diff -Napur -X /home/jbarnes/dontdiff linux-2.6.11/include/asm-ia64/io.h linux-2.6.11-pio/include/asm-ia64/io.h
--- linux-2.6.11/include/asm-ia64/io.h	2005-03-01 23:38:34.000000000 -0800
+++ linux-2.6.11-pio/include/asm-ia64/io.h	2005-04-18 09:05:02.000000000 -0700
@@ -349,24 +349,28 @@ static inline void
 __writeb (unsigned char val, volatile void __iomem *addr)
 {
 	*(volatile unsigned char __force *) addr = val;
+	mmiowb();
 }
 
 static inline void
 __writew (unsigned short val, volatile void __iomem *addr)
 {
 	*(volatile unsigned short __force *) addr = val;
+	mmiowb();
 }
 
 static inline void
 __writel (unsigned int val, volatile void __iomem *addr)
 {
 	*(volatile unsigned int __force *) addr = val;
+	mmiowb();
 }
 
 static inline void
 __writeq (unsigned long val, volatile void __iomem *addr)
 {
 	*(volatile unsigned long __force *) addr = val;
+	mmiowb();
 }
 
 #define __readb		platform_readb