diff --git a/arch/parisc/include/uapi/asm/pdc.h b/arch/parisc/include/uapi/asm/pdc.h
index cefdda9..fef4f2e 100644
--- a/arch/parisc/include/uapi/asm/pdc.h
+++ b/arch/parisc/include/uapi/asm/pdc.h
@@ -472,6 +472,7 @@ struct pdc_model {		/* for PDC_MODEL */
 	unsigned long arch_rev;
 	unsigned long pot_key;
 	unsigned long curr_key;
+	unsigned long width;	/* default of PSW_W bit (1=enabled) */
 };
 
 struct pdc_cache_cf {		/* for PDC_CACHE  (I/D-caches) */