Hi NeilBrown, FYI, there are new compile warnings show up in tree: git://neil.brown.name/md for-next head: eef0978072c3b83c77a1215933be48a4d70b6206 commit: e0ee778528bbaad28a5c69d2e219269a3a096607 [2/11] md/raid10: fix problem with on-stack allocation of r10bio structure. config: s390-allmodconfig (attached as .config) All error/warnings: drivers/md/raid10.c: In function 'raid10_mergeable_bvec': drivers/md/raid10.c:708:1: warning: 'raid10_mergeable_bvec' uses dynamic stack allocation [enabled by default] drivers/md/raid10.c: In function 'raid10d': drivers/md/raid10.c:2725:1: warning: 'raid10d' uses dynamic stack allocation [enabled by default] vim +708 drivers/md/raid10.c 705 rcu_read_unlock(); 706 } 707 return max; > 708 } 709 710 /* 711 * This routine returns the disk from which the requested read should --- 0-DAY kernel build testing backend Open Source Technology Centre Fengguang Wu Intel Corporation