powerpc/perf_event: Reduce latency of calling perf_event_do_pending

[pandora-kernel.git] / arch / powerpc / kernel / time.c

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index ce53dfa..8533b3b 100644 (file)
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -577,20 +577,11 @@ void timer_interrupt(struct pt_regs * regs)
         * some CPUs will continuue to take decrementer exceptions */
        set_dec(DECREMENTER_MAX);
 
-#ifdef CONFIG_PPC32
+#if defined(CONFIG_PPC32) && defined(CONFIG_PMAC)
        if (atomic_read(&ppc_n_lost_interrupts) != 0)
                do_IRQ(regs);
 #endif
 
-       now = get_tb_or_rtc();
-       if (now < decrementer->next_tb) {
-               /* not time for this event yet */
-               now = decrementer->next_tb - now;
-               if (now <= DECREMENTER_MAX)
-                       set_dec((int)now);
-               trace_timer_interrupt_exit(regs);
-               return;
-       }
        old_regs = set_irq_regs(regs);
        irq_enter();
 
@@ -606,8 +597,16 @@ void timer_interrupt(struct pt_regs * regs)
                get_lppaca()->int_dword.fields.decr_int = 0;
 #endif
 
-       if (evt->event_handler)
-               evt->event_handler(evt);
+       now = get_tb_or_rtc();
+       if (now >= decrementer->next_tb) {
+               decrementer->next_tb = ~(u64)0;
+               if (evt->event_handler)
+                       evt->event_handler(evt);
+       } else {
+               now = decrementer->next_tb - now;
+               if (now <= DECREMENTER_MAX)
+                       set_dec((int)now);
+       }
 
 #ifdef CONFIG_PPC_ISERIES
        if (firmware_has_feature(FW_FEATURE_ISERIES) && hvlpevent_is_pending())