-        __u64 timer, clock;
-        int rcu_user_flag;
+        struct thread_info *ti = task_thread_info(tsk);
+        __u64 timer, clock, user, system, steal;
 
         timer = S390_lowcore.last_update_timer;
         clock = S390_lowcore.last_update_clock;
@@ -44,50 +68,41 @@ void account_process_tick(struct task_struct *tsk, int user_tick)
                       : "=m" (S390_lowcore.last_update_timer),
                         "=m" (S390_lowcore.last_update_clock) );
         S390_lowcore.system_timer += timer - S390_lowcore.last_update_timer;
-        S390_lowcore.steal_clock += S390_lowcore.last_update_clock - clock;
-
-        cputime = S390_lowcore.user_timer >> 12;
-        rcu_user_flag = cputime != 0;
-        S390_lowcore.user_timer -= cputime << 12;
-        S390_lowcore.steal_clock -= cputime << 12;
-        account_user_time(tsk, cputime);
-
-        cputime =  S390_lowcore.system_timer >> 12;
-        S390_lowcore.system_timer -= cputime << 12;
-        S390_lowcore.steal_clock -= cputime << 12;
-        account_system_time(tsk, HARDIRQ_OFFSET, cputime);
-
-        cputime = S390_lowcore.steal_clock;
-        if ((__s64) cputime > 0) {
-                cputime >>= 12;
-                S390_lowcore.steal_clock -= cputime << 12;
-                account_steal_time(tsk, cputime);
+        S390_lowcore.steal_timer += S390_lowcore.last_update_clock - clock;
+
+        user = S390_lowcore.user_timer - ti->user_timer;
+        S390_lowcore.steal_timer -= user;
+        ti->user_timer = S390_lowcore.user_timer;
+        account_user_time(tsk, user, user);
+
+        system = S390_lowcore.system_timer - ti->system_timer;
+        S390_lowcore.steal_timer -= system;
+        ti->system_timer = S390_lowcore.system_timer;
+        account_system_time(tsk, hardirq_offset, system, system);
+
+        steal = S390_lowcore.steal_timer;
+        if ((s64) steal > 0) {
+                S390_lowcore.steal_timer = 0;
+                account_steal_time(steal);
         }
 }
 
-/*
- * Update process times based on virtual cpu times stored by entry.S
- * to the lowcore fields user_timer, system_timer & steal_clock.
- */
-void account_vtime(struct task_struct *tsk)
+void account_vtime(struct task_struct *prev, struct task_struct *next)
 {
-        cputime_t cputime;
-        __u64 timer;
-
-        timer = S390_lowcore.last_update_timer;
-        asm volatile ("  STPT %0"    /* Store current cpu timer value */
-                      : "=m" (S390_lowcore.last_update_timer) );
-        S390_lowcore.system_timer += timer - S390_lowcore.last_update_timer;
-
-        cputime = S390_lowcore.user_timer >> 12;
-        S390_lowcore.user_timer -= cputime << 12;
-        S390_lowcore.steal_clock -= cputime << 12;
-        account_user_time(tsk, cputime);
+        struct thread_info *ti;
+
+        do_account_vtime(prev, 0);
+        ti = task_thread_info(prev);
+        ti->user_timer = S390_lowcore.user_timer;
+        ti->system_timer = S390_lowcore.system_timer;
+        ti = task_thread_info(next);
+        S390_lowcore.user_timer = ti->user_timer;
+        S390_lowcore.system_timer = ti->system_timer;
+}
 
-        cputime =  S390_lowcore.system_timer >> 12;
-        S390_lowcore.system_timer -= cputime << 12;
-        S390_lowcore.steal_clock -= cputime << 12;
-        account_system_time(tsk, 0, cputime);
+void account_process_tick(struct task_struct *tsk, int user_tick)
+{
+        do_account_vtime(tsk, HARDIRQ_OFFSET);
 }
 
