drivers/parisc/iommu-helpers.h:62: error: implicit declaration of function 'prefetchw'
make[3]: *** [drivers/parisc/sba_iommu.o] Error 1

drivers/parisc/iommu-helpers.h needs to #include <linux/prefetch.h>
where prefetchw is declared.
Signed-off-by: NWANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>