From: Andrew Morton <akpm@osdl.org>

for cpu_relax().

Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 include/asm-x86_64/spinlock.h |    1 +
 1 file changed, 1 insertion(+)

diff -puN include/asm-x86_64/spinlock.h~fix-x86_64-mm-spinlock-cleanup include/asm-x86_64/spinlock.h
--- a/include/asm-x86_64/spinlock.h~fix-x86_64-mm-spinlock-cleanup
+++ a/include/asm-x86_64/spinlock.h
@@ -4,6 +4,7 @@
 #include <asm/atomic.h>
 #include <asm/rwlock.h>
 #include <asm/page.h>
+#include <asm/processor.h>
 
 /*
  * Your basic SMP spinlocks, allowing only a single CPU anywhere
_