+#define CMM_ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
+
+#ifndef caa_max
+#define caa_max(a,b) ((a)>(b)?(a):(b))
+#endif
+
+#ifndef caa_min
+#define caa_min(a,b) ((a)<(b)?(a):(b))
+#endif
+
+#if defined(__SIZEOF_LONG__)
+#define CAA_BITS_PER_LONG (__SIZEOF_LONG__ * 8)
+#elif defined(_LP64)
+#define CAA_BITS_PER_LONG 64
+#else
+#define CAA_BITS_PER_LONG 32
+#endif
+
+/*
+ * caa_container_of - Get the address of an object containing a field.
+ *
+ * @ptr: pointer to the field.
+ * @type: type of the object.
+ * @member: name of the field within the object.
+ */
+#define caa_container_of(ptr, type, member) \
+ ({ \
+ const typeof(((type *) NULL)->member) * __ptr = (ptr); \
+ (type *)((char *)__ptr - offsetof(type, member)); \
+ })
+
+#define CAA_BUILD_BUG_ON_ZERO(cond) (sizeof(struct { int:-!!(cond); }))
+#define CAA_BUILD_BUG_ON(cond) ((void)BUILD_BUG_ON_ZERO(cond))