Hi, LTP tests on DAX show 2 issues. msync03 and diotest4, both xfs and ext4, non-DAX pass DAX fail 1, MAP_LOCKED && msync with MS_INVALIDATE, which should fail. Flag checking code in msync looks ok but missing _LOCK vma falgs for DAX mapped vma ? i guess DAX now does not support that ? Tracking by LTP testcase "msync03" 2. O_DIRECT rw odd counts on DAX read/write 1 byte on file opened with O_DIRECT, EINVAL is expected but Success. I'm not sure whether this is an issue, please enlighten :) Tracking by LTP testcase "dio04 diotest4". BTW, I am testing DAX with xfstests, LTP and other fs test cases. If the same case fails on DAX but pass on non-DAX, i'll look into and report if it is a real issue to me. I've been doing this for a while, recently, I started looking at cases that fail on non-DAX and pass on DAX inspired by Darrick in another thread. For now, test result looks good. Except the above 2 issues which I've seen for a while and not sure they are really issues, xfstests check -g auto has no major regressions between DAX and non-DAX. generic/403 is a new case and its failures are under investigation, i'll report if it is. Thanks, Xiong