 /*
@@ -96,80 +111,131 @@ void account_vtime(struct task_struct *tsk)
  */
 void account_system_vtime(struct task_struct *tsk)
 {
-        cputime_t cputime;
-        __u64 timer;
+        struct thread_info *ti = task_thread_info(tsk);
+        __u64 timer, system;
 
         timer = S390_lowcore.last_update_timer;
-        asm volatile ("  STPT %0"    /* Store current cpu timer value */
-                      : "=m" (S390_lowcore.last_update_timer) );
+        S390_lowcore.last_update_timer = get_vtimer();
         S390_lowcore.system_timer += timer - S390_lowcore.last_update_timer;
 
-        cputime =  S390_lowcore.system_timer >> 12;
-        S390_lowcore.system_timer -= cputime << 12;
-        S390_lowcore.steal_clock -= cputime << 12;
-        account_system_time(tsk, 0, cputime);
+        system = S390_lowcore.system_timer - ti->system_timer;
+        S390_lowcore.steal_timer -= system;
+        ti->system_timer = S390_lowcore.system_timer;
+        account_system_time(tsk, 0, system, system);
 }
 EXPORT_SYMBOL_GPL(account_system_vtime);
 
-static inline void set_vtimer(__u64 expires)
-{
-        __u64 timer;
-
-        asm volatile ("  STPT %0\n"  /* Store current cpu timer value */
-                      "  SPT %1"     /* Set new value immediatly afterwards */
-                      : "=m" (timer) : "m" (expires) );
-        S390_lowcore.system_timer += S390_lowcore.last_update_timer - timer;
-        S390_lowcore.last_update_timer = expires;
-
-        /* store expire time for this CPU timer */
-        __get_cpu_var(virt_cpu_timer).to_expire = expires;
-}
-
-void vtime_start_cpu_timer(void)
+void vtime_start_cpu(void)
 {
-        struct vtimer_queue *vt_list;
-
-        vt_list = &__get_cpu_var(virt_cpu_timer);
-
-        /* CPU timer interrupt is pending, don't reprogramm it */
-        if (vt_list->idle & 1LL<<63)
-                return;
+        struct s390_idle_data *idle = &__get_cpu_var(s390_idle);
+        struct vtimer_queue *vq = &__get_cpu_var(virt_cpu_timer);
+        __u64 idle_time, expires;
+
+        /* Account time spent with enabled wait psw loaded as idle time. */
+        idle_time = S390_lowcore.int_clock - idle->idle_enter;
+        account_idle_time(idle_time);
+        S390_lowcore.last_update_clock = S390_lowcore.int_clock;
+
+        /* Account system time spent going idle. */
+        S390_lowcore.system_timer += S390_lowcore.last_update_timer - vq->idle;
+        S390_lowcore.last_update_timer = S390_lowcore.async_enter_timer;
+
+        /* Restart vtime CPU timer */
+        if (vq->do_spt) {
+                /* Program old expire value but first save progress. */
+                expires = vq->idle - S390_lowcore.async_enter_timer;
+                expires += get_vtimer();
+                set_vtimer(expires);
+        } else {
+                /* Don't account the CPU timer delta while the cpu was idle. */
+                vq->elapsed -= vq->idle - S390_lowcore.async_enter_timer;
+        }
 
-        if (!list_empty(&vt_list->list))
-                set_vtimer(vt_list->idle);
+        spin_lock(&idle->lock);
+        idle->idle_time += idle_time;
+        idle->idle_enter = 0ULL;
+        idle->idle_count++;
+        spin_unlock(&idle->lock);
 }
 
