[PATCH] hardirq uses preempt

hardirq.h uses preempt_count() from preempt.h
Signed-off-by: NRandy Dunlap <rdunlap@xenotime.net>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

include/linux/hardirq.h

@@ -2,6 +2,7 @@
 #define LINUX_HARDIRQ_H
 
 #include <linux/config.h>
+#include <linux/preempt.h>
 #include <linux/smp_lock.h>
 #include <asm/hardirq.h>
 #include <asm/system.h>