Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6

[linux-2.6-omap-h63xx.git] / arch / powerpc / kernel / time.c

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 9eb3284deac4e5d4e9942b5e643ab59fede4af85..a925a8eae121e1946c8d39959775b4b07de1c561 100644 (file)
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -241,8 +241,9 @@ void account_system_vtime(struct task_struct *tsk)
                /* deltascaled includes both user and system time.
                 * Hence scale it based on the purr ratio to estimate
                 * the system time */
-               deltascaled = deltascaled * get_paca()->system_time /
-                       (get_paca()->system_time + get_paca()->user_time);
+               if (get_paca()->user_time)
+                       deltascaled = deltascaled * get_paca()->system_time /
+                            (get_paca()->system_time + get_paca()->user_time);
                delta += get_paca()->system_time;
                get_paca()->system_time = 0;
        }
@@ -259,7 +260,7 @@ void account_system_vtime(struct task_struct *tsk)
  * user and system time records.
  * Must be called with interrupts disabled.
  */
-void account_process_vtime(struct task_struct *tsk)
+void account_process_tick(struct task_struct *tsk, int user_tick)
 {
        cputime_t utime, utimescaled;
 
@@ -274,18 +275,6 @@ void account_process_vtime(struct task_struct *tsk)
        account_user_time_scaled(tsk, utimescaled);
 }
 
-static void account_process_time(struct pt_regs *regs)
-{
-       int cpu = smp_processor_id();
-
-       account_process_vtime(current);
-       run_local_timers();
-       if (rcu_pending(cpu))
-               rcu_check_callbacks(cpu, user_mode(regs));
-       scheduler_tick();
-       run_posix_cpu_timers(current);
-}
-
 /*
  * Stuff for accounting stolen time.
  */
@@ -375,7 +364,6 @@ static void snapshot_purr(void)
 
 #else /* ! CONFIG_VIRT_CPU_ACCOUNTING */
 #define calc_cputime_factors()
-#define account_process_time(regs)     update_process_times(user_mode(regs))
 #define calculate_steal_time()         do { } while (0)
 #endif
 
@@ -586,7 +574,7 @@ void timer_interrupt(struct pt_regs * regs)
                /* not time for this event yet */
                now = per_cpu(decrementer_next_tb, cpu) - now;
                if (now <= DECREMENTER_MAX)
-                       set_dec((unsigned int)now - 1);
+                       set_dec((int)now);
                return;
        }
        old_regs = set_irq_regs(regs);
@@ -599,20 +587,8 @@ void timer_interrupt(struct pt_regs * regs)
                get_lppaca()->int_dword.fields.decr_int = 0;
 #endif
 
-       /*
-        * We cannot disable the decrementer, so in the period
-        * between this cpu's being marked offline in cpu_online_map
-        * and calling stop-self, it is taking timer interrupts.
-        * Avoid calling into the scheduler rebalancing code if this
-        * is the case.
-        */
-       if (!cpu_is_offline(cpu))
-               account_process_time(regs);
-
        if (evt->event_handler)
                evt->event_handler(evt);
-       else
-               evt->set_next_event(DECREMENTER_MAX, evt);
 
 #ifdef CONFIG_PPC_ISERIES
        if (firmware_has_feature(FW_FEATURE_ISERIES) && hvlpevent_is_pending())
@@ -836,9 +812,6 @@ static int decrementer_set_next_event(unsigned long evt,
                                      struct clock_event_device *dev)
 {
        __get_cpu_var(decrementer_next_tb) = get_tb_or_rtc() + evt;
-       /* The decrementer interrupts on the 0 -> -1 transition */
-       if (evt)
-               --evt;
        set_dec(evt);
        return 0;
 }
@@ -857,7 +830,7 @@ static void register_decrementer_clockevent(int cpu)
        *dec = decrementer_clockevent;
        dec->cpumask = cpumask_of_cpu(cpu);
 
-       printk(KERN_INFO "clockevent: %s mult[%lx] shift[%d] cpu[%d]\n",
+       printk(KERN_DEBUG "clockevent: %s mult[%lx] shift[%d] cpu[%d]\n",
               dec->name, dec->mult, dec->shift, cpu);
 
        clockevents_register_device(dec);
@@ -871,7 +844,8 @@ void init_decrementer_clockevent(void)
                                             decrementer_clockevent.shift);
        decrementer_clockevent.max_delta_ns =
                clockevent_delta2ns(DECREMENTER_MAX, &decrementer_clockevent);
-       decrementer_clockevent.min_delta_ns = 1000;
+       decrementer_clockevent.min_delta_ns =
+               clockevent_delta2ns(2, &decrementer_clockevent);
 
        register_decrementer_clockevent(cpu);
 }