diff -ru usr/src/nv/nv-vm.c usr/src/nv.1321905/nv-vm.c
--- usr/src/nv/nv-vm.c	2005-03-22 16:19:09.000000000 +0100
+++ usr/src/nv.1321905/nv-vm.c	2005-10-23 15:43:12.860170440 +0200
@@ -248,6 +248,20 @@
         /* lock the page for dma purposes */
         SetPageReserved(NV_GET_PAGE_STRUCT(phys_addr));
 
+#if defined(_PAGE_NX)
+        if ((_PAGE_NX & pgprot_val(PAGE_KERNEL)) != 0 && phys_addr < 0x400000) {
+            // Until a bug in change_page_attr() is fixed
+            // we avoid pages with physaddr < 0x400000,
+            // since splitting "jumbo" mappings results
+            // in kernel pages being mapped as PAGE_KERNEL, which
+            // may include _PAGE_NX, effectively making much of the
+            // kernel code non-executable.
+            nv_printf(NV_DBG_MEMINFO, "NVRM: nv_vm_malloc discarding page @%08x\n", phys_addr);
+            --i;
+            continue;
+        }
+#endif
+
         page_ptr = at->page_table[i];
         page_ptr->phys_addr = phys_addr;
         page_ptr->virt_addr = virt_addr;