arch/arm: Document the clever trick of PRI?32 macros
* Pre-processor Prototypes
****************************************************************************/
+/* The below definition convert __INT32_TYPE__ from 'int'/'signed int' or
+ * 'long int'/signed long int' to '+2'/'+0 +2' or '+4 +2'/'+0 +4 +2', and
+ * then make the expression of '__INT32_TYPE__ == int' valid.
+ */
+
#define signed +0
-#define unsigned +0
#define int +2
#define long +4
