__val = __val < __min ? __min: __val; \
__val > __max ? __max: __val; })
+
+/*
+ * swap - swap value of @a and @b
+ */
+#define swap(a, b) \
+ do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
+
/**
* container_of - cast a member of a structure out to the containing structure
* @ptr: the pointer to the member.