bit_spinlock: add required includes

Nick Piggin · Nick Piggin · commit 626d60743561 · 2011-01-07T17:50:31.000+11:00
Signed-off-by: Nick Piggin &lt;npiggin@kernel.dk&gt;
diff --git a/include/linux/bit_spinlock.h b/include/linux/bit_spinlock.h
@@ -1,6 +1,10 @@
 #ifndef __LINUX_BIT_SPINLOCK_H
 #define __LINUX_BIT_SPINLOCK_H
 
+#include <linux/kernel.h>
+#include <linux/preempt.h>
+#include <asm/atomic.h>
+
 /*
  *  bit-based spin_lock()
  *
