===== arch/ppc/config.in 1.195 vs edited =====
--- 1.195/arch/ppc/config.in	Tue Jul  8 11:13:46 2003
+++ edited/arch/ppc/config.in	Fri Jul 18 00:50:50 2003
@@ -730,6 +730,7 @@
   bool '  Memory mapped I/O debugging' CONFIG_DEBUG_IOVIRT
   bool '  Spinlock debugging' CONFIG_DEBUG_SPINLOCK
   bool '  Wait queue debugging' CONFIG_DEBUG_WAITQ
+  bool '  Check for unaligned buffers in consistent_sync' CONFIG_DEBUG_CONSISTENT_SYNC  
   bool '  Include kgdb kernel debugger' CONFIG_KGDB
   if [ "$CONFIG_KGDB" = "y" ]; then
     choice '    Serial Port'		\
===== arch/ppc/mm/cachemap.c 1.13 vs edited =====
--- 1.13/arch/ppc/mm/cachemap.c	Thu Feb 27 11:40:16 2003
+++ edited/arch/ppc/mm/cachemap.c	Fri Jul 18 00:52:05 2003
@@ -150,6 +150,19 @@
 	case PCI_DMA_NONE:
 		BUG();
 	case PCI_DMA_FROMDEVICE:	/* invalidate only */
+
+#ifdef CONFIG_DEBUG_CONSISTENT_SYNC
+		if (unlikely(start & (L1_CACHE_LINE_SIZE - 1)) || 
+		    unlikely(end & (L1_CACHE_LINE_SIZE - 1)))
+		{
+			static unsigned int count = 0;
+			if (++count < 10)
+				printk(KERN_WARNING
+				    "consistent_sync: 0x%08lx-0x%08lx "
+				    "is not properly aligned, lr 0x%p\n", 
+				    start, end, __builtin_return_address(0));
+		}        
+#endif
 		invalidate_dcache_range(start, end);
 		break;
 	case PCI_DMA_TODEVICE:		/* writeback only */