The per-cpu trace_cpu_idle variable is used when timing *either*
IRQs-off or preempt sections.

---
 kernel/latency_trace.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Index: linux-2.6/kernel/latency_trace.c
===================================================================
--- linux-2.6.orig/kernel/latency_trace.c
+++ linux-2.6/kernel/latency_trace.c
@@ -85,9 +85,13 @@ static inline int DEBUG_WARN_ON(int cond
 }
 #endif
 
+#if defined(CONFIG_CRITICAL_IRQSOFF_TIMING) || \
+    defined(CONFIG_CRITICAL_PREEMPT_TIMING)
+   static DEFINE_PER_CPU(int, trace_cpu_idle);
+#endif
+
 #ifdef CONFIG_CRITICAL_IRQSOFF_TIMING
 # ifdef CONFIG_CRITICAL_PREEMPT_TIMING
-   static DEFINE_PER_CPU(int, trace_cpu_idle);
 #  define irqs_off_preempt_count() (preempt_count() && !__get_cpu_var(trace_cpu_idle))
 # else
 #  define irqs_off_preempt_count() 0

--
-
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