Index: linux-2.6/include/linux/scatterlist.h
===================================================================
--- linux-2.6.orig/include/linux/scatterlist.h	2007-06-27 17:00:19.000000000 -0700
+++ linux-2.6/include/linux/scatterlist.h	2007-06-27 17:02:13.000000000 -0700
@@ -16,6 +16,15 @@
 static inline void sg_init_one(struct scatterlist *sg, const void *buf,
 			       unsigned int buflen)
 {
+	/*
+	 * Putting slab objects onto a scatter gather
+	 * list could be problematic.
+	 *
+	 * If a temporary buffer is needed then a page
+	 * should be allocated and not a kmalloc
+	 * entity.
+	 */
+	WARN_ON_ONCE(PageSlab(virt_to_page(buf)));
 	memset(sg, 0, sizeof(*sg));
 	sg_set_buf(sg, buf, buflen);
 }