From: Avi Kivity <[EMAIL PROTECTED]>
Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
diff --git a/kernel/external-module-compat.h b/kernel/external-module-compat.h
index ea94f30..1dc5a96 100644
--- a/kernel/external-module-compat.h
+++ b/kernel/external-module-compat.h
@@ -322,6 +322,28 @@ static inline void __kvm_set_64bit(u64 *ptr, u64 val)
#undef set_64bit
#define set_64bit __kvm_set_64bit
+static inline unsigned long long __kvm_cmpxchg64(volatile void *ptr,
+ unsigned long long old,
+ unsigned long long new)
+{
+ unsigned long long prev;
+ __asm__ __volatile__(LOCK_PREFIX "cmpxchg8b %3"
+ : "=A"(prev)
+ : "b"((unsigned long)new),
+ "c"((unsigned long)(new >> 32)),
+ "m"(*__xg(ptr)),
+ "0"(old)
+ : "memory");
+ return prev;
+}
+
+#define kvm_cmpxchg64(ptr,o,n)\
+ ((__typeof__(*(ptr)))__kvm_cmpxchg64((ptr),(unsigned long long)(o),\
+ (unsigned long long)(n)))
+
+#undef cmpxchg64
+#define cmpxchg64(ptr, o, n) kvm_cmpxchg64(ptr, o, n)
+
#endif
#ifndef CONFIG_PREEMPT_NOTIFIERS
-------------------------------------------------------------------------
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