[patch-rt 2/4] ftrace: fix erroneous histogram stop WARN_ON() messages

[Thomas Gleixner]

IRQs are temporarily disabled during histogram calculation in
cycles_2_ns(). This causes a nested irqs_off histogram processing
which emittes an erroneous WARN_ON() message and also confuses the
histogramm output.

Change local_irq to raw_local_irq in cycles_2_ns to prevent irqs_off
histogram processing.

Tested-by: Carsten Emde <C.Emde@xxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

---
 include/asm-x86/timer.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: linux-2.6.26/include/asm-x86/timer.h
===================================================================
--- linux-2.6.26.orig/include/asm-x86/timer.h
+++ linux-2.6.26/include/asm-x86/timer.h
@@ -53,9 +53,9 @@ static inline notrace unsigned long long
 	unsigned long long ns;
 	unsigned long flags;
 
-	local_irq_save(flags);
+	raw_local_irq_save(flags);
 	ns = __cycles_2_ns(cyc);
-	local_irq_restore(flags);
+	raw_local_irq_restore(flags);
 
 	return ns;
 }

-- 

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