-void vtime_stop_cpu_timer(void)
+void vtime_stop_cpu(void)
 {
-        struct vtimer_queue *vt_list;
-
-        vt_list = &__get_cpu_var(virt_cpu_timer);
-
-        /* nothing to do */
-        if (list_empty(&vt_list->list)) {
-                vt_list->idle = VTIMER_MAX_SLICE;
-                goto fire;
+        struct s390_idle_data *idle = &__get_cpu_var(s390_idle);
+        struct vtimer_queue *vq = &__get_cpu_var(virt_cpu_timer);
+        psw_t psw;
+
+        /* Wait for external, I/O or machine check interrupt. */
+        psw.mask = psw_kernel_bits | PSW_MASK_WAIT | PSW_MASK_IO | PSW_MASK_EXT;
+
+        /* Check if the CPU timer needs to be reprogrammed. */
+        if (vq->do_spt) {
+                __u64 vmax = VTIMER_MAX_SLICE;
+                /*
+                 * The inline assembly is equivalent to
+                 *      vq->idle = get_cpu_timer();
+                 *      set_cpu_timer(VTIMER_MAX_SLICE);
+                 *      idle->idle_enter = get_clock();
+                 *      __load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT |
+                 *                         PSW_MASK_IO | PSW_MASK_EXT);
+                 * The difference is that the inline assembly makes sure that
+                 * the last three instruction are stpt, stck and lpsw in that
+                 * order. This is done to increase the precision.
+                 */
+                asm volatile(
+#ifndef CONFIG_64BIT
+                        "       basr    1,0\n"
+                        "0:     ahi     1,1f-0b\n"
+                        "       st      1,4(%2)\n"
+#else /* CONFIG_64BIT */
+                        "       larl    1,1f\n"
+                        "       stg     1,8(%2)\n"
+#endif /* CONFIG_64BIT */
+                        "       stpt    0(%4)\n"
+                        "       spt     0(%5)\n"
+                        "       stck    0(%3)\n"
+#ifndef CONFIG_64BIT
+                        "       lpsw    0(%2)\n"
+#else /* CONFIG_64BIT */
+                        "       lpswe   0(%2)\n"
+#endif /* CONFIG_64BIT */
+                        "1:"
+                        : "=m" (idle->idle_enter), "=m" (vq->idle)
+                        : "a" (&psw), "a" (&idle->idle_enter),
+                          "a" (&vq->idle), "a" (&vmax), "m" (vmax), "m" (psw)
+                        : "memory", "cc", "1");
+        } else {
+                /*
+                 * The inline assembly is equivalent to
+                 *      vq->idle = get_cpu_timer();
+                 *      idle->idle_enter = get_clock();
+                 *      __load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT |
+                 *                         PSW_MASK_IO | PSW_MASK_EXT);
+                 * The difference is that the inline assembly makes sure that
+                 * the last three instruction are stpt, stck and lpsw in that
+                 * order. This is done to increase the precision.
+                 */
+                asm volatile(
+#ifndef CONFIG_64BIT
+                        "       basr    1,0\n"
+                        "0:     ahi     1,1f-0b\n"
+                        "       st      1,4(%2)\n"
+#else /* CONFIG_64BIT */
+                        "       larl    1,1f\n"
+                        "       stg     1,8(%2)\n"
+#endif /* CONFIG_64BIT */
+                        "       stpt    0(%4)\n"
+                        "       stck    0(%3)\n"
+#ifndef CONFIG_64BIT
+                        "       lpsw    0(%2)\n"
+#else /* CONFIG_64BIT */
+                        "       lpswe   0(%2)\n"
+#endif /* CONFIG_64BIT */
+                        "1:"
+                        : "=m" (idle->idle_enter), "=m" (vq->idle)
+                        : "a" (&psw), "a" (&idle->idle_enter),
+                          "a" (&vq->idle), "m" (psw)
+                        : "memory", "cc", "1");
         }
-
-        /* store the actual expire value */
-        asm volatile ("STPT %0" : "=m" (vt_list->idle));
-
-        /*
-         * If the CPU timer is negative we don't reprogramm
-         * it because we will get instantly an interrupt.
-         */
-        if (vt_list->idle & 1LL<<63)
-                return;
-
-        vt_list->offset += vt_list->to_expire - vt_list->idle;
-
-        /*
-         * We cannot halt the CPU timer, we just write a value that
-         * nearly never expires (only after 71 years) and re-write
-         * the stored expire value if we continue the timer
-         */
- fire:
-        set_vtimer(VTIMER_MAX_SLICE);
 }
 
 /*
@@ -195,30 +261,23 @@ static void list_add_sorted(struct vtimer_list *timer, struct list_head *head)
  */
 static void do_callbacks(struct list_head *cb_list)
 {
-        struct vtimer_queue *vt_list;
+        struct vtimer_queue *vq;
         struct vtimer_list *event, *tmp;
-        void (*fn)(unsigned long);
-        unsigned long data;
 
         if (list_empty(cb_list))
                 return;
 
