Impact: compile fix

In order to compile a kernel with performance counter patches,
<asm/irq_regs.h> has to be included to provide the declaration of
struct pt_regs *get_irq_regs(void);

Signed-off-by: Tim Blechmann <tim@klingt.org>
---
 kernel/perf_counter.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index d6cc222..0018c5e 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -24,6 +24,8 @@
 #include <linux/vmstat.h>
 #include <linux/rculist.h>
 
+#include <asm/irq_regs.h>
+
 /*
  * Each CPU has a list of per CPU counters:
  */
-- 
1.6.2