diff --git a/kernel-xenlinux.spec b/kernel-xenlinux.spec
index 906cc07..fd0bf3b 100644
--- a/kernel-xenlinux.spec
+++ b/kernel-xenlinux.spec
@@ -224,6 +224,49 @@ cp vmlinux %buildroot%{debuginfodir}/lib/modules/%kernelrelease
 
 find %buildroot/lib/modules/%kernelrelease -name "*.ko" -type f >modnames
 
+# mark modules executable so that strip-to-file can strip them
+xargs --no-run-if-empty chmod u+x < modnames
+
+# Generate a list of modules for block and networking.
+
+fgrep /drivers/ modnames | xargs --no-run-if-empty nm -upA |
+sed -n 's,^.*/\([^/]*\.ko\):  *U \(.*\)$,\1 \2,p' > drivers.undef
+
+collect_modules_list()
+{
+  sed -r -n -e "s/^([^ ]+) \\.?($2)\$/\\1/p" drivers.undef |
+  LC_ALL=C sort -u > %buildroot/lib/modules/%kernelrelease/modules.$1
+}
+
+collect_modules_list networking \
+			 'register_netdev|ieee80211_register_hw|usbnet_probe'
+collect_modules_list block \
+			 'ata_scsi_ioctl|scsi_add_host|scsi_add_host_with_dma|blk_init_queue|register_mtd_blktrans|scsi_esp_register|scsi_register_device_handler'
+collect_modules_list drm \
+			 'drm_open|drm_init'
+collect_modules_list modesetting \
+			 'drm_crtc_init'
+
+# detect missing or incorrect license tags
+rm -f modinfo
+while read i
+do
+  echo -n "${i#%buildroot/lib/modules/%kernelrelease/} " >> modinfo
+  /sbin/modinfo -l $i >> modinfo
+done < modnames
+
+egrep -v \
+	  'GPL( v2)?$|Dual BSD/GPL$|Dual MPL/GPL$|GPL and additional rights$' \
+	  modinfo && exit 1
+
+rm -f modinfo modnames
+
+# remove files that will be auto generated by depmod at rpm -i time
+for i in alias alias.bin ccwmap dep dep.bin ieee1394map inputmap isapnpmap ofmap pcimap seriomap symbols symbols.bin usbmap
+do
+  rm -f %buildroot/lib/modules/%kernelrelease/modules.$i
+done
+
 # Move the devel headers out of the root file system
 mkdir -p %buildroot/usr/src/kernels
 mv %buildroot/lib/modules/%kernelrelease/build/* %buildroot/%src_install_dir