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-rw-r--r--include/linux/spinlock_up.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/spinlock_up.h b/include/linux/spinlock_up.h
index b14f6a91e19f..a26e2fb604e6 100644
--- a/include/linux/spinlock_up.h
+++ b/include/linux/spinlock_up.h
@@ -5,6 +5,8 @@
# error "please don't include this file directly"
#endif
+#include <asm/processor.h> /* for cpu_relax() */
+
/*
* include/linux/spinlock_up.h - UP-debug version of spinlocks.
*
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