-        vt_list = &__get_cpu_var(virt_cpu_timer);
+        vq = &__get_cpu_var(virt_cpu_timer);
 
         list_for_each_entry_safe(event, tmp, cb_list, entry) {
-                fn = event->function;
-                data = event->data;
-                fn(data);
-
-                if (!event->interval)
-                        /* delete one shot timer */
-                        list_del_init(&event->entry);
-                else {
-                        /* move interval timer back to list */
-                        spin_lock(&vt_list->lock);
-                        list_del_init(&event->entry);
-                        list_add_sorted(event, &vt_list->list);
-                        spin_unlock(&vt_list->lock);
+                list_del_init(&event->entry);
+                (event->function)(event->data);
+                if (event->interval) {
+                        /* Recharge interval timer */
+                        event->expires = event->interval + vq->elapsed;
+                        spin_lock(&vq->lock);
+                        list_add_sorted(event, &vq->list);
+                        spin_unlock(&vq->lock);
                 }
         }
 }
@@ -228,64 +287,57 @@ static void do_callbacks(struct list_head *cb_list)
  */
 static void do_cpu_timer_interrupt(__u16 error_code)
 {
-        __u64 next, delta;
-        struct vtimer_queue *vt_list;
+        struct vtimer_queue *vq;
         struct vtimer_list *event, *tmp;
-        struct list_head *ptr;
-        /* the callback queue */
-        struct list_head cb_list;
+        struct list_head cb_list;       /* the callback queue */
+        __u64 elapsed, next;
 
         INIT_LIST_HEAD(&cb_list);
-        vt_list = &__get_cpu_var(virt_cpu_timer);
+        vq = &__get_cpu_var(virt_cpu_timer);
 
         /* walk timer list, fire all expired events */
-        spin_lock(&vt_list->lock);
-
-        if (vt_list->to_expire < VTIMER_MAX_SLICE)
-                vt_list->offset += vt_list->to_expire;
-
-        list_for_each_entry_safe(event, tmp, &vt_list->list, entry) {
-                if (event->expires > vt_list->offset)
-                        /* found first unexpired event, leave */
-                        break;
-
-                /* re-charge interval timer, we have to add the offset */
-                if (event->interval)
-                        event->expires = event->interval + vt_list->offset;
-
-                /* move expired timer to the callback queue */
-                list_move_tail(&event->entry, &cb_list);
+        spin_lock(&vq->lock);
+
+        elapsed = vq->elapsed + (vq->timer - S390_lowcore.async_enter_timer);
+        BUG_ON((s64) elapsed < 0);
+        vq->elapsed = 0;
+        list_for_each_entry_safe(event, tmp, &vq->list, entry) {
+                if (event->expires < elapsed)
+                        /* move expired timer to the callback queue */
+                        list_move_tail(&event->entry, &cb_list);
+                else
+                        event->expires -= elapsed;
         }
-        spin_unlock(&vt_list->lock);
+        spin_unlock(&vq->lock);
+
+        vq->do_spt = list_empty(&cb_list);
         do_callbacks(&cb_list);
 
         /* next event is first in list */
-        spin_lock(&vt_list->lock);
-        if (!list_empty(&vt_list->list)) {
-                ptr = vt_list->list.next;
-                event = list_entry(ptr, struct vtimer_list, entry);
-                next = event->expires - vt_list->offset;
-
-                /* add the expired time from this interrupt handler
-                 * and the callback functions
-                 */
-                asm volatile ("STPT %0" : "=m" (delta));
-                delta = 0xffffffffffffffffLL - delta + 1;
-                vt_list->offset += delta;
-                next -= delta;
-        } else {
-                vt_list->offset = 0;
-                next = VTIMER_MAX_SLICE;
-        }
-        spin_unlock(&vt_list->lock);
-        set_vtimer(next);
+        next = VTIMER_MAX_SLICE;
+        spin_lock(&vq->lock);
+        if (!list_empty(&vq->list)) {
+                event = list_first_entry(&vq->list, struct vtimer_list, entry);
+                next = event->expires;
+        } else
+                vq->do_spt = 0;
+        spin_unlock(&vq->lock);
+        /*
+         * To improve precision add the time spent by the
+         * interrupt handler to the elapsed time.
+         * Note: CPU timer counts down and we got an interrupt,
+         *       the current content is negative
+         */
+        elapsed = S390_lowcore.async_enter_timer - get_vtimer();
+        set_vtimer(next - elapsed);
+        vq->timer = next - elapsed;
+        vq->elapsed = elapsed;
 }
 
