iommu/vt-d: Fix address shifting in page request handler

This really should be VTD_PAGE_SHIFT, not PAGE_SHIFT. Not that we ever
really anticipate seeing this used on IA64, but we should get it right
anyway.
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

drivers/iommu/intel-svm.c

@@ -490,7 +490,7 @@ static irqreturn_t prq_event_thread(int irq, void *d)
 		req = &iommu->prq[head / sizeof(*req)];
 
 		result = QI_RESP_FAILURE;
-		address = (u64)req->addr << PAGE_SHIFT;
+		address = (u64)req->addr << VTD_PAGE_SHIFT;
 		if (!req->pasid_present) {
 			pr_err("%s: Page request without PASID: %08llx %08llx\n",
 			       iommu->name, ((unsigned long long *)req)[0],