18 years ago · d802ab981d
--- a/Documentation/x86_64/boot-options.txt
+++ b/Documentation/x86_64/boot-options.txt
@@ -203,6 +203,7 @@ IOMMU
 
				 	    When off all DMA over >4GB is forced through an IOMMU or bounce
			
 
				 	    buffering.
			
 
				    nodac    Forbid DMA >4GB
			
 
				+   panic    Always panic when IOMMU overflows
			
 
				 
			
 
				   swiotlb=pages[,force]
			
 
				 
			
--- a/arch/x86_64/kernel/pci-dma.c
+++ b/arch/x86_64/kernel/pci-dma.c
@@ -245,6 +245,7 @@ EXPORT_SYMBOL(dma_set_mask);
 
				    noaperture Don't touch the aperture for AGP.
			
 
				    allowdac Allow DMA >4GB
			
 
				    nodac    Forbid DMA >4GB
			
 
				+   panic    Force panic when IOMMU overflows
			
 
				 */
			
 
				 __init int iommu_setup(char *p)
			
 
				 {