[mmotm and linux-next][PATCH] irq: enclose irq_desc_lock_class in CONFIG_LOCKDEP

[KOSAKI Motohiro]

Applied after: linux-next.patch

==
Subject: [mmotm][PATCH] irq: enclose irq_desc_lock_class in CONFIG_LOCKDEP

commit 08678b0841267c1d00d771fe01548d86043d065e introduced
irq_desc_lock_class variable.
But it is used only if CONFIG_LOCKDEP=Y.
otherwise, following warnings happend.

	  CC      kernel/irq/handle.o
	kernel/irq/handle.c:26: warning: 'irq_desc_lock_class' defined but not used


Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
CC: Yinghai Lu <yhlu.kernel@xxxxxxxxx>
CC: Ingo Molnar <mingo@xxxxxxx>
---
 kernel/irq/handle.c |    2 ++
 1 file changed, 2 insertions(+)

Index: b/kernel/irq/handle.c
===================================================================
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -20,10 +20,12 @@
 
 #include "internals.h"
 
+#ifdef CONFIG_LOCKDEP
 /*
  * lockdep: we want to handle all irq_desc locks as a single lock-class:
  */
 static struct lock_class_key irq_desc_lock_class;
+#endif
 
 /**
  * handle_bad_irq - handle spurious and unhandled irqs


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