--- zfs-0.7.1/config/kernel-vfs-rw-iterate.m4	2017-08-08 22:58:21.000000000 +0000
+++ zfs-0.7.1.new/config/kernel-vfs-rw-iterate.m4	2017-09-24 07:22:03.762421822 +0000
@@ -37,6 +37,7 @@
 		#include <linux/fs.h>
 	],[
 		new_sync_read(NULL, NULL, 0, NULL);
+		new_sync_write(NULL, NULL, 0, NULL);
 	],[
 		AC_MSG_RESULT(yes)
 		AC_DEFINE(HAVE_NEW_SYNC_READ, 1,