I tested this on one of my ZFS testing VMs ('ztest') and can confirm that zfs-dkms 0.8.1 compiles against 5.2.0-2-amd64 when the patch is applied to /var/lib/dkms/zfs/0.8.1/source/include/linux/simd_x86.h
ztest:~# dkms status zfs, 0.8.1, 4.19.0-3-amd64, x86_64: installed zfs, 0.8.1, 4.19.0-5-amd64, x86_64: installed zfs, 0.8.1, 5.2.0-2-amd64, x86_64: installed The VM reboots successfuly and the zfs pool is working normally: ztest:~# uname -a Linux ztest 5.2.0-2-amd64 #1 SMP Debian 5.2.7-1 (2019-08-07) x86_64 GNU/Linux ztest:~# zpool status pool: tank1 state: ONLINE scan: scrub repaired 0B in 0 days 00:00:02 with 0 errors on Sat Aug 10 13:47:04 2019 config: NAME STATE READ WRITE CKSUM tank1 ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 virtio-VD-0005 ONLINE 0 0 0 virtio-VD-0006 ONLINE 0 0 0 errors: No known data errors craig -- craig sanders <c...@taz.net.au>