diff -Nur linux-4.14.39.orig/arch/microblaze/kernel/syscall_table.S linux-4.14.39/arch/microblaze/kernel/syscall_table.S
--- linux-4.14.39.orig/arch/microblaze/kernel/syscall_table.S	2018-05-01 21:58:27.000000000 +0200
+++ linux-4.14.39/arch/microblaze/kernel/syscall_table.S	2018-05-06 21:16:14.830349827 +0200
@@ -187,7 +187,7 @@
 	.long sys_getcwd
 	.long sys_capget
 	.long sys_capset		/* 185 */
-	.long sys_ni_syscall		/* sigaltstack */
+	.long sys_sigaltstack
 	.long sys_sendfile
 	.long sys_ni_syscall		/* reserved for streams1 */
 	.long sys_ni_syscall		/* reserved for streams2 */