[dm-devel] can't boot with linux-next-20160104

[Jeff Moyer]

Hi,

commit ead3db62bf10f (dm ioctl: do not directly deference user memory in
check_version()) causes my machine not to boot.  I get errors like the
following and then get dumped into a recovery shell:
  device-mapper: version ioctl on  failed: Bad address
  Incompatible libdevmapper (unknown version) and kernel driver (unknown version).

Reverting the above patch fixes the issue for me.

Cheers,
Jeff