On Mon, Apr 11 2016 at 11:14am -0400,
Sudip Mukherjee [off-list ref] wrote:

We can use kvfree() instead of calling kfree() and vfree() based on
if-else and param_flags. kvfree() will check the type of address and
will call the respective function to free it.
Additionally we can also remove the use of DM_PARAMS_KMALLOC and
DM_PARAMS_VMALLOC.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>

Have you actually tested htis?  Last time I looked to do this it exposed
crashes.  I don't have time to dig into this again right now but this is
_not_ as simple as this patch implies.