[PATCH 1/5] hrtimer: splitout peek ahead functionality

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

[-- Attachment #1: hrtimers-splitout-peek-ahead-functionality.patch --]
[-- Type: text/plain, Size: 1385 bytes --]

From: Thomas Gleixner <tglx@linutronix.de>

Provide a peek ahead function that assumes irqs disabled, allows for micro
optimizations.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
 kernel/hrtimer.c |   24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

Index: linux-2.6-tip/kernel/hrtimer.c
===================================================================
--- linux-2.6-tip.orig/kernel/hrtimer.c
+++ linux-2.6-tip/kernel/hrtimer.c
@@ -1244,6 +1244,22 @@ void hrtimer_interrupt(struct clock_even
 	}
 }
 
+/*
+ * local version of hrtimer_peek_ahead_timers() called with interrupts
+ * disabled.
+ */
+static void __hrtimer_peek_ahead_timers(void)
+{
+	struct tick_device *td;
+
+	if (!hrtimer_hres_active())
+		return;
+
+	td = &__get_cpu_var(tick_cpu_device);
+	if (td && td->evtdev)
+		hrtimer_interrupt(td->evtdev);
+}
+
 /**
  * hrtimer_peek_ahead_timers -- run soft-expired timers now
  *
@@ -1255,16 +1271,10 @@ void hrtimer_interrupt(struct clock_even
  */
 void hrtimer_peek_ahead_timers(void)
 {
-	struct tick_device *td;
 	unsigned long flags;
 
-	if (!hrtimer_hres_active())
-		return;
-
 	local_irq_save(flags);
-	td = &__get_cpu_var(tick_cpu_device);
-	if (td && td->evtdev)
-		hrtimer_interrupt(td->evtdev);
+	__hrtimer_peek_ahead_timers();
 	local_irq_restore(flags);
 }
 

--