fix cpufreq-ondemand by accounting skipped ticks as idle ticks [Was: [PATCH] i386 no idle HZ aka Dynticks 051203]

[Dominik Brodowski <linux@dominikbrodowski.net>]

Account ticks skipped dynamically as idle ticks.

This allows the ondemand cpufreq governor to work correctly with dyntick.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

Index: working-tree/arch/i386/kernel/dyn-tick.c
===================================================================
--- working-tree.orig/arch/i386/kernel/dyn-tick.c
+++ working-tree/arch/i386/kernel/dyn-tick.c
@@ -19,6 +19,7 @@
 #include <linux/dyn-tick.h>
 #include <linux/timer.h>
 #include <linux/irq.h>
+#include <linux/kernel_stat.h>
 #include <asm/apic.h>
 #include <asm/dyn-tick.h>
 
@@ -109,6 +110,8 @@ void dyn_tick_interrupt(struct pt_regs *
 			do_timer(regs);
 		if (cpu_has_local_apic())
 			enable_pit_timer();
+		if (lost)
+			kstat_cpu(cpu).cpustat.idle += (lost - 1);
 	}
 	cpu_clear(cpu, nohz_cpu_mask);
 	spin_unlock(&dyn_tick->lock);
-
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