--- zzzz-none-000/linux-3.10.107/lib/raid6/mmx.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/lib/raid6/mmx.c	2021-02-04 17:41:59.000000000 +0000
@@ -76,6 +76,7 @@
 
 const struct raid6_calls raid6_mmxx1 = {
 	raid6_mmx1_gen_syndrome,
+	NULL,			/* XOR not yet implemented */
 	raid6_have_mmx,
 	"mmxx1",
 	0
@@ -134,6 +135,7 @@
 
 const struct raid6_calls raid6_mmxx2 = {
 	raid6_mmx2_gen_syndrome,
+	NULL,			/* XOR not yet implemented */
 	raid6_have_mmx,
 	"mmxx2",
 	0