Not yet upstream but planned to be so.

Index: xfsprogs-2.10.2/mkfs/xfs_mkfs.c
===================================================================
--- xfsprogs-2.10.2.orig/mkfs/xfs_mkfs.c
+++ xfsprogs-2.10.2/mkfs/xfs_mkfs.c
@@ -733,7 +733,7 @@ main(
 	nodsflag = norsflag = 0;
 	force_overwrite = 0;
 	worst_freelist = 0;
-	lazy_sb_counters = 0;
+	lazy_sb_counters = 1;
 	memset(&fsx, 0, sizeof(fsx));
 
 	memset(&xi, 0, sizeof(xi));
Index: xfsprogs-2.10.2/man/man8/mkfs.xfs.8
===================================================================
--- xfsprogs-2.10.2.orig/man/man8/mkfs.xfs.8
+++ xfsprogs-2.10.2/man/man8/mkfs.xfs.8
@@ -455,9 +455,10 @@ counter values without needed to keep th
 This gives significant improvements in performance on some configurations.
 The default
 .I value
-is 0 (off) so you must specify
-.B lazy-count=1
-if you want to make use of this feature.
+is 1 (on) so you must specify
+.B lazy-count=0
+if you want to disable this feature for older kernels which don't support
+it.
 .RE
 .TP
 .BI \-n " naming_options"