Say M if unsure
+config DEV_DAX_KMEM
+ tristate "KMEM DAX: volatile-use of persistent memory"
+ default DEV_DAX
+ depends on DEV_DAX
+ depends on MEMORY_HOTPLUG # for add_memory() and friends
+ help
+ Support access to persistent memory as if it were RAM. This
+ allows easier use of persistent memory by unmodified
+ applications.
+
+ To use this feature, a DAX device must be unbound from the
+ device_dax driver (PMEM DAX) and bound to this kmem driver
+ on each boot.
+
+ Say N if unsure.
+
config DEV_DAX_PMEM_COMPAT
tristate "PMEM DAX: support the deprecated /sys/class/dax interface"
depends on DEV_DAX_PMEM