 void init_virt_timer(struct vtimer_list *timer)
 {
         timer->function = NULL;
         INIT_LIST_HEAD(&timer->entry);
-        spin_lock_init(&timer->lock);
 }
 EXPORT_SYMBOL(init_virt_timer);
 
@@ -299,44 +351,40 @@ static inline int vtimer_pending(struct vtimer_list *timer)
  */
 static void internal_add_vtimer(struct vtimer_list *timer)
 {
+        struct vtimer_queue *vq;
         unsigned long flags;
-        __u64 done;
-        struct vtimer_list *event;
-        struct vtimer_queue *vt_list;
+        __u64 left, expires;
 
-        vt_list = &per_cpu(virt_cpu_timer, timer->cpu);
-        spin_lock_irqsave(&vt_list->lock, flags);
+        vq = &per_cpu(virt_cpu_timer, timer->cpu);
+        spin_lock_irqsave(&vq->lock, flags);
 
         BUG_ON(timer->cpu != smp_processor_id());
 
-        /* if list is empty we only have to set the timer */
-        if (list_empty(&vt_list->list)) {
-                /* reset the offset, this may happen if the last timer was
-                 * just deleted by mod_virt_timer and the interrupt
-                 * didn't happen until here
-                 */
-                vt_list->offset = 0;
-                goto fire;
+        if (list_empty(&vq->list)) {
+                /* First timer on this cpu, just program it. */
+                list_add(&timer->entry, &vq->list);
+                set_vtimer(timer->expires);
+                vq->timer = timer->expires;
+                vq->elapsed = 0;
+        } else {
+                /* Check progress of old timers. */
+                expires = timer->expires;
+                left = get_vtimer();
+                if (likely((s64) expires < (s64) left)) {
+                        /* The new timer expires before the current timer. */
+                        set_vtimer(expires);
+                        vq->elapsed += vq->timer - left;
+                        vq->timer = expires;
+                } else {
+                        vq->elapsed += vq->timer - left;
+                        vq->timer = left;
+                }
+                /* Insert new timer into per cpu list. */
+                timer->expires += vq->elapsed;
+                list_add_sorted(timer, &vq->list);
         }
 
-        /* save progress */
-        asm volatile ("STPT %0" : "=m" (done));
-
-        /* calculate completed work */
-        done = vt_list->to_expire - done + vt_list->offset;
-        vt_list->offset = 0;
-
-        list_for_each_entry(event, &vt_list->list, entry)
-                event->expires -= done;
-
- fire:
-        list_add_sorted(timer, &vt_list->list);
-
-        /* get first element, which is the next vtimer slice */
-        event = list_entry(vt_list->list.next, struct vtimer_list, entry);
-
-        set_vtimer(event->expires);
-        spin_unlock_irqrestore(&vt_list->lock, flags);
+        spin_unlock_irqrestore(&vq->lock, flags);
         /* release CPU acquired in prepare_vtimer or mod_virt_timer() */
         put_cpu();
 }
@@ -381,14 +429,15 @@ EXPORT_SYMBOL(add_virt_timer_periodic);
  * If we change a pending timer the function must be called on the CPU
  * where the timer is running on, e.g. by smp_call_function_single()
  *
- * The original mod_timer adds the timer if it is not pending. For compatibility
- * we do the same. The timer will be added on the current CPU as a oneshot timer.
+ * The original mod_timer adds the timer if it is not pending. For
+ * compatibility we do the same. The timer will be added on the current
+ * CPU as a oneshot timer.
  *
  * returns whether it has modified a pending timer (1) or not (0)
  */
 int mod_virt_timer(struct vtimer_list *timer, __u64 expires)
 {
-        struct vtimer_queue *vt_list;
+        struct vtimer_queue *vq;
         unsigned long flags;
         int cpu;
 
