diff --git a/[refs] b/[refs]
index eda38bdfafa4..45ecbc46753a 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 355540f3338e1408dac98413f05d612a76d4f5e3
+refs/heads/master: 65f87d8a8a6e1b560c61951d0a68ed80f7c8ff19
diff --git a/trunk/arch/x86_64/kernel/pci-swiotlb.c b/trunk/arch/x86_64/kernel/pci-swiotlb.c
index ebdb77fe2057..6a55f87ba97f 100644
--- a/trunk/arch/x86_64/kernel/pci-swiotlb.c
+++ b/trunk/arch/x86_64/kernel/pci-swiotlb.c
@@ -31,9 +31,10 @@ struct dma_mapping_ops swiotlb_dma_ops = {
 void pci_swiotlb_init(void)
 {
 	/* don't initialize swiotlb if iommu=off (no_iommu=1) */
-	if (!iommu_detected && !no_iommu &&
-	    (end_pfn > MAX_DMA32_PFN || force_iommu))
+	if (!iommu_detected && !no_iommu && end_pfn > MAX_DMA32_PFN)
 	       swiotlb = 1;
+	if (swiotlb_force)
+		swiotlb = 1;
 	if (swiotlb) {
 		printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
 		swiotlb_init();
diff --git a/trunk/include/asm-x86_64/swiotlb.h b/trunk/include/asm-x86_64/swiotlb.h
index 5f9a01805821..ba94ab3d2673 100644
--- a/trunk/include/asm-x86_64/swiotlb.h
+++ b/trunk/include/asm-x86_64/swiotlb.h
@@ -42,6 +42,8 @@ extern void swiotlb_free_coherent (struct device *hwdev, size_t size,
 extern int swiotlb_dma_supported(struct device *hwdev, u64 mask);
 extern void swiotlb_init(void);
 
+extern int swiotlb_force;
+
 #ifdef CONFIG_SWIOTLB
 extern int swiotlb;
 #else