[PATCH v8 08/18] dax: introduce CONFIG_DAX_DRIVER

2018-03-30 Thread Dan Williams
In support of allowing device-mapper to compile out idle/dead code when there are no dax providers in the system, introduce the DAX_DRIVER symbol. This is selected by all leaf drivers that device-mapper might be layered on top. This allows device-mapper to conditionally 'select DAX' only when a

[PATCH v8 08/18] dax: introduce CONFIG_DAX_DRIVER

2018-03-30 Thread Dan Williams
In support of allowing device-mapper to compile out idle/dead code when there are no dax providers in the system, introduce the DAX_DRIVER symbol. This is selected by all leaf drivers that device-mapper might be layered on top. This allows device-mapper to conditionally 'select DAX' only when a