@@ -404,17 +453,17 @@ int mod_virt_timer(struct vtimer_list *timer, __u64 expires)
                 return 1;
 
         cpu = get_cpu();
-        vt_list = &per_cpu(virt_cpu_timer, cpu);
+        vq = &per_cpu(virt_cpu_timer, cpu);
 
         /* check if we run on the right CPU */
         BUG_ON(timer->cpu != cpu);
 
         /* disable interrupts before test if timer is pending */
-        spin_lock_irqsave(&vt_list->lock, flags);
+        spin_lock_irqsave(&vq->lock, flags);
 
         /* if timer isn't pending add it on the current CPU */
         if (!vtimer_pending(timer)) {
-                spin_unlock_irqrestore(&vt_list->lock, flags);
+                spin_unlock_irqrestore(&vq->lock, flags);
                 /* we do not activate an interval timer with mod_virt_timer */
                 timer->interval = 0;
                 timer->expires = expires;
@@ -431,7 +480,7 @@ int mod_virt_timer(struct vtimer_list *timer, __u64 expires)
                 timer->interval = expires;
 
         /* the timer can't expire anymore so we can release the lock */
-        spin_unlock_irqrestore(&vt_list->lock, flags);
+        spin_unlock_irqrestore(&vq->lock, flags);
         internal_add_vtimer(timer);
         return 1;
 }
@@ -445,25 +494,19 @@ EXPORT_SYMBOL(mod_virt_timer);
 int del_virt_timer(struct vtimer_list *timer)
 {
         unsigned long flags;
-        struct vtimer_queue *vt_list;
+        struct vtimer_queue *vq;
 
         /* check if timer is pending */
         if (!vtimer_pending(timer))
                 return 0;
 
-        vt_list = &per_cpu(virt_cpu_timer, timer->cpu);
-        spin_lock_irqsave(&vt_list->lock, flags);
+        vq = &per_cpu(virt_cpu_timer, timer->cpu);
+        spin_lock_irqsave(&vq->lock, flags);
 
         /* we don't interrupt a running timer, just let it expire! */
         list_del_init(&timer->entry);
 
-        /* last timer removed */
-        if (list_empty(&vt_list->list)) {
-                vt_list->to_expire = 0;
-                vt_list->offset = 0;
-        }
-
-        spin_unlock_irqrestore(&vt_list->lock, flags);
+        spin_unlock_irqrestore(&vq->lock, flags);
         return 1;
 }
 EXPORT_SYMBOL(del_virt_timer);
@@ -473,24 +516,19 @@ EXPORT_SYMBOL(del_virt_timer);
  */
 void init_cpu_vtimer(void)
 {
-        struct vtimer_queue *vt_list;
+        struct vtimer_queue *vq;
 
         /* kick the virtual timer */
-        S390_lowcore.exit_timer = VTIMER_MAX_SLICE;
-        S390_lowcore.last_update_timer = VTIMER_MAX_SLICE;
-        asm volatile ("SPT %0" : : "m" (S390_lowcore.last_update_timer));
         asm volatile ("STCK %0" : "=m" (S390_lowcore.last_update_clock));
+        asm volatile ("STPT %0" : "=m" (S390_lowcore.last_update_timer));
+
+        /* initialize per cpu vtimer structure */
+        vq = &__get_cpu_var(virt_cpu_timer);
+        INIT_LIST_HEAD(&vq->list);
+        spin_lock_init(&vq->lock);
 
         /* enable cpu timer interrupts */
         __ctl_set_bit(0,10);
-
-        vt_list = &__get_cpu_var(virt_cpu_timer);
-        INIT_LIST_HEAD(&vt_list->list);
-        spin_lock_init(&vt_list->lock);
-        vt_list->to_expire = 0;
-        vt_list->offset = 0;
-        vt_list->idle = 0;
-
 }
 
 void __init vtime_init(void)