Dan Williams <[email protected]> writes: > 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 provider is present. > > Cc: Paul Mackerras <[email protected]> > Cc: Michael Ellerman <[email protected]> > Cc: Martin Schwidefsky <[email protected]> > Cc: Heiko Carstens <[email protected]> > Cc: Gerald Schaefer <[email protected]> > Cc: Benjamin Herrenschmidt <[email protected]> > Cc: Mike Snitzer <[email protected]> > Cc: Bart Van Assche <[email protected]> > Signed-off-by: Dan Williams <[email protected]> > --- > arch/powerpc/platforms/Kconfig | 1 + > drivers/block/Kconfig | 1 + > drivers/dax/Kconfig | 4 +++- > drivers/nvdimm/Kconfig | 1 + > drivers/s390/block/Kconfig | 1 + > 5 files changed, 7 insertions(+), 1 deletion(-) > > diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig > index 4fd64d3f5c44..4561340c1f92 100644 > --- a/arch/powerpc/platforms/Kconfig > +++ b/arch/powerpc/platforms/Kconfig > @@ -296,6 +296,7 @@ config AXON_RAM > tristate "Axon DDR2 memory device driver" > depends on PPC_IBM_CELL_BLADE && BLOCK > select DAX > + select DAX_DRIVER
I would have thought you'd want to replace the select of DAX with a select of DAX_DRIVER? With the driver selecting both there's no need for the core to select DAX, because all the DAX drivers have done it already. cheers
