mem_range_attr_set undefined

I just upgraded from 5.2-RELEASE to 5.2-CURRENT as of Aug 9 and now the 
NVidia kernel module doesn't want to load.  I recompiled both my X 
server and the module itself, but every time I try to kldload it I get:

link_elf: symbol mem_range_attr_set undefined

What did I do wrong?  Thanks.