Index: kernel/arch/amd64/include/atomic.h
===================================================================
--- kernel/arch/amd64/include/atomic.h	(revision 2bcf6c654972c91913e02276dd74d51eb9229589)
+++ kernel/arch/amd64/include/atomic.h	(revision 5e5cef3b7bf7f9684a41a5a30a8d2022b309efd7)
@@ -141,5 +141,5 @@
 
 
-#define _atomic_cas_ptr_impl(pptr, exp_val, new_val, old_val, prefix)
+#define _atomic_cas_ptr_impl(pptr, exp_val, new_val, old_val, prefix) \
 	asm volatile ( \
 		prefix " cmpxchgq %[newval], %[ptr]\n" \