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-rw-r--r--unmodified_drivers/linux-2.6/compat-include/xen/platform-compat.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/unmodified_drivers/linux-2.6/compat-include/xen/platform-compat.h b/unmodified_drivers/linux-2.6/compat-include/xen/platform-compat.h
index eceac2a4ff..fd696704ee 100644
--- a/unmodified_drivers/linux-2.6/compat-include/xen/platform-compat.h
+++ b/unmodified_drivers/linux-2.6/compat-include/xen/platform-compat.h
@@ -157,4 +157,8 @@ typedef irqreturn_t (*irq_handler_t)(int, void *, struct pt_regs *);
#define setup_xen_features xen_setup_features
#endif
+#ifndef atomic_cmpxchg
+#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), (old), (new)))
+#endif
+
#endif